Introduced
1, generally, a network segment all hosts are configured with the same default route to the gateway as the next hop. When the gateway fails, all the hosts to the gateway as a default route of the host can not communicate with the outside.
2, break through the network LAN gateway VRRP can avoid the single point of failure caused.
VRRP Overview
1, if the gateway fails, the network device can not access the Internet.
2, VRRP may be added to the backup set of the plurality of routers form a virtual router, gateway functions bear.
3, as long as the backup group is still a route to work, virtual routing will still work.
4, VRRP router can undertake multiple tasks, the formation of multiple virtual routers share the traffic between the internal network and the external network.
VRRP Overview
1, RFC 3768 defined VRRPv2 is a fault tolerant protocol, while improving reliability and simplifies the configuration of the host.
2, VRRP protocol packets multicast address 224.0.0.18 fixed transmission.
3, the virtual router on the LAN has a unique Virtual Router ID logo. And having a virtual MAC address: 00-00-5E-00-01- {vrid}.