[c-nsp] WCCPv2 - what happens to existing connections when redirect-list is modified?

[Brad Hedlund]

Dale,

If the affected flows are NOT being optimized by WAAS (pass-through
connections), your result should be #2.

If the affected flows ARE being optimized by WAAS, your result should be #3.

Cheers,

Brad Hedlund
bhedlund at cisco.com
http://www.internetworkexpert.org


On 5/21/09 10:38 PM, "Dale Shaw" <dale.shaw+cisco-nsp at gmail.com> wrote:

> Hi all,
> 
> Scenario: WCCPv2 configured and active for WAAS, all TCP traffic
> redirected (no redirect-list configured for service groups 61 and 62)
> 
> What happens to active/existing TCP sessions that _are_ being
> intercepted/redirected if I configure a redirect-list with a 'deny'
> statement that matches the session?
> 
> I'm not intimately familiar with WCCPv2 operation but I assume these
> are the possibilities:
> 
> 1) existing connections are not affected and continue to be
> intercepted/redirected in spite of ACL; new connections are not
> intercepted/redirected; WCCP is smart!
> 2) new packets for existing connections stop being
> intercepted/redirected and are routed normally - TCP copes OK and
> sessions stay up; TCP is amazing!
> 3) as above, but TCP does not cope, as SEQs/ACKs etc. change; sessions
> are torn down/time out; TCP is only human
> 4) something else :-)
> 
> Can anyone provide any insight?
> 
> Adrian Chadd, I'm shining the bat torch towards the sky, are you out there?
> :-)
> 
> cheers,
> Dale
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