show [node node-id] hdlc -
link link-id attribute [,attribute...]
all [attributes]
all characteristics
all counters
all identifiers
all status
Examples:
show hdlc link * name, state
show hdlc link hdlc-0 all
1 – Characteristics
o acknowledge timer
Default: 3000 Value: 1-60000
Time (in milliseconds) to wait for an acknowledgment before using
error recovery procedures. The value of this characteristic
corresponds to the T1 parameter of HDLC. You can modify this
characteristic only when the entity is disabled.
o holdback timer
Default: 0 Value: 1-60000
Maximum time to wait before sending an acknowledgment supervisory
frame if no other frames carry the acknowledgment. A value of
zero means that the frame will be sent immediately if no I-frame
can be sent. You can modify this characteristic only when the
entity is disabled.
o link type
Operational mode of the HDLC link. The value of this
characteristic is a copy of the link type argument specified when
the entity is created. You cannot modify this characteristic.
o maximum data size
Default: 1500 Value: 262-65532
Maximum number of bytes that users of the data link can specify.
This number applies to both transmit and receive frames.
The value of this characteristic must be greater than or equal to
the value of the minimum data size characteristic. You can modify
this characteristic only when the entity is disabled.
o maximum unsequenced pdus
Default: 1 Value: 1-127
Maximum number of unsequenced I-frames that a primary or
secondary station can send in a single transmission. This
characteristic is not used if the link type characteristic is
balanced.
o minimum data size
Default: 576 Value: 262-65532
Minimum number of bytes that users of the data link can specify.
This number applies to both transmit and receive frames.
The value of this characteristic must be less than or equal to
the value of the maximum data size characteristic. You can modify
this characteristic only when the entity is disabled.
o physical line
Default: None Value: local entity name
Local entity name of the the Physical layer entity over which the
HDLC protocol is to operate.
This characteristic must have a value before the HDLC link is
enabled. You can modify this characteristic only when the entity
is disabled.
o preferred crc type
Default: Either Value: 16 bit, 32 bit, or either
CRC types available for negotiation. If the value of this
characteristic is either, the station will try to use 32-bit but
will use 16-bit if that is all that the remote station supports.
o preferred local station address
Default: 2 Value: 1-253
Address proposed for the local logical station during
negotiation. If there is no negotiation, the value of this
characteristic is the value that is used. If negotiation is
necessary, the value of this characteristic must be between 2
and 253. You can modify this characteristic only when the entity
is disabled.
o preferred maximum data size
Default: 1500 Value: 262-65532
Default size (in octets) of frames that the station receives and
transmits. This value is used only if the link initialization
does not specify a buffer value.
The value of this characteristic must lie between those of the
maximum data size and minimum data size characteristics. You can
modify this characteristic to a lower value only when the entity
is disabled.
o preferred window size
Default: 2 Value: 1-127
Window size to be offered during negotiation for both receive
and transmit frames. The value of this characteristic must be
compatible with that for the sequence modulus characteristic.
o profile (OpenVMS)
Simple name that can be used when the HDLC protocol is dependent
on network subscription time commitments pertinent to the Data
Link layer. The value of this characteristic is a copy of the
profile argument specified when the entity is created. You cannot
modify this characteristic.
o receive buffers (OpenVMS)
Default: 4 Value: 1-128
Number of receive buffers reserved for the link. This
characteristic can only be set to a lower value when the entity
is disabled.
o retry maximum
Default: 10 Value: 1-255
Maximum number of times that a frame will be retransmitted before
the local station assumes that a fatal error has occurred. This
characteristic can be modified only when the entity is disabled.
o sequence modulus
Default: 128 Value: 8 or 128
Whether modulo-8 or modulo-128 sequence numbering is allowed
on the HDLC link. The value 8 means that only normal sequence
numbering is allowed. The value 128 means that both extended and
normal sequence numbering are supported for negotiation.
2 – Counters
o buffer unavailable errors
Number of times that the Physical layer reported that no buffer
was available to hold a message. This counter is not supported in
all implementations.
o crc errors received
Number of frames received that had a bad CRC.
o creation time
Time at which this entity was created.
o times pdu receive overrun
Number of times a Physical line indicated an overrun condition
to the Data Link layer. This counter is not supported in all
implementations.
o times pdu transmit failed
Number of times that an attempt to send a frame failed.
o up transitions
Number of times that the entity's status attribute state has
changed from off to on.
3 – Identifier
o name
Simple name assigned to the HDLC link when it is created.
4 – Status
o actual sequence modulus
Sequence number modulus in use on the link. Until negotiation is
complete, this attribute has the value 128. However, if the value
of the characteristic sequence modulus is 8, the modulus always
appears as the value 8.
