Displays the status and LAT characteristics of links on the local
node.
Format
SHOW LINK [link-name]
1 – Parameter
link-name
Specifies the name for a LAT data link. A link name can have up
to 16 ASCII characters.
If you do not specify a link name, LATCP displays information
about all links currently defined for the node.
2 – Qualifiers
2.1 /BRIEF
Displays the device name and state of the link. This is the
default display.
2.2 /COUNTERS
Displays the device counters kept for the link. The numbers
displayed represent the values recorded since the last time the
counters were reset (when the node first started or when the ZERO
COUNTERS command was used).
Do not use the /BRIEF or /FULL qualifier with this qualifier.
Counters Common to CSMA/CD and FDDI Links lists and describes
counters common to both CSMA/CD (carrier sense, multiple
access with collision detect) and FDDI (fiber distributed data
interface) links.
Table 1 Counters Common to CSMA/CD and FDDI Links
Counter Description
Messages received The total number of messages received over the
link.
Multicast The total number of multicast messages
messages received received over the link.
Bytes received The total number of bytes of information
received over the link.
Multicast bytes The total number of multicast bytes received
received over the link.
System buffer The total number of times no system buffer was
unavailable available for an incoming frame.
Unrecognized The total number of times a frame was
destination discarded because there was no portal with
the protocol enabled. This count includes
frames received for the physical address only.
Messages sent The total number of messages sent over the
link.
Multicast The total number of multicast messages sent
messages sent over the link.
Bytes sent The total number of bytes of information sent
over the link.
Multicast bytes The total number of bytes of multicast
sent messages sent over the link.
User buffer The total number of times no user buffer was
unavailable available for an incoming frame that passed
all filtering.
Data overrun The total number of bytes lost on the link's
device because the local node's input buffers
were full. A nonzero value can indicate noisy
lines, a bad device, a busy or poorly tuned
system (not enough resources allocated), or
a hardware problem with another device on the
LAN connection.
Receive Errors Common to CSMA/CD and FDDI Links lists and
describes receive errors common to both CSMA/CD and FDDI links.
These errors, which are included in the display generated by
the SHOW LINK/COUNTERS command, are represented by flags that
indicate the error has occurred.
Table 2 Receive Errors Common to CSMA/CD and FDDI Links
Flag Description
Block check error CRC error in packet(s) received.
Framing error Received frame(s) ended incorrectly.
Frame too long Frame(s) received longer than length limits.
Frame status CRC error on ring noticed by local FDDI
error station (FDDI only).
Frame length Frame length too short (FDDI only).
error
Transmit Errors Common to CSMA/CD and FDDI Links lists and
describes transmit errors common to both CSMA/CD and FDDI links.
These errors, which are included in the display generated by
the SHOW LINK/COUNTERS command, are represented by flags that
indicate the error has occurred.
Table 3 Transmit Errors Common to CSMA/CD and FDDI Links
Flag Description
Excessive Frame(s) failed to transmit because the
collisions collision limit of 16 was reached (CSMA/CD
only).
Carrier check Indicates transceiver problem or short circuit
failures in cable.
Short circuit Short circuit in cable.
Open circuit Open circuit in cable.
Frame too long Frame(s) too long. Indicates a transmission
problem in one of the portals using the link.
Remote failure to A remote station failed to defer frame(s)
defer transmission. Could indicate a misconfigured
network.
Transmit underrun Transmission of a frame was too slow.
Indicates a hardware controller error.
Transmit failure Frame(s) failed to transmit.
CSMA/CD Counters lists and describes link counters specific to
CSMA/CD only.
Table 4 CSMA/CD Counters
Counter Description
Transmit CDC The total number of carrier detect check
failure errors, that is, the number of times the local
node failed to detect that another Ethernet
station was already transmitting when the
local node began transmitting.
Messages Single collision-The total number of times
transmitted: a frame was successfully transmitted on the
second attempt after a normal collision on the
first attempt.
Multiple collision-The total number of times
a frame was successfully transmitted on the
third or later attempt after normal collisions
on previous attempts.
Initially deferred-The total number of times
a frame transmission was deferred on its
first attempt. This counter is used to measure
Ethernet contention with no collisions.
FDDI Counters lists and describes link counters specific to FDDI
only.
Table 5 FDDI Counters
Counter Description
Ring initializations The total number of times a ring
initiated reinitialization was initiated by the
link.
Ring initializations The total number of times a ring
received reinitialization was initiated by some
other link.
Directed beacons The number of times the link detected the
received directed beacon process. Each invocation
of the directed beacon process is counted
only once.
Connections completed The number of times the station
successfully connected to the
concentrator.
Duplicate tokens The number of times a duplicate token was
detected detected on the link.
Ring purge errors The number of times the ring purger
received a token while still in the ring
purge state.
LCT rejects Link Confidence Test rejects. Indicates a
problem with communication between station
and concentrator.
Elasticity buffer Elasticity buffer function errors.
errors Indicates a station on the ring with a
transmit clock out of tolerance.
MAC error count The number of times the MAC (Media Access
Control) changed the E indicator in a
frame from R to S.
Traces initiated The number of times the PC-trace process
was initiated by the link.
Traces received The number of times the link was requested
to perform the PC-trace process.
Ring beacons The number of times the ring beacon
initiated process was initiated by the link.
Link errors The number of times the Link Error Monitor
(LEM) detected an error in a received
message. Slow counts are normal.
Duplicate address The number of times the link address was a
test failures duplicate.
FCI strip errors The number of times a Frame Content
Independent Strip operation was terminated
by receipt of a token.
LEM rejects The number of times excessive LEM errors
were encountered.
MAC frame count The total number of frames (other than
tokens) seen by the link.
MAC lost count The total number of times a frame (other
than a token) was improperly terminated.
2.3 /FULL
Displays the device name, state, and datalink address of the link
and indicates whether the DECnet address is enabled.
3 – Examples
1.LATCP> SHOW LINK/FULL NETWORK_A
The SHOW LINK command in this example produces the following
display of information about link NETWORK_A:
Link Name: NETWORK_A Datalink Address: 08-00-2B-10-12-E3
Device Name: _ESA7: DECnet Address: Disabled
Link State: On
The display in this example gives the device name of link
NETWORK_A and the device's hardware address. The link is in
the On state.