FTOS Configuration Guide for the C-Series - Force10 Networks

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 GigabitEthernet 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 stops transferring packets, VRRP converges, and 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 GigabitEthernet 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.
While it is the MASTER router, Router B continues to perform its normal function: handling packets
between the LAN segment and the Internet.
Figure 309 Basic VRRP Configuration
10.10.10.0/24
LAN Segment
Interface gi 1/1
63.62.154.23
Router A
MASTER Router
Interface gi 1/0
10.10.10.1
Virtual IP Address
10.10.10.3
INTERNET
Virtual Router
Host A Host B Host C Host D
10.10.10.4 10.10.10.5 10.10.10.6 10.10.10.7
Interface gi 10/1
204.1.78.37
Router B
BACKUP Router
Interface gi 10/0
10.10.10.2
Host E
10.10.10.8
For more information on VRRP, refer to RFC 2338, Virtual Router Redundancy Protocol.
430 Virtual Router Redundancy Protocol (VRRP)
FN00023C