show [node node-id] ddcmp -
link link-name -
logical station station-name attribute [,attribute...]
all [attributes]
all characteristics
all counters
all identifiers
all status
The link-name must be a simple name which uniquely represents
a particular LINK instance. The station-name can be either
a simple name which uniquely identifies a particular
logical station or a wildcard which identifies multiple
logical stations.
Examples:
show ddcmp link ddcmp-0 logical station * name
show ddcmp link ddcmp-0 logical station ddcmp-0 all
1 – Characteristics
o active base
Default: 255 Value: 0-255
Specifies the base priority to which an active tributary is reset
after it has been polled.
This characteristic is supported only if the characteristic
protocol of the owning ddcmp link entity is set to control.
o active increment
Default: 0 Value: 0-255
Specifies the value to be added to the active tributary priority
each time the scheduling timer expires.
This characteristic is supported only if the characteristic
protocol of the owning ddcmp link entity is set to control.
o address
Default: 1 Value: 1-255
Data link address of the remote station or tributary. You can
modify this characteristic only when the entity is disabled.
o babble timer
Default: 6000 Value: 1-65535
Specifies the time, in milliseconds, for which a selected
tributary or remote station is allowed to transmit. This
characteristic is not used on full-duplex links.
This characteristic is not supported if the characteristic
protocol of the owning ddcmp link entity is set to tributary.
o buffer source
Default: Implementation-specific Value: See description
Specifies the source of the receive buffers.
client Buffers are provided by the client entity.
supplied
common pool Buffers are assigned from the common buffer pool.
This characteristic is supported only if the characteristic
protocol of the owning ddcmp link entity is set to control. You
can modify this characteristic only when the entity is disabled.
o dead threshold
Default: 8 Value: 0-255
Specifies the number of times that an active, inactive, or dying
tributary is polled before its status attribute polling substate
is changed to dead because of receive timeouts.
This characteristic is supported only if the characteristic
protocol of the owning ddcmp link entity is set to control.
o dying base
Default: 0 Value: 0-255
Specifies the base priority to which a dying tributary is reset
after being polled.
This characteristic is supported only if the characteristic
protocol of the owning ddcmp link entity is set to control.
o dying increment
Default: 16 Value: 0-255
Specifies the value to be added to a dying tributary's priority
each time the scheduling timer expires.
This characteristic is supported only if the characteristic
protocol of the owning ddcmp link entity is set to control.
o dying threshold
Default: 2 Value: 0-255
Specifies the number of times an active or inactive tributary is
polled before its status attribute polling substate is changed to
dying because of receive timeouts.
This characteristic is supported only if the characteristic
protocol of the owning ddcmp link entity is set to control.
o holdback timer
Default: 0 Value: 0-13000
Maximum time (in milliseconds) that the local station can delay
acknowledging a received message if there is no data to send.
The value of this characteristic is linked to the retransmit
timer used on the remote station. A suggested value is between
10% and 20% of that timer. However, the actual values you can use
may be limited by the communications product.
The default value indicates that no holdback is used and the
local station must acknowledge immediately.
o inactive base
Default: 0 Value: 0-255
Specifies the priority to which an inactive tributary is reset
after it has been polled.
This characteristic is supported only if the characteristic
protocol of the owning ddcmp link entity is set to control.
o inactive increment
Default: 64 Value: 0-255
Specifies the value to be added to an inactive tributary's
priority each time the scheduling timer expires.
This characteristic is supported only if the characteristic
protocol of the owning ddcmp link entity is set to control.
o inactive threshold
Default: 8 Value: 0-255
Specifies the number of times an active tributary is polled
before its status attribute polling substate is changed to
inactive because of no data response.
This characteristic is supported only if the characteristic
protocol of the owning ddcmp link entity is set to control.
o maximum buffers
Default: 4 Value: Implementation specific
Specifies the maximum number of buffers that a tributary can
use from the common buffer pool. A value of 0 means that
there is no limit to the number of buffers that can be used.
This characteristic is supported only if the buffer source
characteristic is set to common pool.
This characteristic is supported only if the characteristic
protocol of the owning ddcmp link entity is set to control. You
can modify this characteristic only when the entity is disabled.
Also, you can only increase the characteristic value.
o maximum transmit
Default: 4 Value: 1-255
Specifies the maximum number of messages that a tributary or a
remote half-duplex station can send at one time. The value of
this characteristic must be greater than or equal to that of
transmit window on the selected station.
This characteristic is not supported if either of the following
conditions is true:
o The characteristic protocol of the owning ddcmp link entity is
set to tributary.
o The communications link is full-duplex and point-to-point.
You cannot modify this characteristic.
o polling state
Default: Automatic Value: See description.
Specifies the effect of the local station's polling algorithm
on the state of a tributary. The value of this characteristic is
reflected in the value of the status attribute polling substate.
active The state is locked to active.
automatic The state varies according to the operation of the
polling algorithm.
dead The state is locked to dead.
dying The state is locked to dying.
inactive The state is locked to inactive.
This characteristic is supported only if the characteristic
protocol of the owning ddcmp link entity is set to control.
o transmit timer
Default: 0 Value: 0-65535
Specifies the time, in milliseconds, that the local station waits
between data transmissions.
