Dell Brocade DCX, Configuration Manual

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BigIron RX Series Configuration Guide 275
53-1001810-01
Displaying UDLD information
10
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.
When UDLD is enabled on a port, The UDLD starts sending the keep-alive messages at a
preconfigured interval. In the current implementation, if there is no keep-alive received from the
other end of this link after 3 retries then this port is set to logical link down. With the new design,
after the UDLD is enabled on a port, UDLD will be kept in a newly created suspended state until it
receives first keep-alive message from the other end. In this suspended state, UDLD will continue
to send the keep-alive message but will not bring the port down after maximum number of retries is
done and no keep-alive message is received from the other end. The UDLD will transition from this
suspended state to active state after it receives the 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.
Displaying UDLD information
Displaying information for all ports
To display UDLD information for all ports, enter the following command.
Syntax: show link-keepalive [ethernet <slot> / <portnum> ]
Displaying link-keepalive information
The show link-keepalive command will indicate the physical link and logical link as "UP" and the
link-keepalive as "init" when the first enabled link-keepalive on one end, and while its connected
peer has not enabled UDLD yet.
BigIron RX(config)# show link-keepalive
Total link-keepalive enabled ports: 4
Keepalive Retries: 5 Keepalive Interval: 1 Sec.
Port Physical Link Link-keepalive Logical Link
4/1 up up up
4/2 up up up
4/3 down down down
4/4 up down down