Enabling Udld - HP ProCurve Management And Configuration Manual

Port Status and Configuration
Uni-Directional Link Detection (UDLD)
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The following commands allow you to configure UDLD via the CLI.
Syntax: [no] interface <port-list> link-keepalive
Enables UDLD on a port or range of ports.
To disable the feature, enter the no form of the command.
Default: UDLD disabled
Syntax: link-keepalive interval <interval>
Determines the time interval to send UDLD control packets. The
<interval> parameter 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