Brocade BigIron RX Series Configuration Guide - Manual (Page 360)

282 BigIron RX Series Configuration Guide
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Configuration considerations
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first keep-alive message from the other end. In the active state, UDLD peers will continue to
exchange keep alive messages periodically and if there are keep-alive messages are missed for
certain number of times from the other end, UDLD will bring down the logical port. The UDLD will
then transition from active to suspended state.
Everytime UDLD is enabled on a port, the port will be transitioned into the suspended state to
detect if the other end (peer) supports UDLD. This include the case where:
• User enables UDLD on a port
• A port that has UDLD enabled coming back up after an system reboot
• Port was brought down by UDLD after uni-directional link was detected and now the problem is
fixed.
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).