Cisco Catalyst 4500 Series Configuration Manual page 409

Chapter 2
A WCCP group address can be configured to set up a multicast address that cooperating devices and can
use to exchange WCCP protocol messages. If such an address is used, IP multicast routing must be
enabled so that the messages that use the configured group (multicast) addresses are received correctly.
This option instructs the device to use the specified multicast IP address to coalesce the "I See You"
responses for the "Here I Am" messages that it has received on this group address. The response is sent
to the group address as well. The default is for no group address to be configured, in which case all "Here
I Am" messages are responded to with a unicast reply.
ipv6 wccp
This option instructs the device to use an access list to control the traffic that is redirected to the service
group specified by the service name given. The access-list argument specifies either the number or the
name of a standard or extended access list. The access list itself specifies which traffic is permitted to be
redirected. The default is for no redirect list to be configured (all traffic is redirected).
WCCP requires that the following protocol and ports not be filtered by any access lists:
•
ipv6 wccp
This option instructs the router to use an access list to control the cache engines that are allowed to
participate in the specified service group. The access-list argument specifies either the number of a
standard or extended access list or the name of any type of named access list. The access list itself
specifies which cache engines are permitted to participate in the service group. The default is for no
group list to be configured, in which case all cache engines may participate in the service group.
Examples The following example shows how to configure the TCP promiscuous service for IPv4 VRF interfaces,
where VLAN 40 represents the server interface and VLAN 50 represents the content engine interface:
Switch# configure terminal
Switch(config)# ipv6 wccp vrf abc 91
Switch(config)# ipv6 wccp vrf abc 92
Switch(config)# interface vlan 30
Switch(config-if)# vrf forwarding abc s
Switch(config-if)# ipv6 wccp vrf abc 91 redirect in
Switch(config)# interface vlan 40
Switch(config-if)# vrf forwarding abc
Switch(config-if)# ipv6 wccp vrf abc 92 redirect in
Switch(config)# interface vlan 50
Switch(config-if)# vrf forwarding abc
Related Commands Command
show ipv6 wccp
vrf vrf name redirect-list access-list
User Datagram Protocol (UDP) (protocol type 17) port 2048. This port is used for control signaling.
Blocking this type of traffic will prevent WCCP from establishing a connection between the router
and cache engines.
vrf vrf name group-list access-list
Description
Displays global statistics related to WCCP.
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release XE 3.9.xE and 15.2(5)Ex
ipv6 wccp
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