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Active-standby redundancy, Active-standby redundancy 254, Figure 11-4: active-standby redundancy 254 – Nortel Networks WEB OS 212777 User Manual

Page 254

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Web OS 10.0 Application Guide

254

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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