BIG-LTM Loadbalancing problem

Also i have hunted the following irul as it seemed to be of help.

 

 

can u suggest.

 

 

when HTTP_RESPONSE {

 

 

Clear the BSI_SESSIONID if it exists already on this TCP connection

 

if {[info exists BSI_SESSIONID]}{

 

unset BSI_SESSIONID

 

}

 

 

Only look for the BSI_SESSIONID in text responses

 

if {[HTTP::header value "Content-Type"] starts_with "text"}{

 

 

log local0. "[IP::client_addr]:[TCP::client_port]: Matched text, enabling stream filter"

 

 

Because TCL doesn't support lookaheads, match the BSI_SESSIONID string and value

 

We'll parse out the value in STREAM_MATCHED

 

Assume the BSI_SESSIONID is 1 to 100 characters (terminated by a non-alphanumeric character).

 

STREAM::expression {@;BSI_SESSIONID=[A-Za-z0-9]{1,100}@}

 

STREAM::enable

 

 

Enable the STREAM_MATCHED event as it could have been disabled if there was a prior

 

response on this TCP connection

 

event STREAM_MATCHED enable

 

 

} else {

 

 

Disable the stream filter as this wasn't a text response

 

log local0. "[IP::client_addr]:[TCP::client_port]: No Content-Type match, disabling stream filter"

 

STREAM::disable

 

}

 

}

 

when STREAM_MATCHED {

 

 

Save the matched value (example: ;BSI_SESSIONID=ABCDEF)

 

set BSI_SESSIONID [STREAM::match]

 

log local0. "[IP::client_addr]:[TCP::client_port]: Matched: $BSI_SESSIONID"

 

 

STREAM::match shouldn't match a null string with the defined regex, but check anyhow

 

if {[string length $BSI_SESSIONID]}{

 

 

Get the BSI_SESSIONID value (split ;BSI_SESSIONID=ABCDEF on the equals sign)

 

set BSI_SESSIONID [getfield $BSI_SESSIONID "=" 2]

 

 

The iRule parser doesn't allow the persist command in STREAM_MATCHED.

 

It works though, so hide the command from the parser

 

set persist_cmd "persist add uie $BSI_SESSIONID"

 

log local0. "[IP::client_addr]:[TCP::client_port]: Parsed: $BSI_SESSIONID \$persist_cmd: $persist_cmd"

 

 

eval $persist_cmd

 

persist add uie $BSI_SESSIONID

 

 

Assume the first match is the same as any other BSI_SESSIONIDs, so stop checking for them

 

log local0. "[IP::client_addr]:[TCP::client_port]: Added persistence record. Exiting event for this response."

 

event STREAM_MATCHED disable

 

}

 

}