Configuring VRRP VRRP Configuration Overview
OmniSwitch AOS Release 8 Network Configuration Guide December 2017 page 23-11
address messages, both routers will begin forwarding packets sent to the virtual router MAC address.
This will result in the forwarding of duplicate packets.
• The backup VRRPv3 router will then take over and send a neighbor advertisement, which includes the
virtual router IPv6 address and the virtual router MAC address. In addition to creating duplicate IPv6/
MAC address messages, both routers will begin forwarding packets sent to the virtual router MAC
address. This will result in the forwarding of duplicate packets.
To avoid duplicate addresses and packets, make sure the advertisement interval is configured the same on
both the master and the backup router.
For more information about VRRP and ARP requests, see “ARP Requests” on page 23-6.
To configure the advertisement interval, use the vrrp or vrrp3 command option with the interval
keyword. For example:
-> vrrp 6 4 admin-state disable
-> vrrp 6 4 interval 5
-> vrrp3 10 5 admin-state disable
-> vrrp3 10 5 interval 500
In this example, VRRPv2 virtual router 6 and VRRPv3 virtual router 10 are disabled. (When modifying an
existing virtual router, the virtual router must be disabled before it may be modified.) The vrrp command
is then used to set the advertising interval for virtual router 6 to 5 seconds, and the vrrp3 command is then
used to set the advertising interval for virtual router 10 to 500 centiseconds. Optionally, you can also
preface the advertising keyword before interval.
Configuring Virtual Router Priority
VRRP functions with one master virtual router and at least one backup virtual router. A priority value
determines the role each router plays. It also decides the selection of backup routers for taking over as the
master router, if the master router is unavailable.
Priority values range from 1 to 255. A value of 255 indicates that the virtual router owns the IP address;
that is, the router contains the real physical interface to which the IP address is assigned. The switch can
change the default value and set it to 255 if it detects that the router is the IP address owner. The value
cannot be set to 255 if the router is not the IP address owner.
The IP address owner will always be the master router if it is available. If more than one backup router is
configured, their priority values should be configured with different values, so that the backup with the
higher value will take over for the master. The priority parameter may be used to control the order in
which backup routers will take over for the master. If priority values are the same, the master router is
selected as follows:
• VRRPv2 selects the backup virtual router with the highest physical interface IPv4 address to take over
for the master.
• VRRPv3 will select any backup virtual router to take over for the master.
– Note that the switch sets the priority value to zero in the last VRRPv3 advertisement packet before a
master router is disabled.
– If a router is the IPv6 address owner and the priority value is not set to 255, the switch will set its
priority to 255 when the router is enabled.
To set the priority, use the vrrp or vrrp3 command option with the priority keyword and the desired
value For example:
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