The Routing module implements the Network Routing layer described by the
Digital Network Architecture.
The entities that constitute the ROUTING module are listed below. The
indention indicates the hierarchical relationships between the entities.
Routing
Destination area
Destination node
IP destination address
Port
Permitted neighbor
EGP group
EGP neighbor
Circuit
Adjacency
IP address translation
IP adjacency
IP reachable address
Reachable address
The Routing module routes messages in the network and manages the message
packet flow. The Routing module components provide the following functions:
o Routing determines packet paths. A path is the sequence of connected
nodes and links between a source node and a destination node. The combined
knowledge of all the network Routing layer modules of all the nodes in a
network is used to determine the existence of a path, and route the packet
to its destination. The routing component at a routing node has the
following specific functions:
- Extracts and interprets the route header in a packet.
- Performs packet forwarding based on the destination address.
- Performs packet fragmentation where necessary.
- Manages the characteristics of the path and if a node or link fails on
a path, finds an alternate route.
- Interfaces with the Network Routing Subnetwork Dependent sublayer to
receive reports concerning a circuit or node that has failed or the
subsequent recovery of a circuit or node.
- Performs packet reassembly at the destination.
- Returns error reports to the source where necessary, for instance when
the destination is unreachable or when the packet would have needed to
be fragmented but segmentation permitted was not set in the packet.
Segmentation permitted is always set in data packets generated by DNA
nodes. However, non-DNA nodes may do otherwise.
o Congestion control manages the resources used at each packet switching
node each node that permits route-through.
o Packet lifetime control bounds the amount of time a packet can exist in
the network.
o Initialization identifies the adjacent node and the adjacent node's
network routing layer. It also performs node verification, if required.
o Dynamic circuit management -- determines when to dial calls, when to hang
up calls, and on dynamically assigned circuits which DTE address to dial.
It exists only on dynamically established data links.
Whether or not a particular attribute or event of a routing module entity is
supported often depends on the type of node on which the routing module is
operating. The description of an attribute or event indicates the type of
node for which the attribute or event is supported, using the following key:
L1 - The attribute is supported only for Level 1 routers.
L2 - The attribute is supported only for Level 2 routers.
L1,L2 - The attribute is supported only for Level 1 or Level 2 routers.
End - The attribute is supported only for end nodes.
IP - The attribute is supported only for systems that support dual Routing
that is, both OSI and IP routing.
All - The attribute is supported by all implementations.
The routing entity is the top-level entity in the Routing module hierarchy
of entities. The Routing module controls the operation of network routing
within a node.
1 – CHARACTER
AREA AUTHENTICATION TYPE
Support: L1,IP
Default: None Value: None or Simple
Type of authentication to be used for level 1 LSPs, PSNPs, and CSNPs.
AUTONOMOUS SYSTEM NUMBER
Support: IP
Default: 0 Value: 1-65535
Autonomous system number of the local system. This characteristic is
supported only if the value of the routing protocols supported
characteristic includes EGP. You can modify this characteristic only
when the status attribute routing state is off.
DNA ADDRESS FORMAT
Support: End
Default: True Value: Boolean
If true, specifies that NSAP addresses are DNA structured, and that
NSAP address autoconfiguring is possible. If false, this specifies
that NSAP addresses for this node are constructed from the
characteristic manual network entity titles and the selectors
supplied by the transport protocol module NSP and/or OSI transport.
DOMAIN AUTHENTICATION TYPE
Support: L2,IP
Default: None Value: None or simple
Type of authentication to be used for level 2 LSPs, PSNPs, and CSNPs.
GENERATE CHECKSUMS
Support: All
Default: False Value: Boolean
If true, specifies that checksums are generated for data, error
report, and ES-IS PDUs initiated by this node. If false, these
checksums are not generated. It is strongly recommended that, for
performance reasons, you use the default value indicating no checksum
generation.
IP REASSEMBLY TIME
Support: IP
Default: 10 Value: 1-255
Maximum time, in seconds, for which IP fragments are held while
awaiting reassembly.
LIFETIME
Support: All
Default: 63 Value: 2-255
Value to be placed in the <quote>lifetime field of originating data
packets. This value should be greater than the maximum number of hops
in any path in the network, plus the maximum packet lifetime in
half-seconds.
MANUAL AREA ADDRESSES
Support: L1,L2
Default: No area address Value: Set of area addresses
Area addresses to be used for this node. An area address cannot be a
Phase IV address or the address DefaultArea. If the characteristic
manual L1 algorithm has the value routing vector, this set must
be empty, and the characteristic phaseiv address must not be 0.0. If
the characteristic phaseiv address is 0.0, there must be at least one
area address.
MANUAL L1 ALGORITHM
Support: L1
Default: Routing Vector Value: see below
Type of routing algorithm to be used within the area. You can modify
this characteristic only when the entity is disabled.
link state - The DECnet-Plus link-state algorithm is used.
routing vector - The Phase IV routing-vector algorithm is used.
MANUAL L2 ALGORITHM
Support: L2
Default: Routing Vector Value: see below
Type of routing algorithm to be used at level 2. You can modify this
characteristic only when the entity is disabled.
LINK STATE - The DECnet-Plus link-state algorithm is used.
ROUTING VECTOR - The Phase IV routing-vector algorithm is used.
MANUAL NETWORK ENTITY TITLES
Support: End
Default: No NETS Value: set of NETS
Network entity titles NETs to be used for this node. If the
characteristic dna address format is set to false, there must be
at least one NET.
MAXIMUM BUFFERS
Default: 100 Value: 1-65535
Specifies the guaranteed number of buffers for forwarding. More
buffers may be used if they are available. You can only increase the
characteristic value.
MAXIMUM PATH SPLITS
Support: L1,L2
Default: 2 Value: 1-32
Maximum number of equal cost paths to split traffic between. You can
modify this characteristic only when the entity is disabled.
MINIMUM LSP TRANSMISSION INTERVAL
Support: L1,L2
Specifies the minimum interval in seconds between transmissions of
an LSP from a particular source. When changed the timer must be reset.
PHASEIV ADDRESS
Support: All
Default 0.0 Value: Phase IV address
Specifies a Phase IV compatible address for communication with other
Phase IV nodes. The default address, 0.0, indicates that no Phase IV
compatible address is provided for the node. You can modify this
characteristic only when the entity is disabled.
PHASEIV AREA MAXIMUM COST
Support: L2
Default: 1022 Value: 1-1022
Maximum cost of a path to a reachable Phase IV area. This
characteristic is only used by the Phase IV routing algorithm that is,
the routing-vector algorithm.
PHASEIV AREA MAXIMUM HOPS
Support: L2
Default: 30 Value: 1-30
Maximum number of hops in a path to a reachable Phase IV area. This
characteristic is only used by the Phase IV routing algorithm that
is, the routing-vector algorithm.
PHASEIV BROADCAST ROUTING TIMER
Support: L1,L2
Default: 10 Value: 1-65535
Maximum interval, in seconds, between broadcast routing messages on
broadcast circuits. This characteristic is only used by the Phase IV
routing algorithm that is, the routing-vector algorithm.
PHASEIV BUFFER SIZE
Support: All
Default: 576 Value: 1-65535
Size, in octets, of buffers used for routing to adjacent Phase IV
nodes. This value is actually six octets greater than the maximum
buffer size, and does not include the headers for the Routing and
Data Link layers.
PHASEIV MAXIMUM ADDRESS
Support: L1,L2
Default: 1023 Value: 1-1023
Maximum node number within the Phase IV area. This characteristic is
only used by the Phase IV routing algorithm that is, the
routing-vector algorithm.
PHASEIV MAXIMUM AREA
Support: L2
Default: 63 Value: 1-63
Maximum Phase IV area number. This characteristic is only used by the
Phase IV routing algorithm that is, the routing-vector algorithm.
PHASEIV MAXIMUM COST
Support: L1,L2
Default: 1022 Value: 1-1022
Maximum cost of a path to a reachable node within the Phase IV area.
This characteristic is only used by the Phase IV routing algorithm
that is, the routing-vector algorithm.
PHASEIV MAXIMUM HOPS
Support: L1,L2
Default: 30 Value: 1-30
Maximum number of hops in a path to a reachable node within the Phase
IV area. This characteristic is only used by the Phase IV routing
algorithm that is, the routing-vector algorithm.
