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Dave_21103's avatar
Dave_21103
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Jun 26, 2014
Solved

LTM - Load Balancing iRule

We have a VIP that takes two connections per day coming from the same client. The client opens the two connections within the same second of each other, each connection stays open for 30 seconds. P...
application delivery
devops
iRules
LTM
  • nitass_89166's avatar
    nitass_89166
    Jun 29, 2014

    The intermittent issue is that sometimes the two connections get load balanced to one member and sometimes each member receives one connection. Is there an iRule I can put in place to ensure one connection goes to each member every time?

     

    what you are seeing is due to how cmp works. i think disabling cmp should work.

     

    sol14358: Overview of Clustered Multiprocessing (11.3.0 and later)

     

    http://support.f5.com/kb/en-us/solutions/public/14000/300/sol14358.html

     

    if you do not want to disable cmp, irule similar to Matt's suggestion is needed (global variable will demote cmp, so you have to store global_myvsconncnt in session table instead).

     

    sol13033: Constructing CMP-compatible iRules

     

    http://support.f5.com/kb/en-us/solutions/public/13000/000/sol13033.html

     

Dave_21103's avatar
Dave_21103
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Jul 14, 2014

Thanks everybody who posted for help with this issue. We ended up disabling CMP on the VIP with the following command and that fixed our issue, connections are balanced exactly even between the two members in the pool: modify ltm virtual VIRTUALNAME cmp-enabled no. Since we only have up to 4 connection per day, disabling CMP didn't have any affect on the performance of the VIP.