Keeps the port in a logically blocked state until the link configured for UDLD has been successfully established in
bi-directional communication.
Syntax:
Switch(config)# link-keepalive mode forward-then-verify
Forwards the data then verifies the status of the link. If a unidirectional state is detected, the port is then moved to
a blocked state.
Syntax:
Switch(config)# link-keepalive interval <deciseconds>
Configure the interval for
link-keepalive
. The
link-keepalive
interval is the time between sending two
UDLD packets. The time interval is entered in deciseconds (1/10 sec). The default keepalive interval is 50
deciseconds.
Example:
A value of 10 is 1 sec., 11 is 1.1 sec.
Syntax:
Switch(config)# link-keepalive retries <number>
Maximum number of sending attempts for UDLD packets before declaring the link as faulty.
Default keepalive attempt is 4.
Show commands
Syntax:
switch(config)# show link-keepalive
Sample output:
Total link-keepalive enabled ports: 8
Keepalive Retries : 4
Keepalive Interval: 5 sec
Keepalive Mode : verify-then-forward
Physical Keepalive Adjacent UDLD
Port Enabled Status Status Switch VLAN
----- ------- ---------------- --------- ------------- ----------
1 Yes down off-line 000000-000000 untagged
2 Yes down off-line 000000-000000 untagged
3 Yes down off-line 000000-000000 untagged
4 Yes down off-line 000000-000000 untagged
5 Yes down off-line 000000-000000 untagged
6 Yes down off-line 000000-000000 untagged
7 Yes down off-line 000000-000000 untagged
8 Yes down off-line 000000-000000 untagged
RMON generated when user changes UDLD mode
RMON events are generated when UDLD is configured. The first time you configure the mode, the UDLD states
will be re-initialized. An event log entry is initiated to include the reason for the initial UDLD blocking state during
link up.
Example:
UDLD mode
[verify-then-forward | forward-then-verify]
is configured
Chapter 7 Configuring for Network Management Applications
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