Virtual Router Redundancy Protocol; Cli Examples - Dell POWERCONNECT 6200 SERIES 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
router to take over from a
virtual
stations will use a
Participating routers use an election protocol to determine which router is the master router at any given
time. A given VLAN routing interface may appear as more than one virtual router to the network. Also,
more than one VLAN routing interface on a switch may participate in a virtual router.

CLI Examples

This example shows how to configure the switch to support VRRP. Router 1 is the default master router
for the virtual route, and Router 2 is the backup router.
NOTE:
The VRRP IP address on a routing interface must belong to the same subnet (primary or secondary) as the IP
address (primary or secondary) configured on that routing interface; otherwise, an error message displays and the
VRRP IP configuration fails. The master and backup VLAN routing interfaces must be in the same subnet and be
members of the same VLAN.
Layer 3 Switch acting
as Router 1
VLAN 50
IP Address 192.150.2.1
Virtual Router ID 20
Virtual IP: 192.150.2.1
Figure 4-2. VRRP Example Network Configuration
master
router without affecting the end stations using the route. The end
IP address that is recognized by the backup router if the master router fails.
` `
Layer 3 Switch acting
as Router 2
VLAN 50
IP Address 192.150.2.20
Layer 2 Switch
Virtual Router ID 20
Virtual IP: 192.150.2.1
`
backup
Hosts
`
Routing Configuration
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