3Com Router Command Reference — V1.00VRRP stipulates that the backup groups of an interface should use the sameauthentication type and authentication key. Therefore, after the command isconfigured on an Ethernet interface, all the VRRP backup groups on the interface willenable authentication.In addition, the members in the same backup group should have the sameauthentication type and authentication key.Example# Set the authentication types and authentication keys of all VRRP backup groups atinterface Ethernet 0.[3Com-Ethernet0]vrrp authentication-mode simple 3Com2.1.4 vrrp vrid preempt-modeSyntaxvrrp vrid virtual_router_id preempt-mode [ timer-delay seconds ]undo vrrp vrid virtual_router_id preempt-modeViewEthernet interface viewParametervirtual_router_id: Virtual Router ID, namely, VRRP backup group number, rangingfrom 1 to 255.timer-delay seconds: Delay time in seconds with a value ranging from 1 to 255.DescriptionUsing the vrrp vrid preempt-mode command, you can configure the preemptionmode and delay time of routers in a VRRP backup group. Using the undo vrrp vridpreempt-mode command, you can restore the default value of the preemption modeand delay time.By default, preempt without delay.If a router with a higher priority is needed to actively preempt as the MASTER, therouter should be set to preemption mode. If more time is needed for preemption, thedelay time can be set.12
