Troubleshooting guide

1-31
Cisco Wide Area Application Services Configuration Guide
OL-26579-01
Chapter 1 Configuring Traffic Interception
Configuring WCCP on WAEs
Note For devices with WAAS versions earlier than 5.0, WCCP Version 2 is capable of negotiating the redirect
method and the return method for intercepted connections. The WAAS software supports WCCP GRE and
WCCP Layer 2 as WCCP-negotiated return methods. If WCCP negotiates a WCCP Layer 2 return, the
WAE defaults to using IP forwarding as the egress method. The WAE also defaults to IP forwarding if
the interception method is set to WCCP Layer 2 and you configure generic GRE as the egress method,
which are not compatible. When the WAE defaults to IP forwarding, the WAE logs a minor alarm that
is cleared when you correct the configuration so that the interception and egress methods are consistent.
The output of the show egress methods EXEC command also displays a warning if the interception and
egress methods are not consistent.
For devices with WAAS version 5.0, you must explicitly configure the egress method.
Configuring the Egress Method
To configure the egress method for WCCP-intercepted connections from the Central Manager, see the
“Configuring or Viewing the WCCP Settings on WAEs” section on page 1-17.
To configure the egress method for WCCP GRE packet return from the CLI, use the egress-method
WCCP configuration command:
WAE(config)# wccp tcp-promiscuous service-pair 61 62
WAE(config-wccp-service)# egress-method wccp-gre
To configure the egress method for L2 return from the CLI, use the egress-method WCCP configuration
command:
WAE(config)# wccp tcp-promiscuous service-pair 61 62
WAE(config-wccp-service)# egress-method L2
To configure the generic GRE egress method from the CLI, configure an intercepting router list and
configure the egress method, as follows:
WAE(config)# wccp router-list 1 192.168.68.98
WAE(config)# wccp tcp-promiscuous service-pair 61 62
WAE(config-wccp-service)# router-list-num 1
WAE(config-wccp-service)# egress-method generic-gre
The router list must contain the IP address of each intercepting router. Multicast addresses are not
supported. Additionally, you must configure a GRE tunnel interface on each router. For details on
configuring GRE tunnel interfaces on the routers, see the “Configuring a GRE Tunnel Interface on a
Router” section on page 1-31.
To view the egress method that is configured and that is being used on a particular WAE, use the
show wccp egress EXEC command. To view information about the egress method for each connection
segment, use the show statistics connection egress-methods EXEC command.
To view the generic GRE tunnel statistics for each intercepting router, use the show statistics
generic-gre EXEC command. To clear statistics information for the generic GRE egress method, use the
clear statistics generic-gre EXEC command.
Configuring a GRE Tunnel Interface on a Router
If you plan to use the generic GRE egress method on the WAE, you must configure a GRE tunnel
interface on each intercepting router. For ease of configuration, we recommend that you create a single
multipoint tunnel on the router, instead of one point-to-point tunnel per WAE in the farm.