PHASEIV MAXIMUM VISITS
Support: All
Default: 63 Value: 1-63
Maximum number of visits that a packet can make to this node before
Routing assumes that the packet is looping. This characteristic is only
used by the Phase IV routing algorithm that is, the routing-vector
algorithm.
PHASEIV PREFIX
Support: All
Default: Hex 49 Value: address prefix
Prefix for Phase IV addresses. If the characteristic phaseiv address
is not 0.0, a DECnet-Plus area address is formed by adding the area
portion of the Phase IV address to this prefix. You can modify this
characteristic only when the entity is disabled.
PROBE RATE
Support: End
Default: 20 Value: 1-65535
Number of packets after which a probe is sent. This characteristic is
used only on multilink end systems, on circuits without cache entries
for the destination.
PROTOCOLS
Support: IP
Default: Value: IP or ISO8473
The protocol stacks that are enabled on this system. These can be
either or both of the above values. The value of this characteristic
derives from an argument to the create command. You cannot modify
this characteristic.
REDIRECT HOLDING TIME
Support: L1,L2
Default: 600 Value: 1-65535
Holding time, in seconds, to be specified in Redirect PDUs generated
by this node.
RIP RECEIVE METRIC CLASS
Support: L2,IP
Default: External Value: External or Internal
The class to be associated with routes received through RIP. This
value may be overridden by a routing receive route entity. This
characteristic is supported only if the routing protocols supported
characteristic includes the RIP routing protocol.
RIP SEND LOCAL METRIC
Support: L2,IP
Default: 1 Value: 0-16
The metric value used by RIP when announcing routes derived from local
information. This value is used unless it is overridden by a routing
send route entity. This characteristic is supported only if the
routing protocols supported characteristic includes the RIP routing
protocol.
RIP SEND METRIC CLASSES
Support: L2,IP
Default: Internal Value: set of external, internal
Routes received through routing protocols other than RIP with metric
classes in this set are candidates for announcement in RIP messages
subject to the route propagation policy in force. Routes with metric
classes not in this set will not be announced. Each value in this set
may be overridden separately by a more specific propagation policy
specified by a routing send route or routing send route route
source entity. This characteristic is supported only if the routing
protocols supported characteristic includes the RIP routing protocol.
RIP SEND REPLACEMENT METRIC
Support: L2,IP
Default: 1 Value: 0-16
The metric value used by RIP when announcing routes derived through
other routing protocols. This value is used unless it is overridden by
a routing send route entity. This characteristic is supported only
if the routing protocols supported characteristic includes the RIP
routing protocol.
ROUTE PROPAGATION
Support: L2,IP
Default: No Route Propagation Value: set of protocol pairs
The default route propagation to be performed. The set may include
the following protocol pairs:
EGP to IS-IS IS-IS to RIP
EGP to RIP RIP to EGP
IS-IS to EGP
If a particular value is not present in the set, routes are not
propagated between those two protocols in that direction. This
characteristic is supported only if the routing protocols supported
characteristic includes either of the EGP or RIP routing protocols.
ROUTING PROTOCOLS SUPPORTED
Support: L2,IP
The set of routing protocols supported by this implementation. You
cannot modify this characteristic.
EGP
IS-IS
RIP
SEGMENT BUFFER SIZE
Support: All
Default: 570 Value: 0-65535
Maximum segment size, in octets, to be used by the Transport layer. A
value of zero means that the segment size is unlimited.
SEND SOURCE QUENCH
Support: L1,L2,IP
Default: False Value: Boolean
Specifies whether an ICMP source quench packet is sent when an IP
packet is discarded because of congestion. If false, ICMP source
quench packets are never sent.
SOURCE QUENCH INTERVAL
Support: L1,L2,IP
Default: 100 Value: 1-65535
Minimum time, in milliseconds, between transmission of successive
ICMP source quench packets.
SUMMARY ADDRESSES
Support: L2,IP
Default: No address Value: Set of summary addresses
Summary address information to be included in level 2 link state
packets sent by this node.
TIME TO LIVE
Support: IP
Default: 35 Value: 1-255
Specifies the value to be placed in the time to live field of
originating IP packets. This value should be greater than the maximum
number of hops in any path on the network.
TYPE
Support: All
Default: No default Value: see below
Routing type of this node. You cannot modify this characteristic.
ENDNODE - The node is an end node.
L1router - The node is a level 1 router.
L2router - The node is a level 2 router.
VERSION
Version number of the DNA Network Routing layer architecture
specification to which this implementation conforms. You cannot modify
this characteristic.
2 – counters
ADDRESS UNREACHABLE PDUS DISCARDED
Support: All
Number of data PDUs that have been discarded because the destination
was unreachable.
AGED IP PACKETS DISCARDED
Support: IP
Number of IP packets that have been discarded because their time of
life has expired.
AGED PDUS DISCARDED
Support: L1,L2
Number of data PDUs that have been discarded because their lifetime
has expired.
ATTEMPTS TO EXCEED MAXIMUM SEQUENCE NUMBER
Support: L1,L2
Number of times an attempt was made to increase the sequence number of
a link state packet beyond the maximum allowed.
CORRUPTED LSPS DETECTED
Support: L1,L2
Number of times that the corrupted lsp detected event has been
generated.
ERROR REPORTS GENERATED
Support: All
Number of error report PDUs or Phase IV data packets with RTS set
that have been generated.
ICMP ADDRESS MASK REPLY MESSAGES RECEIVED
Support: IP
Number of ICMP Address Mask Reply messages received.
ICMP ADDRESS MASK REPLY MESSAGES SENT
Support: IP
Number of ICMP Address Mask Reply messages sent.
ICMP ADDRESS MASK REQUEST MESSAGES RECEIVED
Support: IP
Number of ICMP Address Mask Request messages received.
ICMP ADDRESS MASK REQUEST MESSAGES SENT
Support: IP
Number of ICMP Address Mask Request messages sent.
ICMP DESTINATION UNREACHABLE MESSAGES RECEIVED
Support: IP
Number of ICMP Destination Unreachable messages received.
ICMP DESTINATION UNREACHABLE MESSAGES SENT
Support: IP
Number of ICMP Destination Unreachable messages sent.
ICMP ECHO REPLY MESSAGES RECEIVED
Support: IP
Number of ICMP Echo Reply messages received.
ICMP ECHO REPLY MESSAGES SENT
Support: IP
Number of ICMP Echo Reply messages sent.
ICMP ECHO REQUEST MESSAGES RECEIVED
Support: IP
Number of ICMP Echo Request messages received.
ICMP ECHO REQUEST MESSAGES SENT
Support: IP
Number of ICMP Echo Request messages sent.
ICMP MESSAGE SEND ERRORS
Support: IP
Number of ICMP messages that could not be sent because of problems in
the ICMP layer. Note that this value does not include errors that
occur outside the ICMP layer, such as forwarding errors.
ICMP MESSAGES RECEIVED
Support: IP
Number of ICMP messages received. This value includes those messages
counted by the icmp received message errors counter.
ICMP MESSAGES SENT
Support: IP
Number of ICMP messages of all types that the node has attempted to
send. Note that this figure includes the value of the icmp message
send errors counter.
ICMP PARAMETER PROBLEM MESSAGES RECEIVED
Support: IP
Number of ICMP Parameter Problem messages received.
ICMP PARAMETER PROBLEM MESSAGES SENT
Support: IP
Number of ICMP Parameter Problem messages sent.
ICMP RECEIVED MESSAGE ERRORS
Support: IP
Number of ICMP messages received with any type of error.
ICMP REDIRECT MESSAGES RECEIVED
Support: IP
Number of ICMP Redirect messages received.
ICMP REDIRECT MESSAGES SENT
Support: IP
Number of ICMP Redirect messages sent.
ICMP SOURCE QUENCH MESSAGES RECEIVED
Support: IP
Number of ICMP Source Quench messages received.
ICMP SOURCE QUENCH MESSAGES SENT
Support: IP
Number of ICMP Source Quench messages sent.
ICMP TIME EXCEEDED MESSAGES RECEIVED
Support: IP
Number of ICMP Time Exceeded messages received.
ICMP TIME EXCEEDED MESSAGES SENT
Support: IP
Number of ICMP Time Exceeded messages sent.
