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Netscaler ADC GSLB MEP delay


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Hi,

 

We have a worldwide GSLB configuration. Sometimes it happens that MEP reports, that a remote GSLB site is DOWN and so it also takes the GSLB services of this site DOWN. After a few seconds it goes UP again.

How sensitive is MEP? How does the monitoring of the GSLB sites work and how long does it take until MEP reports a remote site as DOWN?

 

I found this setting in the GSLB parameters: "GSLB Service State Delay Time (sec)". 

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Based on the description this delay can be configured to wait until ADC takes the remote GSLB services down, after a GSLB site goes down.

Is this the correct setting to ignore short network outages?

 

br, Patrick

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  • 1 month later...

Yes, that is correct. This setting was introduced to prevent disruption of service when the remote service isn't actually down but MEP had a 'blip'.

https://support.citrix.com/article/CTX219900

 

Alternatively, you can bind a monitor to a remote service and then change the 'Trigger Monitor' value on the GSLB Site from 'Always' to 'MEPDOWN_SVCDOWN'.

https://docs.citrix.com/en-us/netscaler/12/global-server-load-balancing/monitoring.html

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