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5-4
Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
OL-20002-02
Chapter 5 Configuring WCCPv2
Information About WCCPv2
Step 3 The routers reply with their view (list) of cache engines in the group.
The cache engines and routers exchange control messages every 10 seconds by default.
WCCPv2 Designated Cache Engine
WCCPv2 designates one cache engine as the lead. If there is a group of cache engines, the one seen by
all routers and the one that has the lowest IP address becomes the designated cache engine. The
designated cache engine determines how traffic should be allocated across cache engines. The traffic
assignment method is passed to the entire service group from the designated cache engine so that the
routers of the group can redirect the packets and the cache engines of the group can manage their traffic
load better.
Cisco NX-OS uses the mask method to assign traffic. The designated cache engine assigns the mask and
value sets to the router in the WCCP Redirect Assignment message. The router matches these mask and
value sets to the source IP address, destination IP address, source port, and destination port of each
packet. The router redirects the packet to the cache engine if the packet matches an assigned mask and
value set. If the packet does not match an assigned mask and value set, the router forwards the packet
without any redirection.
Redirection
You can use an IP access list as a redirect list to specify a subset of traffic to redirect with WCCPv2. You
can apply this access list for ingress or egress traffic on an interface. Figure 5-2 shows how redirection
applies to ingress or egress traffic.
Figure 5-2 WCCP Redirection
You can also exclude ingress traffic on an interface but allow egress redirection on that interface.
Ingress
Interface
Egress
Interface
Nexus
7000
L2/GRE L2/GRE
WCCP-Enabled
Appliance
WCCP
Redirect-In
Ingress
Interface
Egress
Interface
Nexus
7000
L2/GRE L2/GRE
WCCP-Enabled
Appliance
WCCP
Redirect-Out
WCCP
Exclude-in
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