Configuring VRRP VRRP Configuration Overview
OmniSwitch AOS Release 7 Network Configuration Guide June 2013 page 22-13
lower priority backup to assume control before a higher priority backup. But when the preempt mode is
enabled, the higher priority backup router will detect this and assume control.
Note. In certain cases, this may not be a desirable behavior, as when the original master comes back and
immediately causes all the traffic to switch back to it.
If all virtual routers have the preempt mode enabled, the virtual router with the highest priority will
become the master. If the master router goes down, the highest priority backup router will become the
master. If the previous master or any other virtual router comes up with the preempt mode enabled and has
a higher priority value, this router will become the new master.
To prevent a router with a higher priority value from automatically taking control from a master router
with a lower priority value, disable the preempt mode for the higher priority router. This is done by using
the no preempt keywords with the vrrp command (vrrp preempt). For example:
-> vrrp 6 4 admin-state disable
-> vrrp 6 4 no preempt
Note. The virtual router that owns the IP address(es) associated with the physical router always becomes
the master router if it is available, regardless of the preempt mode setting and the priority values of the
backup routers.
In the above example, the first command administratively disables virtual router 6. (If you are modifying
an existing virtual router, it must be disabled before it is modified.). The second command disables the
preempt mode for the same router. Henceforth, router 6 will not preempt another virtual router with a
lower priority. For more information about priority, see “Configuring Virtual Router Priority” on
page 22-12.
Enabling/Disabling a Virtual Router
To enable a virtual router, use the vrrp command with the enable keyword. Note that at least one IP
address must be configured for the virtual router through the vrrp address command. For example:
-> vrrp 7 3 priority 150
-> vrrp 7 3 address 10.10.2.3
-> vrrp 7 3 admin-state enable
In this example, a virtual router is created on VLAN 3 with a VRID of 7. An IP address is then assigned to
the virtual router. The virtual router is then enabled on the switch.
To disable a virtual router, use the disable keyword.
-> vrrp 7 3 admin-state disable
A virtual router must be disabled before it may be modified. Use the vrrp command to disable the virtual
router first; then use the command again to modify the parameters. For example:
-> vrrp 7 3 admin-state disable
-> vrrp 7 3 priority 200
-> vrrp 7 3 admin-state enable
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