Reference Guide

872 | Virtual Router Redundancy Protocol (VRRP)
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Figure 51-1 shows a typical network configuration using VRRP. Instead of configuring the hosts on the
network 10.10.10.0 with the IP address of either Router A or Router B as their default router; their default
router is the IP Address configured on the virtual router. When any host on the LAN segment wants to
access the Internet, it sends packets to the IP address of the virtual router.
In Figure 51-1 below, 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 51-1. Basic VRRP Configuration
10.10.10.4
10.10.10.5
10.10.10.6
10.10.10.0/24
LAN Segment
Interface gi 1/0
10.10.10.1
Virtual IP Address
10.10.10.3
Router A
Master Router
Virtual IP 10.10.10.3
Priority 255
Router B
Backup Router
Virtual IP 10.10.10.3
Priority 100
Interface gi 10/0
10.10.10.2
Interface gi 1/1
63.62.154.23
Interface gi 10/1
204.1.78.37
INTERNET
IP Addresses
Default Gateway
10.10.10.3 10.10.10.3 10.10.10.3
FN0001_lp
Virtual Router