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Chapter 13 Layer 3 Redundancy
Avaya P333R-LB User’s Guide 125
Real Server Backup
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.
Note: 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.
Figure 13.5 Real Server Backup Configuration Example
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