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Forum Discussion

Miguel_61449's avatar
Miguel_61449
Icon for Nimbostratus rankNimbostratus
Sep 28, 2011

Internal big ip ltm flow consultation

Hello all,     I would like to inquire about the operation of iRules and the http_class in a big-ip ltm system. I have a pretty good idea of how these resources work and can be allocated to...
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hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
Sep 28, 2011
Hi Miguel,

 

 

An iRule can have multiple events which execute before and after the HTTP class(es) are evaluated. Here's a quick list:

 

 

CLIENT_ACCEPTED - TCP connection from client to VIP established

 

HTTP_REQUEST - client's HTTP request headers parsed

 

HTTP_CLASS_SELECTED (if a matching class is found for a request) or HTTP_CLASS_FAILED (if no matching class is found for a request). If a pool is added to the HTTP class and it matches the request, the pool selection will override the VS default pool and any pool selected in the HTTP_REQUEST event.

 

LB_SELECTED - pool member selected

 

SERVER_CONNECTED - TCP connection from LTM to server established

 

HTTP_REQUEST_SEND - just before the HTTP request is sent to the server

 

HTTP_REQUEST_RELEASE - last chance to inspect/modify HTTP headers only before request is sent to pool/node (added in v11.0)

 

HTTP_RESPONSE - server's HTTP response headers parsed

 

HTTP_REQUEST_RELEASE - last chance to inspect/modify HTTP headers only before request is sent to client (added in v11.0)

 

SERVER_CLOSED - LTM to server connection closed

 

CLIENT_CLOSED - client to VIP connection closed

 

 

Aaron