HP ProCurve Series 3400cl Release Notes page 94

Enhancements
Release M.10.09 Enhancements
Notes
■ 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 configuration (see page
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.
84
87 for potential problems).