Install Guide

Table Of Contents
VRRP in a VRF: Non-VLAN Scenario
The following example shows how to enable VRRP in a non-VLAN.
The following example shows a typical use case in which you create three virtualized overlay networks by configuring three
VRFs in two switches. The default gateway to reach the Internet in each VRF is a static route with the next hop being the
virtual IP address configured in VRRP. In this scenario, a single VLAN is associated with each VRF.
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.
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 174. VRRP in a VRF: Non-VLAN Example
Example of Configuring VRRP in a VRF on Switch-1 (Non-VLAN)
Example of Configuring VRRP in a VRF on Switch-2 (Non-VLAN Configuration)
VLAN Scenario
In another scenario, to connect to the LAN, VRF-1, VRF-2, and VRF-3 use a single physical interface with multiple tagged
VLANs (instead of separate physical interfaces).
In this case, you configure three VLANs: VLAN-100, VLAN-200, and VLAN-300. Each VLAN is a member of one VRF. A physical
interface ( ) attaches to the LAN and is configured as a tagged interface in VLAN-100, VLAN-200, and VLAN-300. The rest of
this example is similar to the non-VLAN scenario.
Virtual Router Redundancy Protocol (VRRP)
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