Configuring GRE WCCP on Cisco3845 router

[b.shoresh]

Hello.

We have some implementations of Blue Coat cache with layer2-WCCP configuration on our routers.  Now we have a new requirement to configure GRE-WCCP between a Cisco3845 router and a cache-engine, which sits several hops away from the router.  What's the difference in configuring the GRE-WCCP on the router ?  Can anyone direct me to a configuration guide which explains the GRE-WCCP configuration on the Cisco routers ? Does anyone have a configuration example to share ?

Thanks.

Boaz.

[ahskhan]

Hi,

WCCP Configuration on Cisco router require

1: enable WCCP on router globally, "ip wccp web-cache" or "ip wccp 10 "

depends what service is enable / configure on WCCP Client.

2: Apply WCCP redirect on interface where Router needs to intercept traffic

in accordance with Client requested protocol / ports and then send it to

WCCP Client (BlueCoat in this case)

All other WCCP related configuration is define on WCCP Client (BlueCoat in

this case), Redirect, return and assignment. Depending upon Cisco router /

switch supported redirect / assignment methods, Router and "WCCP Client"

will negotiate WCCP protocol.

See below CCO link for more details

http://www.cisco.com/en/US/docs/ios/ios_xe/ipapp/configuration/guide/ipapp_w

ccp_xe.html

Hope this helps.

Ahsan

[b.shoresh]

Thanks Ahsan.

So there is no difference between configuring layer2-WCCP and configuring GRE-WCCP on the router ?  I can use the same configuration that I've used for the layer2 WCCP installations ?

So how does the router know to create a GRE tunnel between itself and the cache engine ?  Does the cache-enginee request the GRE establishment and the router dynamically creates the GRE upon request from the cache enginee ? Will I see a GRE interface being created on the router once the cache engine and the router establish a session, or the encapsulation will take place transparently (with no new dynamic interface being created on teh router) ?

Boaz.

[ahskhan]

Hi,

For GRE redirection OR L2 redirection, both request came from the

client. When Client asked for GRE redirection and router supports it, a GRE

header will be added on a packet for redirection.

In IOS 15.x code you will see dynamic tunnel interfaces created as a result

of WCCP with GRE redirection. In older code this interface is not visible.

You mention that You need to move BlueCoat to GRE base redirection, Is this

normal WCCP GRE redirection or is there a new feature available on BlueCoat

which no one has implemented yet?

Ahsan

[b.shoresh]

Hi.

The Blue Coat devices are already working in my network.  They are using L2 WCCP.

We got new cache engines devices (not Blue Coat), for which I need to configure GRE WCCP.

Thank you very much for your replies.

Boaz.