Virtual Router Redundancy Protocol; Cli Examples - Dell PowerConnect M6220 Configuration Manual

Virtual Router Redundancy Protocol

When an end station is statically configured with the address of the router that will handle its routed
traffic, a single point of failure is introduced into the network. If the router goes down, the end station is
unable to communicate. Since static configuration is a convenient way to assign router addresses, Virtual
Router Redundancy Protocol (VRRP) was developed to provide a backup mechanism.
VRRP eliminates the single point of failure associated with static default routes by enabling a backup
router to take over from a "master" router without affecting the end stations using the route. The end
stations will use a "virtual" IP address that will be recognized by the backup router if the master router
fails. Participating routers use an election protocol to determine which router is the master router at any
given time. A given port may appear as more than one virtual router to the network, also, more than one
port on a switch may be configured as a virtual router. Either a physical port or a routed VLAN may
participate.

CLI Examples

This example shows how to configure the switch to support VRRP. Router 1 will be the default master
router for the virtual route, and Router 2 will be the backup router.
VLAN 50
Port 1/0/2
192.150.2.1
Virtual Router ID 20
Virtual Addr. 192.150.2.1
64
Routing Configuration
Layer 3 Switch acting
Layer 3 Switch acting
as Router 1
Hosts
as Router 2
Layer 2 Switch
VLAN 60
Port 1/0/4
192.150.4.1
Virtual Router ID 20
Virtual Addr. 192.150.2.1