Web OS 10.0 Application Guide8 n Contents 212777-A, February 2002Chapter 11: High Availability 247VRRP Overview 248VRRP Components 248VRRP Operation 251Selecting the Master VRRP Router 251Active-Standby Failover 252Failover Methods 253Active-Standby Redundancy 254Active-Active Redundancy 255Hot-Standby Redundancy 256Synchronizing Configurations 258Web OS Extensions to VRRP 259Virtual Server Routers 259Sharing/Active-Active Failover 260Tracking VRRP Router Priority 261High Availability Configurations 263Active-Standby Virtual Server Router Configuration 263Active-Active VIR and VSR Configuration 265Active/Active Server Load Balancing Configuration 267VRRP-Based Hot-Standby Configuration 275Virtual Router Deployment Considerations 277Mixing Active-Standby and Active-Active Virtual Routers 277Synchronizing Active/Active Failover 277Eliminating Loops with STP and VLANs 278Assigning VRRP Virtual Router ID 280Configuring the Switch for Tracking 280Synchronizing Configurations 282Stateful Failover of Layer 4 and Layer 7 Persistent Sessions 283What Happens When a Switch Fails 284Viewing Statistics on Persistent Port Sessions 286
