Avaya P333R-LB Manuel D’Utilisation

Chapter 13

Layer 3 Redundancy

Avaya 

P333R-LB User’s Guide

125

You can configure a Real Server to serve as a backup for one or more primary Real 
Servers in a Real Server Group.
As with RSG, a Real Server can backup a primary Real Server but not a backup Real 
Server. In addition, you cannot have two Real Servers backing up each other.
Unlike a backup RSG, a backup Real Server cannot provide another service while 
supplying backup to the primary Real Server. Although the backup Real Server will 
be completely dormant while the primary Real Server is active, its Health will be 
periodically checked.
A backup Real Server will not be used until the primary Real Server is down.

A backup Real Server cannot be a part of an RSG.

When the primary Real Server has recovered, it will resume operation and begin to 
receive new sessions. Ongoing sessions will continue going to the backup Real 
Server until they are completed. In addition, to keep persistency, new sessions 
might open to the backup Real Server.

Real Server Backup Configuration Example

The following figure illustrates a Real Server Backup configuration.

193.170.1.1

WAN

Edge Router

P333R-LB

VIP=193.170.1.3

Real Server 1
10.1.1.1

Real Server 2
10.1.1.2

Real Server 3
10.1.1.3

193.170.1.2

10.1.1.10

RSG

server-group

Server

Server

Server

Server

Backup Real Server

10.5.1.2

10.5.1.3