I want to run wccp gre between bluecoat proxsg and 6509 but i don't understand if it is possible with GRE (best practices "Cisco catalyst 6500 wccp gre return is handled in software", Bluecoat doc :"Typically, GRE forwarding is supported on software-based switching
platforms such as the Cisco 800, 1800, 2800, 3800, 7200, and 7500").
currently it's not run with windows seven client and ie7 and http in vlan 62 (wccp 1 redirect in).
Packets are bypassed (Total Bypassed Packets Received: 281) but there are exchanges between proxysg and 6509. where is the problem ? GRE ?
I see that the Bypass counter is incrementing in the given output.
WCCP Bypass Packets
Web Cache Communication Protocol (WCCP) intercepts IP packets and redirects those packets to a destination other than the destination that is specified in the IP header. Typically the packets are redirected from a web server on the Internet to a web cache that is local to the destination.
Occasionally a web cache decides that it cannot deal with the redirected packets appropriately and returns the packets unchanged to the originating router. These packets are called "bypass packets" and are returned to the originating router encapsulated in generic routing encapsulation (GRE). The router decapsulates and forwards the packets normally.
Problems have been encountered because CPU usage is very high when WCCP is enabled. The counters enable a determination of the bypass traffic directly on the router and can indicate whether or not this is the cause. In some situations, 10 percent bypass traffic may be normal; in other situations, it may be high. However, any figure above 25 percent should prompt a closer investigation of what is occurring in the web cache.
If the counters suggest that the level of bypass traffic is high, the next step is to examine the bypass counters in the web cache and determine why the web cache is choosing to bypass the traffic. You can log in to the web-cache console and use the command line interface (CLI) to investigate further. The counters allow you to determine the percent of traffic being bypassed.
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