Try these links. Lots of the infromation is scattered around. Of course it's all IOS version and platform dependent http://www.cisco.com/univercd/cc/td/doc/product/software/ios111/cc111/bgppro p.htm http://www.cisco.com/warp/customer/cc/pd/rt/7200/nse1/prodlit/nse1_ds.htm http://www.cisco.com/warp/public/105/20.html Hope this helps, Tony M. #6172 ----- Original Message ----- From: NRF To: Sent: Sunday, May 20, 2001 4:56 AM Subject: Can fast switching/CEF handle QoS/ext. [7:5180] > I would like to know if anybody can tell me how or even if fast-switching > and CEF handle special packet handling decisions like extended access-lists, > policy-routing, QoS (like queuing, CAR, WRED). From reading the CiscoPress > book "Inside Cisco IOS Software Architecture", I understand how > fast-switching and CEF work in normal packet forwarding situations. But > what happens when more intelligence is needed in packet forwarding, like in > situations mentioned above? > > I am well aware of the command "ip route-cache policy", which seems to imply > that a policy route can be cached for fast-switching. I am interested in > finding out how this really works. Because I can make a policy route that > matches on so many different things (source IP, IP precedence/TOS value, > packet length,etc.) and can change so many different things (next hop, > default next hop, prec/TOS, etc.), it seems to me that the tree or trie or > whatever logic structure IOS may use would quickly become overwhelmed by the > sheer number of possibilities. Which makes me wonder whether the router can > really cache the policy at all, or if it can, should it (as opposed to just > process-switching the packet). > > Thanx > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=5182&t=5180 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
