Replace Isa Server with F5 Ltm

hello,

here is an example of a working irule

 From: W3C Extended Log File Examples (IIS 6.0)
 http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/ffdd7079-47be-4277-921f-7a3a6e610dcb.mspx?mfr=true
Fields: date time c-ip cs-username s-ip cs-method cs-uri-stem cs-uri-query sc-status sc-bytes cs-bytes time-taken cs-version cs(User-Agent) cs(Cookie) cs(Referrer)
 This iRule will open up to connections to two syslog pools. The desire is to put one syslog server in each pool, so you can send the same syslog data to two pools. 
when CLIENT_ACCEPTED {

     Open a new high speed logging connection to the syslog pool named syslog_server_pool
    set hsl1 [HSL::open -proto UDP -pool syslog_server_pool]
    set hsl2 [HSL::open -proto UDP -pool syslog_server_pool2]

}
when HTTP_REQUEST priority 999 {
     Save request variables that are not accessible in HTTP_RESPONSE, like the URI, request method, etc
    set req_start [clock clicks -milliseconds]
    set cs_username [HTTP::username]
    set cs_uri_stem [HTTP::path]
    set cs_uri_query [HTTP::query]
    set cs_bytes [HTTP::header Content-Length]
    set ua [HTTP::header User-Agent]
    set cookies [HTTP::header values Cookie]
    set referer [HTTP::header Referer]
}
when HTTP_RESPONSE {

     Send the syslog message with a syslog facility of 134 (local0.info)
     See the HSL wiki page for details on the facilties:
     https://devcentral.f5.com/wiki/iRules.HSL__send.ashx
    
     Replace null values with a hyphen:
       Use string map to replace a "tab space tab" with "tab hyphen tab"
    HSL::send $hsl1 "[string map [list "\t \t" "\t-\t"]\
        "<134>\t\
        [info hostname]\t\
        [IP::local_addr]\t\
        [clock format [clock seconds] -format "%d/%m/%Y %H:%M:%S %z"]\t\
        [IP::client_addr]\t\
        $cs_username\t\
        [clientside {IP::local_addr}]\t\
        $cs_uri_stem\t\
        $cs_uri_query\t\
        [HTTP::status]\t\
        [HTTP::header Content-Length]\t\
        [expr {[clock clicks -milliseconds] - $req_start}]\t\
        [HTTP::version]\t\
        \"$ua\"\t\
        $cookies\t\
        $referer\
        "]\n"
    HSL::send $hsl2 "[string map [list "\t \t" "\t-\t"]\
        "<134>\t\
        [info hostname]\t\
        [IP::local_addr]\t\
        [clock format [clock seconds] -format "%d/%m/%Y %H:%M:%S %z"]\t\
        [IP::client_addr]\t\
        $cs_username\t\
        [clientside {IP::local_addr}]\t\
        $cs_uri_stem\t\
        $cs_uri_query\t\
        [HTTP::status]\t\
        [HTTP::header Content-Length]\t\
        [expr {[clock clicks -milliseconds] - $req_start}]\t\
        [HTTP::version]\t\
        \"$ua\"\t\
        $cookies\t\
        $referer\
        "]\n"

}