ICMP TIMESTAMP REPLY MESSAGES RECEIVED
Support: IP
Number of ICMP Timestamp Reply messages received.
ICMP TIMESTAMP REPLY MESSAGES SENT
Support: IP
Number of ICMP Timestamp Reply messages sent.
ICMP TIMESTAMP REQUEST MESSAGES RECEIVED
Support: IP
Number of ICMP Timestamp Request messages received.
ICMP TIMESTAMP REQUEST MESSAGES SENT
Support: IP
Number of ICMP Timestamp Request messages sent.
ICMP UNKNOWN MESSAGE TYPES RECEIVED
Support: IP
Number of ICMP messages received with an unknown message type.
IP ADDRESS UNREACHABLE PACKETS DISCARDED
Support: IP
Number of IP packets discarded because their destination was
unreachable.
IP DESTINATION ADDRESS ERROR PACKETS DISCARDED
Support: IP
Number of IP packets discarded because of an invalid destination
address or the address of an unsupported class.
IP PACKET FORMAT ERRORS
Support: IP
Number of IP packets discarded because of a format error in the IP
header.
IP PACKETS DISCARDED
Support: IP
Number of IP packets discarded for either of the following reasons:
o Error in the IP header, such as bad checksum or version number
mismatch. Note, however, that format errors and time to live expired
are excluded.
o Packet received through data link broadcast when forwarding is not
allowed.
IP PROTOCOL UNREACHABLE PACKETS DISCARDED
Support: IP
Number of IP packets received for the local system and discarded
because there was no port with the protocol type specified in the IP
datagram PROTO field.
IP SOURCE ADDRESS ERROR PACKETS DISCARDED
Support: IP
Number of IP packets discarded because of an invalid source address or
the address of an unsupported class.
LSP l1 DATABASE OVERLOADS
Support: L1,L2
Number of times that the lsp level 1 database overload event has
been generated.
LSP l2 DATABASE OVERLOADS
Support: L2
Number of times that the lsp level 2 database overload event has
been generated.
MANUAL ADDRESSES DROPPED FROM AREA
Support: L1,L2
Number of times an address in the manual area addresses set is
ignored when computing an area address. Each address that is ignored
is counted separately.
OWN LSP PURGES
Support: L1,L2
Number of times that the own lsp purged event has been generated.
PDU FORMAT ERRORS
Support: All
Number of data PDUs that have been discarded because of format errors.
PHASEIV TRANSLATION FAILURES
Support: All
Number of times the phaseiv translation failures event has been
generated.
SEQUENCE NUMBER SKIPS
Support: L1,L2
Number of times that the sequence number skipped event has been
generated.
UNSUPPORTED OPTIONS
Support: All
Number of data PDUs that have been discarded because they specified
unsupported options in their header.
3 – preset_attrib
Preset attributes are similar to characteristics, in that their values
control the way in which the routing module operates. However, unlike
characteristics, you cannot alter preset attribute values using the set
command.
BROADCAST LSP TRANSMISSION INTERVAL
Support: L1,L2
Interval, in milliseconds, between the transmission of Link State
Packets LSPs on a broadcast circuit.
COMPLETE SNP INTERVAL
Support: L1,L2
Interval, in seconds, between generation of Complete Sequence Number
Packets SNPs by a designated router on a broadcast circuit.
DEFAULT ESHELLO TIMER
Support: All
Value to be used for the current suggested Hello timer, in the absence
of any suggested value from the intermediate system IS. On routers,
this is the value to be suggested when the router is not required to
poll the ES configuration. In routers, this value is suggested by the
Suggested ES Configuration Timer option in IS Hellos.
DR ISISHELLO TIMER
Support: L1,L2
Interval, in seconds, between the generation of IS-IS Hello PDUs by
the designated router.
ES CACHE HOLDING TIME
Support: End
Holding time, in seconds, for an entry in the node's end-node cache
database.
ES CACHE WIDTH
Support: End
Maximum number of LAN address entries in the node's end-node cache
database on a broadcast circuit.
HOLDING MULTIPLIER
Support: All
Value by which to multiply the Hello timer to obtain the holding timer
value for ES and IS Hellos and for point-to-point, router-to-router
Hellos.
INACTIVE SELECTOR
Support: All
This is the selector value identifying the port to which incoming
Inactive Subset PDUs are to be sent.
INITIALIZATION TIMER
Support: All
Delay, in seconds, between initialization of a data link and sending a
DECnet-Plus message on a DDCMP circuit.
ISIS FORMAT
Support: L1,L2
This attribute controls the protocol identification to be used for
"DNA Private" PDUs. On broadcast circuits, this characteristic also
controls the SAP on which they are transmitted.
ISIS HOLDING MULTIPLIER
Support: L1,L2
Value by which to multiply the ISIS Hello timer to obtain the value of
the holding timer for LAN level 1 and level 2 router-to-router Hellos.
MAXIMUM AGE
Support: L1,L2
Number of seconds before an LSP is considered to be expired.
MAXIMUM LSP GENERATION INTERVAL
Support: L1,L2
Maximum interval, in seconds, between link state packets LSPs
generated by this node.
MINIMUM LSP GENERATION INTERVAL
Support: L1,L2
Minimum time, in seconds, between generation of LSPs by this node.
MINIMUM LSP TRANSMISSION INTERVAL
Support: L1,L2
Minimum interval, in seconds, between retransmissions of an LSP.
MULTICIRCUIT ESHELLO TIMER
Support: End
Value to be used for the current suggested Hello timer on a
multicircuit end node with more than one circuit enabled, in the
absence of any suggested values from the IS.
ORIGINATING l1 LSP BUFFER SIZE
Support: L1,L2
Maximum size of level 1 LSPs and SNPs originated at this node.
ORIGINATING l2 LSP BUFFER SIZE
Support: L2
Maximum size of level 2 LSPs and SNPs originated at this node.
PARTIAL SNP INTERVAL
Support: L1,L2
Minimum interval, in seconds, between sending partial SNPs.
POLL ESHELLO RATE
Support: All
Interval, in seconds, between ES Hellos when a router requires to poll
the ES configuration.
QUEUE THRESHOLD
Support: L1,L2
Average queue length at a router, above which the "congestion
experienced" bit will be set in a forwarded data PDU.
WAITING TIME
Support: L1,L2
Delay, in seconds, between routing databases being in the waiting
state and entering the on state.
ZERO AGE LIFETIME
Support: L1,L2
Time, in seconds, for which the purge header of an expired LSP is
retained.
4 – status
AREA ADDRESSES
Support: All
A set of area addresses. If the node is an end node, these are the
area address portions of the NETs of all adjacent routers. If the
node is a level 1 or level 2 router, this set is the union of the
sets of manual area addresses reported in all level 1 LSPs received by
this router.
EGP PORT
Support: IP
Name of the routing port entity used for sending and receiving EGP
messages. This attribute is set when a routing egp group entity is
enabled.
ICMP PORT
Support: IP
Name of the routing port entity used for sending and receiving ICMP
messages. This attribute is set when the routing module is enabled
and the protocols characteristic includes the value IP.
L1 STATE
Support: L1,L2
State of the level 1 database.
OFF - Routing is disabled.
ON - Routing is enabled and operating correctly.
WAITING - Routing has received routing information that it cannot
store and is waiting for the overload to be removed.
L2 STATE
Support: L2
State of the level 2 database.
OFF - Routing is disabled.
ON - Routing is enabled and operating correctly.
WAITING - Routing has received routing information that it cannot
store and is waiting for the overload to be removed.
NEAREST L2 ROUTER ADJACENCIES
Support: L1,L2
Names of adjacencies to be used for forwarding to the nearest level 2
router. If the node is a level 2 router adjacent to other areas, or
if it is a level 1 router in an area with no attached level 2 routers,
this set is empty.
RIP PORT
Support: IP
Name of the udp port entity used by the routing module for sending
and receiving RIP messages. This attribute is set when a routing
circuit entity is enabled with its rip state characteristic set to
any value other than off.
STATE
Support: All
State of the routing entity.
OFF - The entity is disabled.
ON - The entity is enabled.
5 – circuit
A routing circuit entity represents a data link to another node.
5.1 – character
ALTERNATIVE SUBNET ADDRESSES
Support: L1,L2,IP
Default: No Address Value: Set of subnet_address
A set of alternative IP addresses and subnet masks for this interface.
