HP ProCurve J8766A Release Note page 32

Enhancements
Release L.10.07 Enhancements
Determines the time interval to send UDLD control packets. The <interval> param-
eter specifies how often the ports send a UDLD packet. You can specify from 10 –
100, in 100 ms increments, where 10 is 1 second, 11 is 1.1 seconds, and so on.
Default: 50 (5 seconds)
Syntax: link-keepalive retries <num>
Determines the maximum number of retries to send UDLD control packets. The
<num> parameter specifies the maximum number of times the port will try the health
check. You can specify a value from 3 – 10.
Default: 5
Syntax: [no] interface <port-list> link-keepalive vlan <vid>
Assigns a VLAN ID to a UDLD-enabled port for sending of tagged UDLD control
packets.Under default settings, untagged UDLD packets can still be transmitted and
received on tagged only ports—however, a warning message will be logged.
The no form of the command disables UDLD on the specified port(s).
Default: UDLD packets are untagged; tagged only ports will transmit and receive
untagged UDLD control packets
Enabling UDLD. UDLD is enabled on a per port basis. For example, to enable UDLD on port a1,
enter:
ProCurve(config)#interface al link-keepalive
To enable the feature on a trunk group, enter the appropriate port range. For example:
ProCurve(config)#interface al-a4 link-keepalive
Note
When at least one port is UDLD-enabled, the switch will forward out UDLD packets that arrive on
non-UDLD-configured ports out of all other non-UDLD-configured ports in the same vlan. That is,
UDLD control packets will "pass through" a port that is not configured for UDLD. However, UDLD
packets will be dropped on any blocked ports that are not configured for UDLD.
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