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dan_19334's avatar
dan_19334
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Feb 06, 2008

Web Proxy Load Balancing

Hi,

 

 

Is it possible to have separate LTMs load balance clients in the same way?

 

 

This is for outbound load balancing to our web proxies. Right now we are doing simple persistence but if a user is directed to the other LTM then they may be load balanced to a different web proxy and this is breaking some types of connections; namely Citrix.

 

 

We have GTMs as well but if we do global availability then all of the traffic is sent through just one LTM, where we are trying to leverage both equally.

 

 

So, looking for a way to send clients to the same proxy no matter which LTM their traffic is sent through.

 

 

TIA,

 

-Dan
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  • The_Bhattman's avatar
    The_Bhattman
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    Feb 18, 2008
    Hi Dan,

     

    I believe there is a way to load balance them in the same manner. It's called Election HASH. However, it's only supported on v9.4.2+. The link to see an example is the following Click here. The major benefit is it removes the requirement for the LTM to keep a persistence table.

     

     

     

    Thanks,

     

    CB

     

     

     

  • dan_19334's avatar
    dan_19334
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    Feb 19, 2008
    Thanks CB for the info. This sounds like it has potential, I will test and give it try.
  • NathanM_65949's avatar
    NathanM_65949
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    Apr 16, 2008
    As long as all LTMs have the same list of pool members, they will always load balance and persist to the same server for a given piece of content. This is the big difference between generic hash and Election Hash. I know of a few deployments now that are using different LTMs to do this.

     

     

    - nathan