Dell PowerConnect B-RX - Configuration Considerations; Configuring UDLD; Changing the Keepalive Interval; Changing the Keepalive Retries

282 BigIron RX Series Configuration Guide
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Configuration considerations
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Configuration considerations
• The feature is supported only on Ethernet ports.
• To configure UDLD on a trunk group, you must configure the feature on each port of the group
individually. Configuring UDLD on a trunk group’s primary port enables the feature on that port
only.
• Dynamic trunking is not supported. If you want to configure a trunk group that contains ports
on which UDLD is enabled, you must remove the UDLD configuration from the ports. After you
create the trunk group, you can re-add the UDLD configuration.
Configuring UDLD
To enable UDLD on a port, enter a command such as the following at the global CONFIG level of the
CLI.
BigIron RX(config)# link-keepalive ethernet 1/1
Syntax: [no] link-keepalive ethernet <slot>/<portnum> [ethernet <slot>/<portnum>]
To enable the feature on a trunk group, enter commands such as the following.
BigIron RX(config)# link-keepalive ethernet 1/1 ethernet 1/2
BigIron RX(config)# link-keepalive ethernet 1/3 ethernet 1/4
These commands enable UDLD on ports 1/1 – 1/4. You can specify up to two ports on the same
command line.
Changing the keepalive interval
By default, ports enabled for UDLD send a link health-check packet once every 500 ms. You can
change the interval to a value from 1 – 60, where 1 is 100 ms, 2 is 200 ms, and so on. To change
the interval, enter a command such as the following.
BigIron RX(config)# link-keepalive interval 3
Syntax: [no] link-keepalive interval <num>
The <num> parameter specifies how often the ports send a UDLD packet. You can specify from 1
– 60, in 100 ms increments. The default is 5 (500 ms).
Changing the keepalive retries
You can change the maximum number of keepalive attempts to a value from 3 – 10. To change the
maximum number of attempts, enter a command such as the following.
BigIron RX(config)# link-keepalive retries 4
Syntax: [no] link-keepalive retries <num>
The <num> parameter specifies the maximum number of times the port will try the health check.
You can specify a value from 3 – 10. The default is 5.