R3204P16-HP Load Balancing Module High Availability Configuration Guide-6PW101

VRRP configuration

NOTE:

• The term

router

in this document refers to a network device running a routing protocol.

• The interfaces that VRRP involves can only be Layer 3 Ethernet interfaces and VLAN interfaces unless

otherwise specified.

• You cannot configure VRRP on an interface of an aggregation group.

• VRRP includes VRRPv2 and VRRPv3. VRRPv2 is based on IPv4, and VRRPv3 is based on IPv6. The web

interface supports only IPv4 VRRP configuration.

Overview

Typically, as shown in Figure 1, you can configure a default route with the gateway as the next hop for

every host on a network segment. All packets destined to other network segments are sent over the

default route to the gateway and then 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 external network.

Figure 1 LAN networking

Configuring a default route for network hosts facilitates your configuration, but also requires high

performance stability of the device acting as the gateway. Using more egress gateways is a common

way to improve system reliability, introducing the problem of routing among the multiple egresses.

Virtual Router Redundancy Protocol (VRRP) is designed to address this problem. VRRP adds routers that

can act as network gateways to a VRRP group, which forms a virtual router. Routers in the VRRP group

elect a master through the VRRP election mechanism to take the responsibility of a gateway, and hosts on

a LAN only need to configure the virtual router as their default network gateway.

VRRP is an error-tolerant protocol, which improves the network reliability and simplifies configurations on

hosts. Deploying VRRP on multicast and broadcast LANs such as Ethernet, you can ensure that the system

can still provide highly reliable default links without changing configurations (such as dynamic routing