You can modify this characteristic only when the entity is disabled.
ARP HOLDING TIME
Support: IP
Default: 600 Value: 30-65535
Number of seconds to hold on to a routing circuit ip address
translation entity. This characteristic is supported only if the
circuit's type characteristic is CSMA-CD.
ARP RESPONSE WAITING TIME
Support: IP
Default: 3 Value: 1-10
Number of seconds to wait for an ARP response when an ARP request has
been sent. This characteristic is supported only if the circuit's
type characteristic is CSMA-CD.
AUTHENTICATION TYPE
Support: L1,L2,IP
Default: None Value: None or Simple
Type of authentication to be used for LAN L1 Hellos, LAN L2 Hellos,
or PtPt Hellos on this circuit.
DATA LINK ENTITY
Support: All
Default: NO Data Link name Value: Local_entity-name
Name of the entity within the data link module to be created when a
port is opened for that data link type. You can modify this
characteristic only when the entity is disabled. This attribute is
supported for all types of circuits; however, for X.25 circuits set
the attribute to x25 access.
DIRECTED BROADCAST
Support: L1,IP
Default: On Value: Off or On
Specifies how an IP packet is to be forwarded on a broadcast link.
OFF - Discard the packet silently.
ON - Broadcast the packet using data level link broa that either of
the following conditions is true:
o The packet's subnet address matches the value of the subnet
address characteristic.
o The packet's subnet address matches one of the values of the
alternative subnet addresses characteristic.
This characteristic is supported only if the characteristic type is
set to CSMA-CD.
DNA NEIGHBOR
Support: L1,L2
Default: True Value: Boolean
If true, specifies that the neighbor is expected to be DNA
compliant, and so proprietary mechanisms are possible. If false, no
router-to-router Hellos or LSPs will be sent over this circuit. This
characteristic is supported only if the characteristic type is not
x25 da. You can modify this characteristic only when the entity is
disabled.
ENABLE PHASEIV ADDRESS
Support: All
Default: True Value: Boolean
Specifies whether the physical LAN address is to be set to the Phase IV
style LAN address that is, AA-00-04-00-xx-xx. The LAN address is
set only if this attribute is true and the value of the phaseiv
address characteristic is not 0.0. If phaseiv address is not 0.0
and there are multiple adaptors to the same LAN, only one circuit may
have this attribute set to true. This characteristic is supported
only if the characteristic type is set to CSMA-CD.
EXPLICIT RECEIVE VERIFICATION
Support: All
Default: True Value: Boolean
Type of password verification performed at circuit initialization. If
true, the received verifier is checked against the value of the
characteristic receive verifier for this circuit, if any. If false,
the received verifier is checked against the set of verifiers specified
in the routing permitted neighbor entities. This attribute is
supported only if the characteristic type is set to ddcmp, hdlc,
x25 static incoming, x25 static outgoing, and x25 permanent.
HELLO TIMER
Support: L1,L2
Default: 10 Value: 1-32767
Interval, in seconds, between IS Hello messages.
IDLE TIMER
Support: All
Default: 10 Value: 1-32767
Number of seconds of idle time before a call is cleared. This attribute
is supported only if the characteristic type is x25 da.
INACTIVE AREA ADDRESS
Support: All
Default: No area Address Value: Set of area address
Area address associated with the use of the inactive subnet of ISO
8473. Maximum area address that may be present is 1. This
characterisitic is supported only if the characteristic type is set
to csma-cd.
INITIAL MINIMUM TIMER
Support: All
Default: 55 Value: 1-65535
Period, in seconds, for which an X.25 call remains connected after
being established, irrespective of traffic. This should be set small
enough that the call is cleared before the start of the next charging
interval. This attribute is supported only if the characteristic type
is x25 da.
ISIS HELLO TIMER
Support: L1,L2
Default: 3 Value: 1-32767
Interval, in seconds, between LAN level 1 and level 2 router-to-router
Hello messages. This value is also used as the interval between IS
Hello messages when polling the ES configuration.
L1 COST
Support: L1,L2
Default: 20 Value: 1-63
Cost of this circuit for level 1 traffic.
L1 router priority
Support: L1,L2
Default: 64 Value: 1-127
Priority for becoming LAN level 1 designated router. This attribute is
supported only if the circuit's characteristic type is csma-cd.
L2 cost
Support: L2
Default: 20 Value: 1-63
Cost of this circuit for level 2 traffic.
L2 router priority
Support: L2
Default: 64 Value: 1-127
Priority for becoming LAN level 2 designated router. This attribute is
supported only if the circuit's characteristic type is csma-cd.
MANUAL DATA LINK SDU SIZE
Support: All
Default: 1492 Value: 128-65535
Preferred maximum data-link block size, in octets. You can modify this
characteristic only when the entity is disabled. If the characteristic
type is CSMA-CD, this characteristic is a read-only attribute whose
value is fixed at 1492.
MANUAL DATA LINK SDU SIZE FOR IP
Support: IP
Default: see below Value: 128-65535
Preferred maximum DSDU size, in octets, for the transmission of IP
packets. The DSDU size includes the size of the packet containing the
IP header. On point-to-point HDLC links, the DSDU size also includes
the 1-octet link encapsulation that is, the maximum IP packet size is
the value of this attribute minus 1. The default value depends on the
circuit type, as follows:
CSMA-CD - 1500
DDCMP - 1500
HDLC - 1500
X.25 all types - 576
You can modify this characteristic only when the entity is disabled.
MANUAL l2ONLY MODE
Support: L2
Default: False Value: Boolean
If true, specifies that this circuit is to be used only for level 2
traffic. If false, the circuit may be used for both level 1 and
level 2 traffic. You can modify this characteristic only when the
entity is disabled.
MANUAL ROUTERS
Support: End
Default: No router IDs Value: Set of LAN Address
Manually entered IDs of routers. If this set is empty, the circuit
will auto-configure the routers. This characteristic is supported only
if the circuit's characteristic type is CSMA-CD.
MAXIMUM ARP RETRIES
Support: IP
Default: 3 Value: 1-10
Maximum number of times that an ARP request can be sent for the same
IP address. This characteristic is supported only if the circuit's
characteristic type is set to CSMA-CD.
MAXIMUM CALL ATTEMPTS
Support: All
Default: 10 Value: 0-255
Maximum number of successive X.25 call failures before the circuit is
regarded as being halted. A value of zero means that there is no limit
to the number of retries. This attribute is supported only if the
characteristic type is set to x25 static outgoing. You can modify
this characteristic only when the entity is disabled. Also, you can
only increase the characteristic value.
MAXIMUM SVC ADJACENCIES
Support: All
Default: 1 Value: 1-65535
Number of routing circuit adjacency entities to reserve for SVCs on
this circuit. This is effectively the maximum number of simultaneous
calls possible on this circuit. This attribute is supported only if
the characteristic type is X25 DA.
ORIGINATING QUEUE LIMIT
Support: L1,L2
Default: 2 Value: 1-50
Maximum number of data PDUs originated by this node that can be on this
circuit's transmit queue. This should be set to the minimum number
required to keep the data link from idling. You can modify this
characteristic to a higher value when the entity is disabled; you can
never modify it to a lower value.
RECALL TIMER
Support: All
Default: 60 Value: 0-65535
Interval, in seconds, that must elapse between a call failure and a
recall. This attribute is supported only if the characteristic type
is set to X25 static outgoing, X25 DA, HDLC, or DDCMP.
RESERVE TIMER
Support: All
Default: 600 Value: 1-65535
Interval, in seconds, during which the SVC remains reserved for the
previous DTE address after a call is cleared due to lack of traffic.
This attribute is supported only if the characteristic type is
x25 da.
RESERVED ADJACENCY
Support: End
Default: False Value: Boolean
If true, specifies that one SVC must be reserved for connection to a
router. If false, no SVC needs to be reserved for this purpose. This
characteristic is supported only if the circuit's characteristic
type is x25 da. You can modify this characteristic only when the
entity is disabled.
RIP GENERATED DEFAULT ROUTE
Support: L1,L2,IP
Default: False Value Boolean
If true, this specifies that the default route is announced in RIP
messages sent on this circuit, with the metric value specified in the
RIP generated default route metric characteristic. If false, the
default route is not generated.
