Web OS 10.0 Application Guide252 n Chapter 11: High Availability 212777-A, February 2002Active-Standby FailoverThe previous text described the use of a group of VRRP routers to form a single virtual inter-face router. It implements a traditional hot-standby configuration in which the backup routeronly functions when the active router has failed. VRRP can also be used to implement active-standby configurations. In an active-standby configuration, both switches support active traf-fic, but are configured so that they do not simultaneously support the same service.In the example shown in Figure 11-2, Web switch 1 is the master for the virtual interface routerwith VRID = 1, and its backup for the virtual interface router with VRID = 2. Web switch 2 ismaster for the virtual interface router with VRID = 2 and backup for the virtual interface routerwith VRID = 1. In this manner, both routers can actively forward traffic at the same time butnot for the same interface.Figure 11-2 Example 2: VRRP RouterTable 11-1 Active Standby ConfigurationVRID = 1 VRID = 2Web Switch 1 Router #1 = Master ActiveVR IP address = 205.178.13.226MAC address = 00.00.SE.00.01.01Priority = 255IP interface = 205.178.13.226Router #1 = Backup StandbyVR IP address = 205.178.13.240MAC address = 00.00.SE.00.01.02Priority = 100IP interface = 205.178.13.239Web Switch 2 Router #2 = Backup StandbyVR IP address = 205.178.13.226MAC address = 00.00.SE.00.01.01Priority = 100IP interface = 205.178.13.225Router #1 = Master ActiveVR IP address = 205.178.13.240MAC address = 00.00.SE.00.01.02Priority = 255IP interface = 205.178.13.240InternetRouterRouter VRID = 1Router #2 = Backup StandbyVRID = 1Router #1 = Master ActiveHost #1Default Gateway205.178.13.226Host #2Default Gateway205.178.13.240Web Switch 1Web Switch 2VRID = 2Router #2 = Master ActiveVRID = 2Router #1 = Backup Standby
