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johndegern_4568's avatar
johndegern_4568
Icon for Nimbostratus rankNimbostratus
Mar 29, 2010

How many redirects can I have in a single iRule?

I have a project where I would like to use BigIP to redirect 200+ domains to different domains. Sometimes to a host::uri.     How many "If Else" can one have in an iRule? Would a better ap...
application delivery
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iRules
hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
Mar 30, 2010
You could chain 200 if/elseif.../else together, but it would get a bit unwieldy. You could still use a datagroup in 9.3.1. But you'd use matchclass or findclass to search the class. ~200 lines shouldn't add a lot of overhead but it's always good to do performance testing if you can before using a rule like this in production. If the redirects are all of the same VIP, it would be best to combine the redirects in a single iRule. This helps you avoid attempting to send multiple redirects on the same request (which triggers a runtime TCL error).

 

 

For details you can check the various wiki pages:

 

 

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

 

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

 

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

 

 

Aaron