RIP GENERATED DEFAULT ROUTE METRIC
Support: L1,L2,IP
Default: False Value: Boolean
The metric to be used when announcing a generated default route through
RIP on this circuit.
RIP NEIGHBORS
Support: L2,IP
Default: No address Value: set of IP-addresses
IP addresses of neighboring systems with which RIP will be exchanged
on this circuit. If the circuit is a point-to-point circuit, this set
must contain a single IP address if the rip state characteristic is
to be set to send and receive. Also, you must disable the entity
before altering this characteristic. If the rip send type
characteristic is set to broadcast, only RIP messages from addresses
specified in this set will be received; other messages will be silently
discarded. This characteristic is supported only if the routing
protocols supported characteristic of the routing entity includes
the RIP routing protocol.
RIP POISONED REVERSE
Support: L2,IP
Default: True Value: Boolean
Specifies whether poisoned reverse routes are to be sent in RIP
messages on this circuit. If false, poisoned reverse routes are not
sent. This characteristic is supported only if the routing protocols
supported characteristic of the routing entity includes the RIP
routing protocol.
RIP RECEIVE DEFAULT ROUTE
Support: L2,IP
Default: True Value: Boolean
Specifies whether the default route is accepted from RIP messages on
this circuit. If false, the default route from RIP messages on this
circuit is discarded. This characteristic is supported only if the
routing protocols supported characteristic of the routing entity
includes the RIP routing protocol.
RIP SEND TYPE
Support: L2,IP
Default: Broadcast Value: Broadcast or point-to-point
Specifies how RIP messages are sent on this circuit.
BROADCAST - RIP messages are sent by means of data link broadcast.
POINT-TO-POINT - RIP messages are sent directly to each IP address
specified in the rip neighbors characteristic.
This characteristic is supported only if the routing protocols
supported characteristic of the routing entity includes the RIP
routing protocol and if the circuit's type characteristic is csma-cd.
RIP STATE
Support: L2,IP
Default: Off Value: see below
Specifies how RIP messages are treated on this circuit.
OFF - RIP messages cannot be sent or received on this
circuit.
RECEIVE - RIP messages can be received but not sent on this
circuit.
SEND AND RECEIVE - RIP messages can be sent and received on this
circuit.
This characteristic is supported only if the routing protocols
supported characteristic of the routing entity includes the RIP
routing protocol.
SUBNET ADDRESS
Support: IP
Default: 0.0.0.0 Value: Subnet Address
IP address and subnet mask of this interface. You can modify this
characteristic only when the entity is disabled.
TEMPLATE
Support: All
Default: No template name Value: Template-id
Name of the template to be used when a port is opened for this
data-link type. If no template name is specified, no template is used.
You can modify this characteristic only when the entity is disabled.
TRANSMIT VERIFIER
Support: All
Default: No verifier Value: Hex-string, length 0-38
Value to be transmitted for verifying the identity of this node. If
no verifier is specified, no verifier is transmitted. This
characteristic is supported only if the characteristic type is
either ddcmp, hdlc, x25 static outgoing, x25 static incoming, or
x25 permanent. You cannot display this characteristic.
TYPE
Support: All
Default: All
Type of circuit. You cannot modify this characteristic. This
characteristic is set by means of an argument to the create command.
CSMA-CD - The circuit is a broadcast circuit.
DDCMP - The circuit is a DDCMP circuit.
HDLC - The circuit is an HDLC circuit.
X25 DA - The circuit is a dynamically allocated X.25
circuit.
X25 PERMANENT - X.25 permanent virtual circuit.
X25 STATIC INCOMING - Static incoming X.25 circuit.
X25 STATIC OUTGOING - Static outgoing X.25 circuit.
X.25 FILTERS
Default: seee below Value: set of simple names
Specifies the set of X.25 filters to be used when a port is opened to
the X.25 module. Typically, there will be two sets: one to specify the
selection on the Call User Data field for DECnet-Plus, and the other to
specify the selection on the subaddress for Phase IV. This attribute is
valid only if the characteristic type is x25 static incoming or x25
da.
5.2 – counters
AUTHENTICATION FAILURES
Support: L1,L2,IP
Number of times a PDU has been received on this circuit with an
Authentication Information field that is incompatible with the PDU type.
CALLS FAILED
Support: All
Number of unsuccessful call attempts on this circuit. This attribute is
supported only if the characteristic type is x25 da.
CALLS PLACED
Support: All
Number of call attempts successful and unsuccessful on this circuit.
This attribute is supported only if the characteristic type is
x25 da.
CHANGES IN ADJACENCY STATE
Support: All
Number of times the status attribute state of an adjacency belonging
to this circuit changes from Up to Down or Initializing, or the
reverse.
CHANGES IN IP ADJACENCY STATE
Support: IP
Number of times the status attribute state of an IP adjacency
belonging to this circuit changes from Up to some other state, or the
reverse.
CHANGES IN RIP NEIGHBOR STATE
Support: L2,IP
Number of times the RIP state of IP adjacencies belonging to this
circuit have changed. This attribute is supported only if the routing
entity's characteristic routing protocols supported includes the
routing protocol RIP.
CIRCUIT CHANGES
Support: All
Number of times that the status attribute state has changed from on
to off, or vice versa.
CONGESTION DISCARDS
Support: L1,L2
Number of data-and error-report NPDUs that have been discarded, before
or after fragmentation, because of congestion. Any other discarding
will already have been done by the forwarding process. This number
includes all PDUs recognized by the receive process as data PDUs
DECnet-Plus data- and error-report PDUs and Phase IV data packets,
even though they may subsequently be discarded for some reason.
CONTROL PDUS RECEIVED
Support: All
Number of control PDUs that have been received on this circuit. This
number includes all Network layer PDUs, with the exception of
DECnet-Plus data and error report PDUs and Phase IV data PDUs.
CONTROL PDUS SENT
Support: All
Number of control PDUs that have been sent on this circuit.
CORRUPTED HELLO PDUS RECEIVED
Support: All
Number of times an ES-IS end system to intermediate system or IS-IS
intermediate system to intermediate system Hello PDU has been
received on this circuit that either cannot be parsed or contains an
incorrect checksum.
CORRUPTED LSPS RECEIVED
Support: L1,L2
Number of times a corrupted link state packet has been received on this
circuit.
DA ADJACENCY CHANGES
Support: All
Number of DA adjacency change events that have been generated.
DATA PDUS FORWARDED
Support: L1,L2
Number of data- and error-report NPDUs that have been forwarded onto
this circuit either from another circuit or from a local port. This
number includes all PDUs recognized by the receive process as data
PDUs DECnet-Plus data- and error-report PDUs and Phase IV data packets,
even though they may subsequently be discarded for some reason.
DATA PDUS FRAGMENTED
Support: All
Number of data NPDUs that have been fragmented on this circuit.
DATA PDUS RECEIVED
Support: All
Number of data- and error-report NPDUs that have been received on this
circuit. This number includes all PDUs recognized by the receive
process as data PDUs DECnet-Plus data and error report PDUs and Phase
IV data packets, even though they may subsequently be discarded for
some reason.
DATA PDUS TRANSMITTED
Support: All
Number of data- and error-report NPDUs, after fragmentation, that have
been delivered to the port for transmission on this circuit. This
number includes all PDUs recognized by the receive process as data PDUs
DECnet-Plus data- and error-report PDUs and Phase IV data packets,
even though they may subsequently be discarded for some reason.
EXCEEDED MAXIMUM SVC ADJACENCIES
Support: End,L2
Number of exceeded maximum svc adjacency events that have been
generated. This counter is supported only if the circuit's type is
set to x25 da; only for nodes that are end nodes; and if the system
supports dual routing both DECnet and IP routing.
ID REACHABILITY CHANGES
Support: All
Number of ID reachability change events that have been generated.
INITIALIZATION FAILURES
Support: All
Number of times that an attempt to initialize an adjacent node over
this circuit has failed, either because of version skew or area
mismatch.
IP FRAGMENTATION FAILURE DISCARDS
Support: IP
Number of IP packets discarded because fragmentation was required to
transmit them, but the IP header requested "do not fragment."
IP FRAGMENTS CREATED
Support: IP
Number of IP fragments created for transmission on this circuit.
