From: Marvin Greenlee (marvingreenlee@yahoo.com)
Date: Wed Apr 14 2004 - 12:30:46 GMT-3
This is explained graphically in the WCCP
implementation PDF link.
Three interfaces 0/1, 0/2, and 0/3
0/1 is the incoming interface
0/2 is the interface to the Cache engine
0/3 is the interface the traffic would normally go to.
When you configure inbound (on 0/1), the router makes
a determination on the outgoing interface (Send web
traffic to the cache engine - 0/2). When you
configure outbound, the router/switch has already made
a decision to send the traffic to 0/3 (the outbound
interface), and as it is being prepared to send out
interface 0/3, it realizes that the traffic needs to
be redirected to the cache engine, and the traffic is
switched a second time (out interface 0/2).
Marvin Greenlee
marvin@ccbootcamp.com
--- David Hurtado <dei2viccie@hotmail.com> wrote:
> Hello Marvin,
>
> Would you mind to explain why the traffic will be
> switched twice if you use
> "ip wccp redirect out"?
>
> The way i see WCCP, if i use "ip wccp redirect out",
> the router will
> redirect the request going out from the interface,
> which are completely
> different from the requests that go into the
> interface.
>
> Maybe you are trying to explain that is better to
> use "ip wccp redirect in"
> in the incoming interface than "ip wccp redirect
> out" in the outgoing
> interface, because in this way you don't have to
> make a IP route table
> check, find the ougoing interface and later redirect
> the request. Using "ip
> wccp redirect in" in the incoming interface you
> redirect and don't look for
> the ougoing interface.
>
> Is this what you wanted to explain?
>
>
> Please help me because me understanding of WCCP is
> very poor.
>
> Thanks a lot
>
>
> >From: Marvin Greenlee <marvingreenlee@yahoo.com>
> >Reply-To: Marvin Greenlee
> <marvingreenlee@yahoo.com>
> >To: Xy Hien Le <byme88@hotmail.com>
> >CC: ccielab@groupstudy.com
> >Subject: Re: Question about Tunnel interface and
> criteria of WCCP
> >Date: Wed, 14 Apr 2004 07:12:59 -0700 (PDT)
> >
> >1. If concerned about adding new addresses, ask
> the
> >proctor.
> >
> >2. With WCCP, In or Out specifies whether you are
> >doing ingress or egress filtering.
> >The command 'ip wccp redirect' tells the router
> what
> >traffic to redirect. It does not matter where the
> >cache server is. The cache server sets up a
> heartbeat
> >between itself and the router/switch, so that the
> >router/switch knows where the cache server is. If
> your
> >clients are on a certain interface, it is
> recommended
> >to use the 'ip wccp redirect in', so that traffic
> does
> >not have to be switched twice.
> >
> >See also:
> >WCCP Implementation PDF Presentation.
>
>http://www.cisco.com/warp/public/732/Tech/switching/wccp/docs/WCCP_Implementation.pdf
> >
> >
> >Sample config for WCCP with a 3550 and a CE
>
>http://www.cisco.com/en/US/products/hw/contnetw/ps761/products_configuration_example09186a0080160b28.shtml
> >
> >Cisco WCCP Presentations
>
>http://www.cisco.com/warp/public/732/Tech/switching/wccp/presentations.shtml
> >
> >
> >Marvin Greenlee, CCIE #12237
> >Network Learning, Inc.
> >Senior Technical Advisor
> >marvin@ccbootcamp.com
> >www.ccbootcamp.com
> >
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