1-11 VRRP ConfigurationWhen configuring VRRP, go to these sections for information you are interested in:z VRRP Overviewz VRRP Standard Protocol Modez Configuring VRRP for IPv4z IPv4-Based VRRP Configuration Examplesz Troubleshooting VRRPz The term router in this document refers to a router in a generic sense or a Layer 3 switch.z At present, the interfaces that VRRP involves can only be VLAN interfaces.+VRRP OverviewNormally, as shown in Figure 1-1, you can configure a default route with the gateway as the next hop forevery host on a network segment. All packets destined to other network segments are sent over thedefault route to the gateway and then be forwarded by the gateway. However, when the gateway fails,all the hosts using the gateway as the default next-hop router fail to communicate with the externalnetwork.Figure 1-1 LAN networkingGatewayNetworkHost AHost BHost CConfiguring a default route for network hosts facilitates your configuration, but also requires highperformance stability of the device acting as the gateway. Using more egress gateways is a commonway to improve system reliability, introducing the problem of routing among the multiple egresses.