IP PACKETS FORWARDED
Support: IP
Number of IP packets forwarded on this circuit before fragmentation.
These IP packets may be from another circuit or from a local port.
Note that this value includes those IP packets counted in the ip
send discards counter.
IP PACKETS FRAGMENTED
Support: IP
Number of IP packets that have been fragmented on this circuit.
IP PACKETS RECEIVED
Support: IP
Number of IP packets received on this circuit. This value includes all
types of IP packet control, data, etc., and those that may
subsequently be discarded for any reason.
IP RECEIVED DISCARDS
Support: IP
Number of IP packets that have been received and then discarded because
of congestion.
IP SEND DISCARDS
Support: IP
Number of IP packets for transmission that have been discarded because
of congestion.
IRRECOVERABLE SVC FAILURES
Support: All
Number of times that the number of re-call attempts on this circuit
has become equal to the value of the characteristic maximum call
attempts. This attribute is supported only if the characteristic
type is set to x25 static outgoing.
LAN L1 DESIGNATED ROUTER CHANGES
Support: L1,L2
Number of times the local node has either elected itself or resigned
as the LAN level 1 designated router on this circuit. This attribute
is supported only if the circuit's characteristic type is set to
csma-cd.
LAN L2 DESIGNATED ROUTER CHANGES
Support: L2
Number of times the local node has either elected itself or resigned
as the LAN level 2 designated router on this circuit.
LAN PHASEIV DESIGNATED ROUTER CHANGES
Support: L1,L2
Number of times the local node has either elected itself or resigned as
the LAN Phase IV designated router on this circuit.
REDIRECT DISCARDS
Support: End
Number of Redirect PDUs that have been discarded because of
insufficient cache memory.
REJECTED ADJACENCIES
Support: All
Number of times an attempt to create a new adjacency using this
circuit has failed because of insufficient resources.
REJECTED IP ADJACENCIES
Support: L2,IP
Number of times an attempt to automatically create a new IP adjacency
to an IP router has failed because of lack of resources.
RIP ERRORS RECEIVED
Support: L2,IP
Number of RIP messages received with any kind of received error on this
circuit. This attribute is supported only if the routing entity's
characteristic routing protocols supported includes the routing
protocol RIP.
SEGMENTATION FAILURE DISCARDS
Support: L1,L2
Number of data NPDUs that have been discarded because segmentation was
required to send them on this circuit but was not permitted in the
NPDU header.
VERIFICATION REJECT EVENTS
Number of verification reject events that have been generated. This
attribute is supported only if the characteristic type is set to
DDCMP, HDLC, X25 static incoming, X25 static outgoing, or X25
permanent.
5.3 – status
DATA LINK PORT
Support: All
Name of the data link port used for this circuit. Not supported on
DA circuits.
DATA LINK SDU SIZE
Support: All
Maximum size, in octets, of a Data Link SDU for this circuit. This
includes the Network layer header, but excludes the Data Link layer
header. The value of this status is the lesser of the value of the
characteristic manual data link sdu size and any limit imposed by
the Data Link layer.
LAN L1 ID
Support: L1,L2
LAN ID allocated by the LAN level 1 designated router. This attribute
is supported only if the circuit's characteristic type is csma-cd.
LAN L2 ID
Support: L2
LAN ID allocated by the LAN level 2 designated router. This attribute
is supported only if the circuit's characteristic type is CSMA-CD.
L1 DESIGNATED ROUTER
Support: L1,L2
ID of the DECnet-Plus level 1 designated router on this circuit. This
attribute is supported only if the circuit's characteristic type is
CSMA-CD. If this node does not participate in the router election
process, the value returned is 00-00-00-00-00-00.
L2 DESIGNATED ROUTER
Support: L2
ID of the DECnet-Plus level 2 designated router on this circuit. This
attribute is supported only if the circuit's characteristic type is
CSMA-CD. If this node does not participate in the router election
process, the value returned is 00-00-00-00-00-00.
PHASEIV DESIGNATED ROUTER
Support: L1,L2
ID of the Phase IV designated router on this circuit. This attribute
is supported only if the circuit's characteristic type is CSMA-CD.
If this node does not participate in the router election process, the
value returned is 00-00-00-00-00-00.
POINT-TO-POINT ID
Support: L1,L2
ID allocated to the circuit during its initialization. This attribute
is supported only if the circuit's characteristic type is HDLC,
DDCMP, or X25 static.
STATE
State of the routing circuit entity.
OFF - The circuit is disabled.
ON - The circuit is enabled.
6 – circ_adj
A routing circuit adjacency entity describes an adjacency, which is a neighboring node that is accessible through a particular circuit. The circuit-name refers to the circuit associated with the specified adjacency.
6.1 – status
DATA LINK PORT
Support: All
Name of the data link port used for this X.25 data adjacency. This
attribute is supported only if the owning routing circuit entity's
characteristic type is set to x25 da.
DTE ADDRESS
Support: All
DTE address of the neighboring node on an X.25 circuit. This status is
supported only if the owning circuit entity's characteristic type
is x25 da.
ENDNODE IDS
Support: All
System IDs of neighboring end nodes. This attribute is supported only
if the node is an end node and the owning circuit entity's
characteristic type is not x25 da.
ENDNODE NETS
Support: All
NETs computed from the system IDs in the endnode ids status and the
set of area addresses in the owning routing entity's manual area
addresses set. This attribute is supported only if the node is an
end node and the owning circuit entity's characteristic type is not
x25 da.
HOLDING TIMER
Support: L1,L2
Holding time for this adjacency, updated from the router-to-router
Hello messages. This attribute is supported only if both the node and
the adjacency are routers.
IP ADDRESSES
Support: IP
IP addresses of the neighbor node. If these are not known, the set is
empty.
LAN ADDRESS
broadcast circuit. This status is supported only if the owning
circuit entity's characteristic type is csma-cd.
LAN PRIORITY
Support: L1,L2
Priority of the neighbor of this adjacency for becoming the LAN level
1 designated router if the adjacency is a DECnet-Plus level 1 router
or the LAN level 2 designated router if the adjacency is a DECnet-Plus
level 2 router. This status is supported only if the owning circuit
entity's characteristic type is csma-cd; and the adjacency is a
router rather than an end node.
LEVEL
Support: L1,L2
The level of the adjacency. This attribute is supported only if both
the node and the adjacency are routers.
Level 1 - The adjacency is used for level 1 routing.
Level 2 - The adjacency is used for level 2 routing.
Level 1 & 2 - The adjacency is used for level 1 and level 2 routing.
Level 0 - The usage is undefined.
NEIGHBOR AREAS
Support: L1,L2
Area addresses of the neighboring node. This attribute is supported
only if both the node and the adjacency are routers and the owning
circuit entity's characteristic type is not x25 da.
NEIGHBOR NODE ID
Support: L1,L2
Node ID of the neighboring node.
NEIGHBOR NODE TYPE
Support: All
Type of the neighboring node. This status is supported only if the
owning circuit entity's characteristic type is not x25 da.
DECnet-Plus endnode - The node is a DECnet-Plus end node.
DECnet-Plus level 1 router - The node is a DECnet-Plus level 1 router.
DECnet-Plus level 2 router - The node is a DECnet-Plus level 2 router.
DECnet-Plus router - The node is a DECnet-Plus router.
non-dna router - The node is not a DNA router.
phaseiv endnode - The node is a Phase IV end node.
phaseiv level 1 router - The node is a Phase IV level 1 router.
phaseiv level 2 router - The node is a Phase IV level 2 router.
phaseiv router - The node is a Phase IV router.
unknown - The node type is unknown.
NEIGHBOR PROTOCOLS SUPPORTED
Support: IP
Network protocols supported by the neighboring node either IP or
ISO8473.
ROUTER NETS
Support: End
Network Entity Titles NETs of a neighboring router. This status is
supported only if the adjacency is a level 1 or level 2 router, and
the owning circuit entity's characteristic type is not x25 da.
STATE
Support: All
State of the routing circuit adjacency entity. May be one of the
following:
FAILED
INITIALIZING
UP
UP/DORMANT
TYPE
Type of adjacency.
AUTOCONFIGURED - Created by autoconfiguration.
MANUAL - Created manually by a create command.
This attribute indicates whether the adjacency has been manually
created, or whether the adjacency was created by means of hello PDUs.
