46 CONFIGURING VRRP
This chapter covers the following topics:
■VRRP Overview
■Configuring VRRP
■Displaying and Debugging VRRP
■VRRP Configuration Examples
■Troubleshooting VRRP
VRRP Overview Virtual Router Redundancy Protocol (VRRP) is a fault-tolerant protocol. In general,
a default route (the next hop is 10.100.10.1) is configured for a network host so
that packets sent by the host with destination addresses not in the local network
segment go through the default route to Router 1 to implement communication
between the host and the external network. When Router 1 breaks down, in this
network segment all the hosts that regard Router 1 as the default route next-hop
stop the communication with the external network.
Figure 207 LAN networking scheme
To solve this problem, VRRP is designed for LANs with multi-casting and
broadcasting capabilities, such as Ethernet. VRRP combines a group of LAN routers
including a MASTER router and several BACKUP routers into a virtual router, called
a standby group.
PCPCPC
Router
Ethernet
10.10.100.1
Network