3Com 4210, 5500G, 4200G manual Host a Host C

186CHAPTER 20: VRRP CONFIGURATION GUIDE

■If both switches in the preemptive mode and switches in the non-preemptive mode exist in a VRRP group, the working mode of the VRRP group conforms to that of the master. For example, if the master works in the preemptive mode, when the master fails, the VRRP group will elect a new master through preemption although there are switches working in the non-preemptive mode.

Multiple VRRP Groups Multiple VRRP groups can implement the link backup and load sharing functions,

Configuration which can avoid communication interruption resulting from switch failure or traffic overburden on a link.

Network Diagram Figure 50 Network diagram for VRRP

Host B

10.2.3.1/24

Internet

Vlan-int3

10 .100.10.2/24

Switch A

Vlan-int2

202.38.160.1/24

Backup group1

Virtual IP address 202.38.160.111/24

Switch B

VLAN -int2

202.38.160.2/24

Backup group 2

Virtual IP address 202.38 .160.112/24

202.38.160.3/24

202.38.160.4/24

Networking and

Configuration

Requirements

Applicable Products

Host A Host C

A switch can backup multiple VRRP groups.

Multiple-VRRP group configuration can implement load sharing. For example, Switch A acts as the master of VRRP group 1 and a backup of VRRP group 2. Switch B acts as the master of VRRP group 2 and a backup of VRRP group 1. Some hosts in the network take VRRP group 1 as the gateway, while the others take VRRP group 2 as the gateway. In this way, both load sharing and mutual backup are implemented.

Product series	Software version	Hardware version
Switch 5500	Release V03.02.04	All versions
Switch 5500G	Release V03.02.04	All versions

Configuration Procedure ■ Configure Switch A.

# Configure VLAN 2.