Nortel Networks WEB OS 212777 - Manual (Page 254)

Web OS 10.0 Application Guide
254 n Chapter 11: High Availability
212777-A, February 2002
Active-Standby Redundancy
In an active-standby configuration, shown in Figure 11-4 , two Web switches are used. Both
switches support active traffic but are configured so that they do not simultaneously support
the same service. Each switch is active for its own set of services, such as IP routing interfaces
or load-balancing virtual server IP addresses, and acts as a standby for other services on the
other switch. If either switch fails, the remaining switch takes over processing for all services.
The backup switch may forward Layer 2 and Layer 3 traffic, as appropriate.
N OTE – In an active-standby configuration, the same service cannot be active simultaneously
on both switches.
Figure 11-4 Active-Standby Redundancy
Internet
Router
Router
Standby VIP 1
VIP: 205.178.13.226
Active VIP 1
VIP: 205.178.13.226
Active VIP 2
VIP: 205.178.13.240
Standby VIP 2
VIP: 205.178.13.240
Standby VIP 3
VIP: 205.178.13.110
Active VIP 3
VIP: 205.178.13.110
Active
Active