Load Balancing with Source in STM-1's 7600

Unanswered Question
Sep 11th, 2008

Hi

Could someone tell me wath is the best method to do load balance in a couple of STM-1 links in a 7609 router?. we need to balance traffic as equal as possible. Can I balance with the source and destination host? Can I balance with source and destination UDP/TCP ports?.

Thank you, Best regards

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Giuseppe Larosa Thu, 09/11/2008 - 07:57

Hello Pedro,

with CEF base multilayer switching you can:

by default have a flow based load-balancing that uses

source ip EXOR dest ip EXOR hash

if you have a good number of concurrent flows >=100 and traffic volume on each flow is comparable you can get a good balancing

in the command reference shows a command for changing the load-balancing algorithm:

ip cef load-sharing algorithm

To select a Cisco Express Forwarding load-balancing algorithm, use the ip cef load-sharing algorithm command in global configuration mode. To return to the default universal load-balancing algorithm, use the no form of this command.

ip cef load-sharing algorithm {original | tunnel [id] | universal [id] | include-ports {source [id] | [destination] [id] | source [id] destination [id]}}

http://www.cisco.com/en/US/docs/ios/ipswitch/command/reference/isw_i1.html#wp1011833

the command is available in 12.2SX and from 12.2(33)SRA

Hope to help

Giuseppe

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