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1150 | Virtual Router Redundancy Protocol (VRRP)
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Both Switch-1 and Switch-2 have three VRF instances defined: VRF-1, VRF-2, and VRF-3. Each VRF has
a separate physical interface to a LAN switch and an upstream VPN interface to connect to the Internet.
Both Switch-1 and Switch-2 use VRRP groups on each VRF instance in order that there is one master and
one backup router for each VRF. In VRF-1 and VRF-2, Switch-2 serves as owner-master of the VRRP
group and Switch-1 serves as the backup. On VRF-3, Switch-1 is the owner-master and Switch-2 is the
backup.
Note that in VRF-1 and VRF-2 on Switch-2, the virtual IP and node IP address, subnet, and VRRP group
are the same. On Switch-1, the virtual IP address, subnet, and VRRP group are the same in VRF-1 and
VRF-2, but the IP address of the node interface is unique. There is no requirement for the virtual IP and
node IP addresses to be the same in VRF-1 and VRF-2; similarly, there is no requirement for the IP
addresses to be different. In VRF-3, the node IP addresses and subnet are unique.
Figure 58-26. VRRP in VRF: Switch-1 Non-VLAN Configuration
Switch-1
S1(conf)#ip vrf default-vrf 0
!
S1(conf)#ip vrf VRF-1 1
!
S1(conf)#ip vrf VRF-2 2
!
S1(conf)#ip vrf VRF-3 3
!
S1(conf)#interface GigabitEthernet 12/1
S1(conf-if-gi-12/1)#ip vrf forwarding VRF-1
S1(conf-if-gi-12/1)#ip address 10.10.1.5/24
S1(conf-if-gi-12/1)#vrrp-group 11
% Info: The VRID used by the VRRP group 11 in VRF 1 will be 177.
S1(conf-if-gi-12/1-vrid-101)#priority 100
S1(conf-if-gi-12/1-vrid-101)#virtual-address 10.10.1.2
S1(conf-if-gi-12/1)#no shutdown
!
S1(conf)#interface GigabitEthernet 12/2
S1(conf-if-gi-12/2)#ip vrf forwarding VRF-2
S1(conf-if-gi-12/2)#ip address 10.10.1.6/24
S1(conf-if-gi-12/2)#vrrp-group 11
% Info: The VRID used by the VRRP group 11 in VRF 2 will be 178.
S1(conf-if-gi-12/2-vrid-101)#priority 100
S1(conf-if-gi-12/2-vrid-101)#virtual-address 10.10.1.2
S1(conf-if-gi-12/2)#no shutdown
!
S1(conf)#interface GigabitEthernet 12/3
S1(conf-if-gi-12/3)#ip vrf forwarding VRF-3
S1(conf-if-gi-12/3)#ip address 20.1.1.5/24
S1(conf-if-gi-12/3)#vrrp-group 15
% Info: The VRID used by the VRRP group 15 in VRF 3 will be 243.
S1(conf-if-gi-12/3-vrid-105)#priority 255
S1(conf-if-gi-12/3-vrid-105)#virtual-address 20.1.1.5
S1(conf-if-gi-12/3)#no shutdown