At 04:37 PM 7/3/2003 +0000, Jans van Deventer wrote: >Does the CEF cache and Fast Switching cache reside in router memory?
Yes. > And >if so what makes CEF faster >than Fast Switching? The cache structure is more efficient. Thanks, Zsombor >Regards, >Jans > > >Fast switching builds a forwarding cache on the fly, based on the packets > >that reach the router and need to be switched. CEF builds the "cache" (CEF > >table) based on the routing table, independently from the traffic. > > > >The fast switching cache does not (necessarily) contain all the information > >that's in the routing table; it starts out empty and entries are aged out > >of it later on. Consequently the first packet of every new "session" going > >through the router must be process switched, ie. a routing table lookup and > >cache population need to take place before the packet can be forwarded. > > > >The CEF table always contains all the information that the router has > >access to, it changes (almost) immediately after the router receives a > >routing update. > > > >Thanks, > > > >Zsombor > > > >At 03:17 AM 7/3/2003 +0000, wj chou wrote: > > > > > >>Can anyone tell me what's the difference between fast switching and cef > >>switching? > >> > >>thanks first! > >> > >>Ellie >-- >================================ >Jans van Deventer >Phone: (55-61) 361-1466 >Fax: (55-61) 234-8722 >www.rhox.com.br >================================ Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=71847&t=71815 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
