Server Load Balancing

August 21, 2008 at 4:56 pm | Posted in IOS services | Leave a comment

Server load balancing basics:

  • IOS Server load balancing hides multiple physical machines behind a single virtual IP adress, extending NAT logic.
  • Weight can be assigned to individual servers in order to influence load-balancing ratio
  • Sticky connections allow all connections from one client to the same server for consistency
  • Other features such as synguard, caching, fail/unfail detection, etc.

Configuration example:

Interface                  IP-Address      OK? Method Status                Protocol
Ethernet0/0             YES NVRAM  up                    down
Serial1/0              YES NVRAM  up                    up
Serial1/1              YES NVRAM  up                    up
Loopback0               YES NVRAM  up                    up

ip slb serverfarm SERVERS
predictor leastconns
bindid 1
weight 16
maxconns 500
weight 32
maxconns 1000
ip slb vserver WEB
virtual tcp www
serverfarm SERVERS
idle 1800
synguard 1000

Doc CD navigation

  • Cisco IOS IP Application Services Configuration Guide, Release 12.4
  • Cisco IOS Server Load Balancing

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