HP 2910AL - Manual (Page 247)

Port Status and Configuration
Uni-Directional Link Detection (UDLD)
N o t e s ■ You must configure the same VLANs that will be used for UDLD on
all devices across the network; otherwise, the UDLD link cannot be
maintained.
■ If a VLAN ID is not specified, then UDLD control packets are sent out
of the port as untagged packets.
■ To re-assign a VLAN ID, re-enter the command with the new VLAN ID
number. The new command will overwrite the previous command
setting.
■ When configuring UDLD for tagged ports, you may receive a warning
message if there are any inconsistencies with the port’s VLAN config­
uration (see page 36 for potential problems).
Viewing UDLD Information
The following show commands allow you to display UDLD configuration and
status via the CLI.
Syntax: show link-keepalive
Displays all the ports that are enabled for link-keepalive.
Syntax: show link-keepalive statistics
Displays detailed statistics for the UDLD-enabled ports on the
switch.
Syntax: clear link-keepalive statistics
Clears UDLD statistics. This command clears the packets sent,
packets received, and transitions counters in the show link­
keepalive statistics display.
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