FTOS Configuration Guide for the C-Series - Force10 Networks

To view the virtual router’s configuration for preempt, use the show vrrp brief command in the EXEC
privilege mode. If the fourth column from the left contains a Y, then the preempt function is configured for
the VRRP group.
Figure 315 Command Example: show vrrp brief
Force10>show vrrp brief
Interface Grp Pri Pre State Master addr Virtual addr(s)
------------------------------------------------------------
Gi 12/3 1 105 Y Master 10.1.1.253 10.1.1.252
Gi 12/4 2 110 Y Master 10.1.2.253 10.1.2.252
Force10>
Change the advertisement interval
Every second the MASTER router transmits a VRRP advertisement to all members of the VRRP group
indicating it is up and is the MASTER router. If the VRRP group does not receive an advertisement, then
the election process begins, and the BACKUP virtual router with the highest priority transitions to
MASTER.
Note: Force10 Networks recommends that you keep the default setting for this command. If you
do change the time interval between VRRP advertisements on one router, you must change it on
all participating routers.
To change that advertisement interval, use the following command in the VRRP mode:
Command Syntax Command Mode Purpose
advertise-interval seconds CONFIG-INT-
(slot/port) -VRID
Track an interface
Change the default setting. The range for the
seconds value is from 1 to 255 seconds.
Default: 1 second
You can set FTOS to monitor the state of any interface by a virtual group. Each VRRP group can track up
to 12 interfaces, which may affect the priority of the VRRP group. If the state of the tracked interface goes
down, the VRRP group’s priority is decreased by a default value of 10 (also known as cost). If the tracked
interface’s state goes up, the VRRP group’s priority is increased by 10.
The lowered priority of the VRRP group may trigger an election. As the Master/Backup VRRP routers are
selected based on the VRRP group’s priority, tracking features ensure that the best VRRP router is the
Master for that group. The sum of all the costs of all the tracked interfaces should not exceed the
configured priority on the VRRP group. If the VRRP group is configured as Owner router (priority 255),
tracking for that group is disabled, irrespective of the state of the tracked interfaces. The priority of the
owner group always remains at 255.
438 Virtual Router Redundancy Protocol (VRRP)