It will always have the value manual when it has been created by the
create command; otherwise, it will have the value autoconfigured.
7 – cir_ip_trn
A routing circuit ip address translation entity describes the mapping between the IP address of an IP adjacency on a broadcast circuit and its LAN address. This entity is supported only on systems that support dual routing. ip address translation entities are created automatically, but can be deleted manually.
7.1 – status
LAN ADDRESS
Support: IP
LAN address that corresponds to the IP address of this neighbor.
8 – cir_ip_rch
A routing circuit ip reachable address entity describes a manually entered subnet address that is accessible by way of a specified circuit. An IP reachable address allows a level 2 router at the boundary of a routing domain to include information about the address and reachability of subnetworks outside the domain. IP reachable addresses exist only on level 2 routers that support dual routing.
8.1 – character
DESTINATION
Support: L2,IP
The IP address and subnet mask to which this reachable address refers.
This value is derived from the destination argument of the create
command. You cannot modify this characteristic.
DTE ADDRESSES
Support: L2,IP
Default: No DTE addresses Value: Set of DTE addresses
A set of DTE addresses to which a call may be directed in order to
reach an address that matches the subnet address given by the subnet
address characteristic. You can modify this characteristic only when
the entity is disabled. This characteristic is supported only if the
owning circuit is an X.25 circuit.
METRIC
Support: L2,IP
Default: 20 Value: 1-maximum link cost
Default metric value for reaching the specified subnet over this
circuit. You can modify this characteristic only when the entity is
disabled.
METRIC CLASS
Support: L2,IP
Default: External Value: External or Internal
Class of the default metric, which controls the preference for this
route in the decision process.
EXTERNAL - The I/E bit for the default metric in the External
Reachability Information option of level 2 link state
packets is set to 1. The subnet address specified by this
IP reachable address will have the same preference as level
2 external routes.
INTERNAL - The I/E bit for the default metric in the External
Reachability Information option of level 2 link state
packets is set to 0. The subnet address specified by this
IP reachable address will have the same preference as level
2 internal routes.
You can modify this characteristic only when the entity is disabled.
NEXT HOP
Support: L2,IP
Default: 0.0.0.0 Value: Ip-address
IP address of the neighboring node through which the destination is
reachable. When you create this entity, this characteristic is set to
the value of the IP address component of the destination argument
of the create command if the IP reachable address is to an IP host.
This characteristic is not used on circuits of type x25 da. You can
modify this characteristic only when the entity is disabled.
8.2 – status
STATE
Status of the routing circuit reachable address entity.
OFF - The IP reachable address is disabled.
ON - The IP reachable address is enabled.
9 – cir_rch
A routing circuit reachable address entity contains information about a manually entered address prefix accessible over that circuit. It exists only on L2 routers and end nodes. On L2 routers the type may be outbound or inbound. A reachable address of type outbound default describes address prefixes in an external domain that are reachable by outbound traffic over this circuit. The routing information contained in the reachable address is entered directly into the L2 decision process. When ManualL2Algorithm has the value routing vector, only reachable addresses with address prefixes corresponding to Phase IV areas are fed into the decision process. An inbound reachable address describes address prefixes corresponding to Phase IV areas which are reachable through the local node by inbound traffic over this circuit. The routing information contained in the reachable address area and cost is entered into a Phase IV routing vector message, which is transmitted periodically over this circuit. On an end system the type may be outbound or for a broadcast circuit only filter. A reachable address of type outbound behaves in a similar way to that on an L2 router except that the routing information is used to control the operation of the ES cache. A reachable address of type filter is used to specify the permitted LAN address of routers on the LAN which will be used by the cache algorithm. The circuit-name refers to the circuit associated with the specified reachable address. The address-prefix refers to the reachable address managed by this command.
9.1 – character
ADDRESS PREFIX
Support: L2, End
Default: No default Value: Address prefix
Address prefix to which this reachable address refers. You cannot
modify this characteristic. This characteristic is set by means of an
argument to the create command.
The value of this characteristic derives from an argument to the
create command. This characteristic is supported only if the owning
circuit has type set to x25 da.
COST
Support: L2
Default: 20 Value: 1-63
Cost of reaching this address prefix over this circuit.
DATA FORMAT
Support: L2
Default: DECnet-Plus Value: Phase IV or DECnet-Plus
The PDU data format to be used when forwarding data or error report
NPDUs using this reachable address.
This attribute is supported only if the type characteristic is set
to outbound. You can modify this characteristic only when the entity
is disabled.
DTE ADDRESSES
Support: End,L2
Default: No DTE addresses Value: set of DTE addresses
A set of DTE addresses to which a call may be directed in order to
reach an address that matches the address prefix of this reachable
address.
This characteristic is supported if the node is a level 2 router,
where the owning circuit's characteristic type is one of the X.25
circuit types, and the reachable address's characteristic type is
outbound. It is also supported by end nodes operating over an x25
da circuit. You can modify this characteristic only when the entity
is disabled.
ISDN ADDRESS
Support: L1,L2
Default:
A full set of E.164 ISDN network addresses that a call may be directed
in order to reach a network number that matches the address prefix of
the parent reachable address entity. Associated with each ISDN
network address, but not visible to Network Management, is a variable
last failure of type binary absolute time. This attribute is supported
only if access type is ISDN DA.
LAN ADDRESS
Support: L2,End
Default: 00-00-00-00-00-00 Value: id
A single LAN address to which an NPDU can be directed in order to reach
an address that matches the address prefix of this reachable address.
This characteristic is supported only if the owning circuit's
characteristic type is csma-cd, and the reachable address's
characteristic type is outbound. You can modify this characteristic
only when the entity is disabled.
MAPPING
Support: End,L2
Default: X.121 Value: Manual or X.121
Type of mapping used to determine the SNPA address to which a call
should be placed for this address prefix. You can modify this
characteristic only when the entity is disabled. If the circuit is a
broadcast circuit, this attribute must have the value manual.
MANUAL - The mapping uses the set of addresses in the characteristic
dte addresses or the address in the characteristic LAN
address.
X.121 - The mapping uses the X.121 address extraction algorithm.
This characteristic is supported only if either of the following
conditions is satisfied:
o The node is a level 2 router or an end node, and the owning circuit's
characteristic type is one of the X.25 circuit types.
o The node is a level 2 router, the owning circuit's characteristic
type is csma-cd, and the reachable address's characteristic type
is outbound.
METRIC TYPE
Support: L2
Default:
The metric type of the cost metric for the circuits. If internal, the
I/E bit for the metric in the Prefix Neighbors option of L2 LSPs is set
to 0, otherwise external is set to 1.
TYPE
Support: L2,End
Default: Outbound Value: see below
Type of the reachable address. You can modify this characteristic only
when the entity is disabled.
INBOUND - For L2 only, the address prefix corresponds to a Phase IV
area that is reachable through this node and circuit by
inbound traffic.
OUTBOUND - The address prefix is in an external domain that is
reachable over this circuit by outbound traffic.
FILTER - The address prefix defines a set of addresses that should be
reached via the set of routers listed in the permitted LAN
address characteristic.
9.2 – status
STATE
State of the routing circuit reachable address entity.
OFF - The reachable address is disabled.
ON - The reachable address is enabled.
10 – dest_area
A routing destination area entity contains information about a destination area or reachable address prefix. These entities are created and deleted dynamically by the Routing module. Destination areas exist only on nodes that are level 2 routers.
10.1 – stATUS
COST
Support: L2
Cost of the least cost paths to this destination area.
OUTPUT ADJACENCIES
Support: L2
Set of routing circuit and routing circuit adjacency or routing
circuit reachable address entity names that represent the forwarding
decisions for this destination area.
11 – dest_node
A routing destination node entity contains information about a particular destination node within the same area as this node. These entities are created and deleted automatically by the Routing module. Destination nodes exist only on nodes that are level 1 or level 2 routers.
11.1 – status
COST
Support: L1,L2
Cost of the least cost paths to this destination node.
NETS
Support: L1,L2
Set of NETs computed from the system ID that is the entity's name and
the area addresses in the routing entity's manual area addresses
set.
OUTPUT ADJACENCIES
Support: L1,L2
Set of routing circuit and routing circuit adjacency entity names
representing the forwarding decisions for this destination node.
