Nortel Networks WEB OS 212777 - Manual (Page 135)

Web OS 10.0 Application Guide
Chapter 6: Server Load Balancing n 135
212777-A, February 2002
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:
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.
Real server groups can also use another real server group for backup/overflow:
>> # /cfg/slb/real 4 (Select real server 4 as backup)
>> Real server 4# rip 200.200.200.5 (Assign backup IP address)
>> Real server 4# ena (Enable real server 4)
>> Real server 4# /cfg/slb/real 1 (Select real server 1)
>> Real server 1# backup 4 (Real server 4 is backup for 1)
>> Real server 1# /cfg/slb/real 2 (Select real server 2)
>> Real server 2# backup 4 (Real server 4 is backup for 2)
>> # /cfg/slb/group <real server group number> (Select real server group)
>> Real server group# backup r4 (Assign real server 4 as backup)
>> # /cfg/slb/group <real server group number> (Select real server group)
>> Real server group# backup g2 (Assign real server group 2 as
backup)