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Forum Discussion

Keith_Richards_'s avatar
Keith_Richards_
Icon for Nimbostratus rankNimbostratus
Jul 05, 2007

LB_FAILED event

Please can someone tell me how long the LTM will wait, given that the selected server hasn't responded, before triggering the LB_FAILED event. I have noticed that when people are using LB_FAILED for...
application delivery
dev
devops
iRules
hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
May 17, 2011
Hi Andrew,

 

 

You can check the LB_FAILED wiki page for details:

 

 

http://devcentral.f5.com/wiki/default.aspx/iRules/lb_failed

 

LB_FAILED is triggered when LTM is ready to send the request to a pool member and one hasn’t been chosen (the system failed to select a pool or a pool member), is unreachable (when no route to the target exists), or is non-responsive (fails to respond to a connection request).

 

 

How often do you see LB_FAILED triggered? If it's fairly consistent you could try running a tcpdump to capture the communication. I'd try capturing the client and serverside connection info in the trace so you can see exactly what's happening.

 

 

Aaron