8 Indicates that modulo-8 numbering is in use.
128 Indicates that modulo-128 numbering is in use.
o interframe delay
Value: 0-109
Time required between frames to enable the local station to
successfully receive them.
o maximum pdu size
Value: 1-65535
Maximum frame size (in octets) that can be used on the link.
Until negotiation is complete, the value of this status attribute
is the same as the characteristic preferred maximum data size.
o negotiated crc type
CRC mode that has been negotiated with the remote station. This
mode will not be used until the station is next enabled. Until
negotiation is complete, the value of this is 16-bit.
o line type
Value: Switched or nonswitched
Defines whether the underlying physical line is switched or
nonswitched. This status affects the subset of port states that
are related to a given link.
o physical port
Name of the port in the Physical layer associated with the
communications link.
o response address
Address that the remote station puts in response frames.
o state
State of the HDLC link. This reflects the last enable or disable
command issued.
off The link is disabled.
on The link is enabled.
o window size
Value: 1-127
Maximum number of I-frames that can be outstanding before
an acknowledgment must be received. Until negotiation is
complete, the value of this status attribute is the same as the
characteristic preferred window size.
o uid
Entity's unique identifier, which is generated when the entity is
created.
5 – logical_station
show [node node-id] hdlc -
link link-name -
logical station station-name attribute [,attribute...]
all [attributes]
all counters
all identifiers
all status
Examples:
show hdlc link hdlc-0 logical station * all
show hdlc link hdlc-0 logical station * name, state
5.1 – Counters
o creation time
Time at which this entity was created.
o data octets received
Total number of octets received in the I-field of I-frames and
UI-frames. This total excludes protocol ID information in UI-
frames and frame retransmissions.
o data octets sent
Total number of octets sent in the I-field of I-frames and UI-
frames. This total excludes protocol ID information in UI-frames
and frame retransmissions.
o data pdus received
Total number of I-frames and UID-frames received. This number
does not include frames that had to be retransmitted.
o data pdus sent
Total number of I-frames and UID-frames sent. This number does
not include frames that had to be retransmitted.
o frmrs generated
Number of FRMRs (frame rejects) sent.
o frmrs received
Number of FRMRs (frame rejects) received.
o invalid mode commands
Number of command frames (SABME, SABM, SNRME, SNRM, SARM, and
SIM) received that are not applicable to this station.
o negotiation failures
Number of times that the XID negotiation with the remote station
has failed.
o polls received
Number of frames received with the poll bit set.
o rejs received
Number of REJ frames (rejects) received.
o rejs sent
Number of REJ frames (rejects) sent.
o rnrs received
Number of RNR (receive not ready) supervisory frames received
from the remote station.
o rnrs sent
Number of RNR (receive not ready) supervisory frames transmitted.
o times acknowledge timer expired
Number of times that the acknowledge timer has expired.
o times station halted
Number of times the station halt event has occurred.
o times station initializing
Number of times the station initialized event has occurred.
o times station inoperative
Number of times the entity's status attribute state became
inoperative.
o times station maintenance
Number of times the entity's status attribute state became
maintenance.
o times station resetting
Number of times that the station reset event has occurred.
o times station running
Number of times that the station running event has occurred.
o times station setup failed
Number of times the station setup failure event has occurred.
o unknown ui pdus received
Number of UI-frames the local station received whose protocol ID
does not match that of any open port.
o xids received
Number of XID (identification) command or response frames
received.
5.2 – Identifier
o name
Simple name assigned to the logical station when it is created.
5.3 – Status
o command address
Address the local station uses when sending command frames to the
remote station.
o maintenance mode
Whether the station is in maintenance mode. When set to true, the
station will be used exclusively for maintenance operations. When
set to false, the station operates in normal fashion.
The limit command sets the value of this attribute to true, and
the unlimit to false.
o protocol state
State of the data link protocol.
error A protocol error occurred. For instance, the
logical station received an invalid frame.
halted The protocol could not start. For example, there
is no client.
initializing The protocol is being initialized.
inoperative The protocol cannot be started because no contact
has been established with the remote station.
maintenance The logical station is in maintenance mode.
resetting The protocol is resetting after an error.
running The protocol is running and capable of exchanging
frames with the remote station.
o remote version
Version number of the HDLC protocol that the remote station is
using. This is received as part of an XID message from the remote
station.
o state
State of the logical station.
off The logical station is off because of a disable command.
on The logical station is on because of an enable command.
o uid
Entity's unique identifier, which is generated when the entity is
created.