Nortel Web OS Switch Software Application Manual page 135

Backup/Overflow Servers
A real server can backup other real servers and can handle overflow traffic when the maximum
connection limit is reached. Each backup real server must be assigned a real server number and
real server IP address. It must then be enabled. Finally, the backup server must be assigned to
each real server that it will back up. The following defines real server 4 as a backup for real
servers 1 and 2:
>> # /cfg/slb/real 4
>> Real server 4# rip 200.200.200.5
>> Real server 4# ena
>> Real server 4# /cfg/slb/real 1
>> Real server 1# backup 4
>> Real server 1# /cfg/slb/real 2
>> Real server 2# backup 4
In a similar fashion, a backup/overflow server can be assigned to a real server group. If all real
servers in a real server group fail or overflow, the backup comes online.
>> # /cfg/slb/group <real server group number>
>> Real server group# backup r4
Real server groups can also use another real server group for backup/overflow:
>> # /cfg/slb/group <real server group number>
>> Real server group# backup g2
212777-A, February 2002
Web OS 10.0 Application Guide
(Select real server 4 as backup)
(Assign backup IP address)
(Enable real server 4)
(Select real server 1)
(Real server 4 is backup for 1)
(Select real server 2)
(Real server 4 is backup for 2)
(Select real server group)
(Assign real server 4 as backup)
(Select real server group)
(Assign real server group 2 as
backup)
Chapter 6: Server Load Balancing
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