3Com Router 3000 Ethernet FamilyConfiguration Guide Chapter 3 VRRP Configurations3Com Corporation3-11In normal circumstances, Router A functions as the gateway. When interface Serial2/0/0 on Router A becomes unavailable, the priority of Router A is reduced by 30, lowerthan that of Router B. Router B then preempts Router A to provide the gateway service.When interface Serial 2/0/0 on Router A recovers, the router resumes its gatewayfunction as the master.3.4.3 Configuring Multiple Standby GroupsI. Network requirementsV 2.41 allows one router to join multiple standby groups.You can implement load sharing by configuring multiple standby groups. For example,Router A may join standby group 1 as the master and standby group 2 as the backup,while Router B joins standby group 1 as the backup and standby group 2 as the master.By using them to provide the gateway service to different hosts, you can achieve loadsharing while having the routers back up each other.II. Network diagramSee Figure 3-3.III. Configuration procedureConfigure Router A:# Create standby group 1.[3Com-Ethernet1/0/0] vrrp vrid 1 virtual-ip 202.38.160.111# Set the priority of the standby group.[3Com-Ethernet1/0/0] vrrp vrid 1 priority 120# Create standby group 2.[3Com-Ethernet1/0/0] vrrp vrid 2 virtual-ip 202.38.160.112Configure Router B:# Create standby group 1.[3Com-Ethernet1/0/0] vrrp vrid 1 virtual-ip 202.38.160.111# Create standby group 2.[3Com-Ethernet1/0/0] vrrp vrid 2 virtual-ip 202.38.160.112# Set the priority of standby group 2.[3Com-Ethernet1/0/0] vrrp vrid 2 priority 120
