Forum Discussion

Cirrostratus

Nov 12, 2019

Solved

LTM Traffic Policies vs iRules: Which runs first?

If you create an LTM traffic policy that has a rule operating at request time, and you create an iRule with a "when HTTP_REQUEST" event declaration, and you assign them both to the same virtual serve...

application delivery

iRules

LTM

JRahm
Nov 14, 2019
is correct, and the article link shows evidence and a test policy and iRule if you want to try it for yourself, but for clarity here, beginning with the introductions of policies in 11.4 the policy will always fire first and that cannot be modified.

JRahm

Admin

Nov 14, 2019

Yes, in context of when the traffic is being processed by TMM, the policy fires first and then the iRule. Here's the log entries from the article given similar policy and iRule on same virtual server:

 [/Common/http_event_order/policy_rule_logging]: Client Accepted Timestamp: 1532565045277
Rule /Common/http_event_order <CLIENT_ACCEPTED>: Timestamp: 1532565045278
[/Common/http_event_order/policy_rule_logging]: Request Timestamp: 1532565045279
Rule /Common/http_event_order <HTTP_REQUEST>: Timestamp: 1532565045279
Rule /Common/http_event_order <HTTP_REQUEST_RELEASE>: Timestamp: 1532565045282
 [/Common/http_event_order/policy_rule_logging]: Response Timestamp: 1532565045285
Rule /Common/http_event_order <HTTP_RESPONSE>: Timestamp: 1532565045285
Rule /Common/http_event_order <HTTP_RESPONSE_RELEASE>: Timestamp: 1532565045285