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RE: WCCP talk..
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 > >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 <firstname.lastname@example.org> -wk email@example.com -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-----