On Wed, 30 Oct 2002, Rick Ernst wrote: > Has anybody seen issues with high CPU utilization on WCCP? > > My test environment is a Cisco 7513 running 12.1(12C)-E1 handling about 80Mbs of > aggregate traffic. The cache server is an Intel Netstructure 1500. > > With and without global WCCP enabled, CPU is about 5%. If I enable wccp > redirection on outbound interfaces (inbound isn't an option with this version of > IOS), CPU goes to almost 90% and stays there. > > I'm using an ACL to allow only a single machine for testing. > > Am I missing something obvious?
WCCP can be pretty expensive, CPU wise, especially if you're using IPGRE encapsulation. with IPGRE each redirected packet has to pass deep down into IOS where its headers are rewritten & repacketized for WCCP. To cut down on router CPU utilization, try using MAC level redirection if you're cache is directly connected to the router (or it may also work if you have a proxy arp path open between the cache and the router). Mac level redirection avoids rewriting each packet by forwarding them off at the MAC level. limitations: you're cache might not support MAC redirection. Also, the Cisco TAC doesn't seem to like MAC redirection much, so support can be questionable. Good luck, -- -Nate Smith <[EMAIL PROTECTED]> ____________ The ISP-CACHING Discussion List ___________ To Join: mailto:join-isp-caching@;isp-caching.com To Remove: mailto:remove-isp-caching@;isp-caching.com Archives: http://isp-lists.isp-planet.com/isp-caching/archives/
