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Lou_125071's avatar
Lou_125071
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Aug 27, 2018

Cisco ACE Probe to F5 monitor

OK I'm a little late to the game moving over my Cisco ACE VIPs. I have a couple questions on the Cisco Monitor vs the F5 Probes. See below.

 

Cisco ACE Probe

 

probe http Test port 80 interval 30 faildetect 6 passdetect interval 90 request method get url /Healthcheck/api/healthcheck/ expect status 200 200

 

F5 Moniroe

 

ltm monitor Test { defaults from HTTP send string : GET /Healthcheck/api/healthcheck/HTTP/1.1 \r\n interval 30 timeout 91 retry 6 }

 

The only thing I'm concerned with in my question is the ACE faildetect interval the equivalent to the retry on the F5? And is the pass detect equivalant to the timeout?

 

application delivery
LTM

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  • Niels_van_Sluis's avatar
    Niels_van_Sluis
    Icon for MVP rankMVP
    Aug 27, 2018

    The retry option is used when configuring inband monitors, so this is nothing like the faildetect parameter from Cisco. The BIG-IP uses the interval and timeout parameters to achieve a faildetect. For example, the default interval is 5 seconds and a timeout of 16 seconds. This would be a faildetect of 3, since only 3 probes would fit into the timeout of 16 seconds.

     

    In your Cisco example the interval is set to 30 seconds. If you would apply a faildetect of 6, you would use a timeout of 181 seconds, because it will take 6 probes before the timeout of 181 seconds is reached.

     

    The pass detect parameter would be replaced by the ‘time until up’ parameter.

     

    This parameter delays the marking of a pool member or node as up for the specified number of seconds after receiving the first correct response. When this attribute is set to 0 (the default value), the BIG-IP system marks the resource as up immediately after receiving the first correct response.

     

    For more info on all monitor settings see:

     

    https://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/bigip-local-traffic-manager-monitors-reference-13-0-0.html