3Com 4007 Implementation Manual

Also see for 4007: Getting started guide Important notice Release note Command reference guide Product guide

Contents

3Com 4007 Implementation Manual Manual pdf 411 page image

Using VRRP On Your Switch 4007 411VRRP Activity If the entire BA2 module goes down, then both Backup virtual routers onBA1 switch over to Master and the end stations’ ability to address oneanother on LAN1 (the switch fabric module) and to address the endstations on LAN2 (external switch) is maintained.However, if only one of the Primary routers goes down, this addressingability between the LAN1 end stations and the LAN2 end stations is lostwithout RIP-2 or OSPF running.Sequence of Failover EventsSuppose the link between the backbone BA2 front panel port and theExternal switch goes down. The following events occur:1 VRRP switches over to Backup, preserving addressability between endstations on LAN2.2 The Master router for LAN2 (External Switch) becomes the front panelport of the BA1.3 The Master router for LAN1 (the switch fabric module) remains thebackplane port of the BA2.However, successful recovery of operations depends upon the status ofthe dynamic routing protocols (RIP-2 or OSPF):Without RIP-2 or OSPF: Addressability between the LAN1 endstations and the LAN2 end stations is lost.n The backplane port of BA2 remains the default gateway for theLAN1-connected end stations.n The front panel port of BA1 becomes the default gateway for theLAN2-connected end stations.