TCL runtime error with persist lookup

Thanks to the help above and some more scurrying around, we got it working. Here's how it was done:

 

 

In the BIG-IP GUI, we specified a default pool and persistence profile (universal) under the resources tab of the virtual server running the iRule.

 

 

We then used the [session] command to store the pool outcome for a given IP/UA combination when we suspected the client was cookie-disabled.

 

 

Here's the code we used in the HTTP_REQUEST event:

 

 

create sessionID from IP and UA combianton (removing spaces)

 

set SessionID [string map {" " "_"} "[IP::remote_addr].[HTTP::header User-Agent]"]

 

 

check persistence table for previous requests

 

switch [session lookup uie $SessionID] {

 

"A" { set PoolVal "A" }

 

"B" { set PoolVal "B" }

 

default {

 

do other stuff to set Pool value

 

}

 

}

 

 

based on pool value, set the destination pool for request

 

switch $PoolVal {

 

"A" { pool poolA }

 

"B" { pool poolB }

 

default { pool poolA }

 

}

 

 

persist the session ID for repeat requests

 

session add uie $SessionID $PoolVal 1800