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My question is, what prevents a cache from seding a WCCP frame saying, "Hey, I'm alive" when it really isn't?
the application itself (layer 7) is most likely to know more about whether the application is alive and working than anything else.
(see below)
i believe WCCP is more a heartbeat mechanism - the router will age WCCP 'hello' packets and expire them. presumably if it doesn't hear one of the cache engines 'check in', it'll stop forwarding traffic to it.
Actually, that is inaccurate. For a cache to say that it is alive is insufficient. This is a reflection of a much more sophisticated, yet lightweight, state being maintained in the infrastructure. Although, this does reflect the view of L4 switch vendors and their "accomplices" -- it is in their best interest to make WCCP look like modified policy routing or simple state maintenance a la heartbeat. Seems like their FUD works. :( James, can you comment? I don't want to get into NDA h*ll ;) Cheers, Chris - -- Christian Kuhtz <ck@adsu.bellsouth.com> -wk ck@gnu.org -hm Sr. Network Architect, BellSouth Corp., Advanced Data Services NOTE: "We speak PGP: key available at well-known key servers." "Turnaucka's Law: The attention span of a computer is only as long as its electrical cord." -- /usr/games/fortune -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.0 for non-commercial use <http://www.pgp.com> iQA/AwUBNkhZ34RXnO1Cm58sEQJG9ACgkKKQly+oGJYoZHtM2I5f3JkCCGgAoO1X knqTNLpAHQ1M8TJqBvsGKQ8z =6epK -----END PGP SIGNATURE-----