Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide - Manual (Page 124)

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.
device(config)#link-keepalive interval 4
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
By default, a port waits one second to receive a health-check reply packet from the port at the other
end of the link. If the port does not receive a reply, the port tries four more times by sending up to four
more health-check packets. If the port still does not receive a reply after the maximum number of
retries, the port goes down.
You can change the maximum number of keepalive attempts to a value from 3 - 64. To change the
maximum number of attempts, enter a command such as the following.
device(config)#link-keepalive retries 10
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 - 64. The default is 7.
Displaying UDLD information
This section describes the commands used to display information about a UDLD configuration.
Displaying information for all ports
To display UDLD information for all ports, enter the following command.
device#show link-keepalive
Total link-keepalive enabled ports: 4
Keepalive Retries: 3 Keepalive Interval: 1 Sec.
Port Physical Link Logical Link State Link-vlan
4/1 up up FORWARDING 3
4/2 up up FORWARDING
4/3 down down DISABLED
4/4 up down DISABLED
Syntax: show link-keepalive
CLI display of UDLD information TABLE 24
Field Description
Total link-keepalive enabled
ports The total number of ports on which UDLD is enabled.
Changing the Keepalive interval
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