12 – route_egp_grp
A routing egp group entity defines a set of systems in the same autonomous system with which this system may exchange EGP messages. This entity is supported only on level 2 routers that support dual routing and, in particular, the EGP routing protocol.
12.1 – character
AUTONOMOUS SYSTEM NUMBER
Support: L2,IP
Default: 0 Value: 0-65535
The autonomous system number common to members of this group. You can
modify this characteristic only when the entity is disabled. This
attribute is supported only if the node is a level 2 router, and if the
system supports dual routing both DECnet and IP routing.
EXTERNAL ROUTES
Support: L2,IP
Default: Receive Value: Set of send,recieve
If the set includes receive, external gateway routes are accepted from
neighbors in the group; if the set does not include receive, external
gateway routes are discarded. If the set includes send, external
gateway routes will be sent to neighbors in this group; if the set does
not include send, external gateway routes are not sent. You can modify
this characteristic only when the entity is disabled.
MAXIMUM ACTIVE NEIGHBORS
Support: L2,IP
Default: 1 Value: 0-255
The maximum number of neighbor systems in the group that this system
will attempt to acquire and maintain in the Up state at any given time.
You can modify this characteristic only when the entity is disabled.
RECEIVE METRIC CLASS
Support: L2,IP
Default: External Value: Internal or External
The class to be associated with routes received from EGP neighbors in
this group unless overridden by a routing receive route entity. You
can modify this characteristic only when the entity is disabled.
SEND LOCAL METRIC
Support: L2,IP
Default: 1 Value: 0-255
The metric value to be used when announcing routes derived from local
information unless overridden by a routing send route entity. You
can modify this characteristic only when the entity is disabled.
SEND METRIC CLASSES
Support: L2,IP
Default: Internal Value: Set of external, internal
Routes received through routing protocols other than EGP with metric
classes in this set are candidates for announcement in EGP messages
sent to neighbors in this group, subject to route propagation policy.
Routes with metric classes not specified in this set will not be
announced. You can modify this characteristic only when the entity is
disabled.
SEND REPLACEMENT METRIC
Support: L2,IP
Default: 1 Value: 0-255
Specifies the metric value to be used when announcing routes derived
from non-EGP routing protocols unless overridden by a routing send
route entity. You can modify this characteristic only when the
entity is disabled.
12.2 – status
STATE
State of the routing egp group entity.
OFF - The entity is disabled.
ON - The entity is enabled.
13 – egp_neghbr
A routing egp group egp neighbor entity defines one of the systems in the autonomous group defined by the owning egp group entity. This entity is supported only on level 2 routers that support dual routing and, in particular, the EGP routing protocol.
13.1 – character
CIRCUIT
Simple-name of the circuit.
IP ADDRESS
Support: L2,IP
Internet address of this EGP neighbor. The value of this characteristic
is derived from the ip address argument of the create command. You
cannot modify this characteristic.
NEXT HOP
Default: 0.0.0.0 Value: IP address
IP address and the next routing node.
SOURCE NETWORK
Default: 0.0.0.0 Value: Network number
Network number to query.
13.2 – counters
ERROR MESSAGES RECEIVED
Support: L2,IP
Number of EGP error messages received from this neighbor.
ERROR MESSAGES SENT
Support: L2,IP
Number of EGP error messages sent to this neighbor.
MESSAGES RECEIVED
Support: L2,IP
Number of EGP messages received without error from this neighbor.
MESSAGES SENT
Support: L2,IP
Number of EGP messages sent to this neighbor. Note that this value
does not include EGP messages counted by the counter send messages
discarded.
RECEIVED MESSAGES DISCARDED
Support: L2,IP
Number of EGP messages received from this neighbor with any kind of
error.
SEND MESSAGES DISCARDED
Support: L2,IP
Number of EGP messages not sent to this neighbor because of resource
limitations within the egp entity.
START EVENTS
Support: L2,IP
Number of times the EGP neighbor has been manually started.
STATE CHANGES FROM UP
Support: L2,IP
Specifies the number of times the EGP state of this neighbor changed
from Up to some other state.
STATE CHANGES TO UP
Support: L2,IP
Specifies the number of times the EGP state of this neighbor changed
to Up from some other state.
STOP EVENTS
Support: L2,IP
Number of times the EGP neighbor has been manually stopped.
13.3 – status
EGP STATE
Support: L2,IP
EGP state of the system with respect to this EGP neighbor.
ACQUISITION IDLE
CEASE UP
DOWN
HELLO TIME
Support: L2,IP
Interval, in hundredths of a second, between retransmissions of EGP
Hellos. This value represents the t1 timer defined in RFC 904.
LAST EVENT
Support: L2,IP
Specifies whether the last event issued on this EGP neighbor was a
start or a stop event.
START - The last event was a start.
STOP - The last event was a stop.
This is the value with which an EGP neighbor is created, before either
a start or stop command has been issued.
POLLING MODE
Support: L2,IP
Polling mode of the EGP entity with respect to this neighbor as either
active or passive.
POLL TIME
Support: L2,IP
Interval, in hundredths of a second, between retransmissions of EGP
polls. This value represents the t3 timer defined in RFC 904.
STATE
State of the routing egp group egp neighbor entity.
ON - The entity is enabled.
OFF - The entity is disabled.
14 – ip_dest
A routing ip destination address entity describes IP routing information in the shortest paths database. This entity is supported only on routers that support dual routing.
14.1 – status
LEVEL
Support: L1,L2,IP
Level at which the shortest path exists in the shortest paths database.
Level 1
Level 2 External
Level 2 Internal
METRIC
Support: L1,L2,IP
Default metric value for the shortest path to the destination
subnetwork.
PATHS
Support: L1,L2,IP
Equal cost paths for this route. The following information appears for
each path:
o The name of the entity pair that represents the forwarding decision
for this path circuit and one of adjacency, IP adjacency, or IP
reachable address.
o The routing mechanism through which the route was learned:
LOCAL -- the route is derived from the subnet address or
alternative subnet addresses characteristics of a local
circuit.
NETMGNT-- the route is derived from manually configured
information on the local system.
o The number of seconds since the route was last updated.
15 – routing p_nghbr
A routing permitted neighbor entity represents a neighboring node on a nonbroadcast circuit that is permitted to connect to this node.
15.1 – character
ID
Support: All
Default: No default Value: NOde ID
Node ID of a potential neighbor node. You cannot modify this
characteristic. This characteristic is set by means of an argument to
the create command.
VERIFIER
Support: All
Default: No verifier Value: Hex-string, length 0-38
Verifier to be checked from this neighbor. You may change this
characteristic at any time; however, the change will not take effect
until the circuit is next initialized. You cannot display this
characteristic.
If the verifier is not set, then a connection to the neighboring node
whose ID matches the ID in this entry is allowed. If the verifier is
set, the connection is allowed only if the verifier sent by the remote
node matches the one in this entry.
16 – port
A routing port entity represents a client of the Routing module, and presents information associated with that client.
16.1 – counter
DATA SDUS RECEIVED
Support: All
Number of data NSDUs delivered across Transport interface after
reassembly.
ERROR REPORTS RECEIVED
Support: All
Number of error report PDUs delivered across Transport interface.
EXPIRED SEGMENTS DISCARDED
Support: All
Number of segments discarded because lifetime expired during reassembly.
IP PACKETS REASSEMBLED
Support: IP
Number of IP packets that have been successfully reassembled from
fragments.
SDUS TRANSMITTED
Support: All
Number of data NSDUs requested for transmission across Transport
interface.
SEGMENTS DISCARDED
Support: All
Number of segments data- or error-report discarded before delivery
across the Transport interface, including segments discarded for any
reason other than lifetime expiration during reassembly.
SEGMENTS RECEIVED
Support: All
Number of data- and error-report NPDUs received before reassembly.
16.2 – status
CLIENT
Support: All
Name given by the user of the port when the port was opened.
NSAP ADDRESSES
Support: All
Set of NSAP addresses to be received at this port. This attribute is
supported only if the status attribute type is not set to IP.
NSAP SELECTOR
Support: All
Network service access point NSAP selector octet supplied by the
client. This attribute is supported only if the status attribute
type is not set to ip.
PROTOCOL TYPE
Support: IP
Value of the IP protocol field specified by the client.
TYPE
Support: IP
Type of connectionless network service to be used: IP or ISO8473.