This characteristic is supported only if the characteristic
protocol of the owning ddcmp link entity is set to control.
o transmit window
Default: 1 Value: 1-255
Specifies the maximum number of data messages that the local
station can send without receiving an acknowledgment. This
characteristic applies only when the remote station is a control
station or on a half-duplex, point-to-point link. The value of
this characteristic must be less than or equal to the equivalent
of the maximum transmit characteristic on the control station or
remote station.
2 – Counters
o buffers temporarily unavailable
Number of times the local station could not service messages
from the remote station because there were no receive buffers
available.
o buffers too small
Number of times the local station could not service messages from
the remote station because the receive buffers were not large
enough.
o creation time
Time at which this entity was created.
o incomplete replies to select
Specifies the number of selection intervals that were not
properly terminated (that is, by a message with the Select bit
set in the header), during which a transmission was received or
an attempt at transmission was detected.
This counter is supported only if the protocol characteristic of
the owning ddcmp link entity is set to control, or when the link
is a half-duplex point-to-point link.
o local reply timeouts
Number of times the local station failed to receive an
acknowledgment before the reply timer expired.
o locally initiated state changes
Number of times that the station protocol state changed through
action of the local station.
o naks received indicating buffer too small
Number of times the remote station reported that it could not
service a message because the receive buffer was not large
enough.
o naks received indicating buffers temporarily unavailable
Number of times the remote station reported that it could not
service a message because no receive buffer was available.
o naks received indicating data field block check error
Number of times the remote station reported that a block check
error was detected in the data field of an incoming message.
o naks received indicating header block check error
Number of times the remote station reported that a block check
error was detected in the header block of an incoming message.
o naks received indicating rep response
Number of times the remote station reported that it did not
receive all the messages sent from the local station.
o naks sent with rep response
Number of times that the local station detected that not all
of the messages sent from the remote station were received
correctly.
o no replies to select
Specifies the number of times that the select timer expired for
any of the following reasons:
o No valid control message was received.
o No valid header to a data message was received.
o No valid header to a maintenance message from the selected
station was received.
o No transmission from the remote station was received.
This counter is supported only if the protocol characteristic of
the owning ddcmp link entity is set to control, or when the link
is a half-duplex point-to-point link.
o pdus received with data field check block error
Number of messages received with a check error in the data field.
o pdus received with header block check error
Number of messages received with a check error in the header
block.
o receive error thresholds reached
Number of times that the receive error threshold has been
reached.
o remote reply timeouts
Number of times the local station received a REP message and
sent an acknowledgment in return. This sequence indicates that
all messages sent from the remote station have been correctly
received.
o remotely initiated state changes
Number of changes in the station protocol state caused by action
of the remote station.
o sdu octets received
Number of data octets received from the remote station.
o sdu octets sent
Number of data octets sent to the remote station.
o sdus received
Number of data messages received from the remote station (not
including retransmissions).
o sdus sent
Number of data messages sent to the remote station (not including
retransmissions).
o selection error thresholds reached
Number of times that the selection error threshold has been
reached.
This counter is not supported if the characteristic protocol of
the owning ddcmp link entity is set to tributary.
o selection intervals
Number of times that the local station selected the remote or a
tributary station. The counter does not appear if the link uses
the tributary protocol. In addition, the counter appears only
when the local station is the control station for a number of
tributaries, or is operating over a half-duplex point-to-point
link.
This counter is supported only if the protocol characteristic of
the owning ddcmp link entity is set to control, or when the link
is a half-duplex point-to-point link.
o send error thresholds reached
Number of times that the send error threshold has been reached.
o strts received while in maintenance
Number of times that the local station received a STRT protocol
message while in the Maintenance state.
3 – Identifier
o name
Simple name assigned to the link logical station when it is
created.
4 – Status
o polling substate
Specifies the state of a tributary as determined by the polling
algorithm. This attribute applies only when the value of the
link's protocol characteristic is set to control. The value of
this attribute is affected by the value of the characteristic
polling state. If the characteristic polling state is set to
automatic, the value of this status attribute reflects the
current state of the polling algorithm. For all other values of
the polling state characteristic, the values of both attributes
are the same.
active The tributary is active and responds with data when
selected.
dead The tributary did not respond when selected within
the appropriate timeout period, when already in
the Dying or Inactive state. The tributary will be
ignored until the station reinitializes.
dying The tributary, currently in the Inactive or Active
state, has not responded within the appropriate
timeout period when selected.
inactive The tributary has not sent any data when selected
by the control station. However, the tributary has
responded with an appropriate message when selected.
o protocol state
State of the data link protocol with the remote station.
halted The protocol is stopped and no messages are being
exchanged with the remote station.
maintenance The protocol is off line and dealing with
maintenance messages only.
running The protocol is on line and is exchanging messages
with the remote station.
starting There is an attempt to initialize the protocol
between the local and remote stations. This uses
the STRT and STACK PDUs.
o state
Operational state of the local logical station.
off The station is disabled.
on The station is enabled.
o uid
Entity's unique identifier, which is generated when the entity is
created.