Displaying Udld Information; Displaying Information For All Ports; Displaying Link-Keepalive Information - Dell PowerConnect B-RX Configuration Manual

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.
BigIron RX(config)# show link-keepalive
Total link-keepalive enabled ports: 4
Keepalive Retries: 5
Port
4/1
4/2
4/3
4/4
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.
In this example, the port has been brought down by UDLD. Notice that in addition to the
information in the first line, the port state on the fourth line of the display is listed as DISABLED.
BigIron RX(config)#sh link-keepalive
Total link-keepalive enabled ports: 2
Keepalive Retries: 5
Port
1/15
2/15
Syntax: show link-keepalive
BigIron RX Series Configuration Guide
53-1002253-01
Keepalive Interval: 1 Sec.
Physical Link Link-keepalive
up up
up up
down down
up down
Keepalive Interval: 5 * 100 MilliSec.
Physical Link Link-keepalive
up init
up init
Displaying UDLD information
Logical Link
up
up
down
down
Logical link
up
up
10
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