I cant what Cache's you're using ? The Mask/Hash needs to be set by the Cache. I've had it working successfully with BlueCoat SG8100 and a 6500 but haven't got as far as Throughput testing. There is plenty of discussion on 6500 + WCCP in the archive - the recommendation has always been that it should be L2 + Mask for full hardware assistance. There is a minor difference between inbound+outbound (I think its inbound is preffered) but to check I'd have to search the archive.
Somewhere on CCO there's a slide deck that explains it in more detail. On Monday I'll check my work PC for a link. Dean Smith -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Charles Glass Sent: 11 April 2008 15:22 To: [email protected] Subject: [c-nsp] WCCP performance problem on a 7600 Hi, I have a problem with performance on a 7600 with WCCP enabled. WCCP has been configured to use GRE forwarding and HASH assignment. I understand that GRE forwarding with HASH assignment is not the preferred configuration for WCCP on a 7600 and that GRE is not supported in hardware. Configuring L2 forwarding and HASH assignment yields no performance improvement from what I have seen. WCCP is applied inbound on two interfaces of an ES20 line card (with DFC-3CXL). The inbound traffic rate on each port is approximately 250Mbps at 10k pps. My understanding from the Cisco documentation (referenced below) is that forwarding should be assisted by the routing hardware when using L2 forwarding with HASH assignment. To make full use of hardware redirection the cache engines would need to be configured with L2 forwarding and mask assignment. CPU utilisation on the ES20 linecard and RP of the 7600 using GRE forwarding and HASH assignment: #sh platform hardware capacity cpu CPU Resources CPU utilization: Module 5 seconds 1 minute 5 minutes 1 31% / 12% 42% 41% 5 RP 83% / 72% 80% 81% 5 SP 10% / 0% 6% 6% By comparison a 7200 NPE-G1 will forward ~300Mbps with WCCP configured inbound at ~60% CPU (GRE forwarding with HASH assignment) Has anyone seen simlar performance when using WCCP with GRE forwarding and HASH assigment? Has anyone else seen the same performance with L2 forwarding and HASH assignment as with GRE forwarding and HASH assignment? Has anyone seen better performance using L2 forwarding with HASH assignment than what I have described? Is anyone using L2 forwarding with MASK assignment? Could anyone relate their experiences using WCCP on the 65k/7600 using different forwarding and assignment methods? Ideally I would like to use L2 forwarding with MASK assignment. GRE is not the preferred configuration. Below are excerpts from a cisco document: "Catalyst 6500 series switches and Cisco 7600 series routers provide WCCP Layer 2 Policy Feature Card (PFC) redirection hardware acceleration." "Redirection processing is accelerated in the switching or routing hardware, which is more efficient than L3 redirection with Generic Routing Encapsulation (GRE)." "L2 redirection takes place on the switch or router, and is not visible to the Multilayer Switch Feature Card (MSFC)." "In order for the router or switch to make full use of hardware redirection, the content engine must be configured with L2 redirection and mask assignment" http://www.cisco.com/en/US/docs/ios/12_4t/ip_appl/configuration/guide/htwccp .html WCCP configuration: ip wccp web-cache redirect-list 199 group-list 100 password 7 *** ! interface GigabitEthernet1/0/5 ip wccp web-cache redirect in ip address 192.168.0.1 255.255.255.0 ip ospf authentication-key 7 *** mls qos trust dscp ! interface GigabitEthernet1/0/10 ip address 192.168.1.1 255.255.255.0 ip wccp web-cache redirect in ip ospf authentication-key 7 *** mls qos trust dscp ! Regards, Charles _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
