ACE howto: ¿Classic round-robin if cookie not present?

Question

Hello team:
My server farm behind the ACE will be used for applications that may or may not send cookies.
So I have been asked to configure the ACE to be aware of a certain cookie in order to stick client to server as expected. In paralell, I have also been asked to execute a classic round robin algorithm if no cookie is present on the HTTP sessions.
Then my question is: ¿ will my ACE, configured with the "sticky http-cookie ..." command, default to a classical round-robin algorithm if no cookie is detected in the HTTP request from the client?
Your hints will be greatly appreciated.
Best regards, Rogelio

Answer 1

Rogelio,
*/ Create a http parameter-map, if you did not do so already:
parameter-map type http HTTP
  case-insensitive
  persistence-rebalance
  set header-maxparse-length 65535
  set content-maxparse-length 65535
  length-exceed continue
*/ Match the cookie, and whatever value PHP created:
class-map type http loadbalance match-any PHPSESSID
  2 match http cookie PHPSESSID cookie-value ".*"
*/ Create a policy map, add the PHPSESSID class-map, and assign the sticky serverfarm.
*/ Assign your real servers to the default class (class-default)
policy-map type loadbalance http first-match STICKY_SLB_LOGIC
class PHPSESSID
  sticky-serverfarm STICKY_SERVERS
class class-default
  serverfarm REAL_SERVERS
*/ Add it to the service policy
policy-map multi-match CLIENT_VIPS
  class VIP-30
    loadbalance vip inservice
    loadbalance policy STICKY_SLB_LOGIC
    loadbalance vip icmp-reply active
    appl-parameter http advanced-options HTTP
Cheers mate,
Søren Elleby Sørensen