Example for Configuring VRRP to Implement Gateway Redundancy

Created Dec 17, 2016 23:30:17Latest reply Dec 26, 2016 16:51:28 1086 1 0 0

Applicability

This example applies to all versions and AR routers.


Networking Requirements

As shown in Figure1,Host A communicates with Host B through the default gateway. RouterA and RouterB form a VRRP group, which functions as the default gateway of Host A.

RouterA serves as the master router, and RouterB functions as the backup router. When RouterA fails, RouterB functions as the gateway.

After RouterA is restored, it becomes the master router within 20 seconds by preemption.

Figure 1  VRRP backup group in master/backup mode
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Procedure

  1. Configure RouterA.

  2. Configure RouterB.

  3. Verify the configuration.

    Run the display vrrp command on RouterA to check the status of Ethernet1/0/0 in the VRRP group. Ethernet1/0/0 is in master state.

    Run the display vrrp command on RouterB to check the status of Ethernet1/0/0 in the VRRP group. Ethernet1/0/0 is in backup state.


Configuration Notes

  • Configure the same virtual IP address for RouterA and RouterB.
  • Configure priorities for RouterA and RouterB to determine the master/backup routers in the VRRP group. By default, the priority of a router is 100, and a larger value indicates a higher priority.
  • Host B must have reachable routes to RouterA and RouterB.

 

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user_2790689  Expert   Created Dec 26, 2016 16:51:28 Helpful(0) Helpful(0)

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