On Tue, Jul 17, 2007, Ming-Ching Tiew wrote: > I got the word "level 4 switch" from someone who knows nothing else, > so I have to make guesses too. But I would imagine that it is doing L2 > rewrite. > Care to elaborate how the L2 rewrite in Cisco TCAM works ? I'm not a Cisco engineer. :) They basically match on various parts of the IP/TCP header using TCAM rules and set the next-hop. > Does it constantly do arp request based on IP of the cache engine and update > the MAC address accordingly ( much like ip routing does ) or it statically > configure the the mac address of the cache engine ? I can't tell you without inspecting the CEF/TCAM tables on a Cisco device running WCCPv2. I'd -guess- there's an L3 rewrite which the WCCPv2 L2 requirement of "must be directly connected" translates essentially into an L2 rewrite. The end result -is- an L2 rewrite though, and stuff is negotiated using the router and cache IP addresses.. Just pick up a cheap Cisco 3550 off Ebay; they do WCCPv2 with L2 redirect good enough for experimenting. Adrian
