ACE configuration check-up!

Unanswered Question
Apr 22nd, 2010
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Hi everyone.


I would like to check the following ace configuration,

My main question is that the ace config like below is same function?


case.1

serverfarm host NAME_of_SERVERFARM

  rserver REAL01

    probe TCP50000

    inservice

  rserver REAL02

    probe TCP50000

    inservice



case.2



serverfarm host NAME_of_SERVERFARM

  probe TCP50000

  rserver REAL01

    inservice

  rserver REAL02

    inservice



we forcus on probe,

in case,1 the probe is assigned on each real server, but in case2, the probe is only server farm, not on each rserver.

in this case. case1, case2 is same function? or not. Is there something special in two case?


finally!

in case.3

serverfarm host NAME_of_SERVERFARM

  probe icmp

  rserver REAL01

  probe TCP50000

    inservice

  rserver REAL02


  probe TCP50000

    inservice


this case is in probe, on each rserver and server farm, on server farm check on icmp and rserver check the service port.

in that case, if just one probe is dead, the server farm declare the rserver is dead ,regardless of tcp is up.


Thank you.

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ciscocsoc Thu, 04/22/2010 - 06:56
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Hi,


Case 1 and Case 2 are equivalent. A probe applied to a serverfarm is applied to all rservers within it.


Logically


serverfarm host  NAME_of_SERVERFARM

  probe icmp

  rserver REAL01

   probe TCP50000

    inservice

  rserver REAL02


is equivalent to:


serverfarm host  NAME_of_SERVERFARM

  probe icmp

  rserver REAL01

   probe TCP50000

  probe icmp

    inservice

  rserver REAL02

   probe TCP50000

  probe icmp

    inservice


so if either probe on an rserver fails it will make that rserver out of rotation.


This could be written as


serverfarm host  NAME_of_SERVERFARM

  probe icmp

    probe TCP50000

  rserver REAL01

    inservice

  rserver REAL02

    inservice


If you want to have an rserver taken out of rotation only if all the probes on it fail then you need to add the "fail-on-all" command.


HTH


Cathy

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