634 | Virtual Router Redundancy Protocol (VRRP)
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In Figure 38-1, Router A is configured as the MASTER router. It is configured with the IP address of the
virtual router and sends any packets addressed to the virtual router through interface TenGigabitEthernet 1/
1 to the Internet. As the BACKUP router, Router B is also configured with the IP address of the virtual
router. If for any reason Router A becomes unavailable, VRRP elects a new MASTER Router. Router B
assumes the duties of Router A and becomes the MASTER router. At that time, Router B responds to the
packets sent to the virtual IP address.
All workstations continue to use the IP address of the virtual router to address packets destined to the
Internet. Router B receives and forwards them on interface Tengigabitethernet 10/1. Until Router A
resumes operation, VRRP allows Router B to provide uninterrupted service to the users on the LAN
segment accessing the Internet.
Figure 38-1. Basic VRRP Configuration
For more information about VRRP, refer to RFC 2338, Virtual Router Redundancy Protocol.
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