From: miken (miken@mail.sisna.com)
Date: Sun Oct 24 2004 - 01:33:40 GMT-3
Hello
This information won't help anyone with the lab, but when you configure the cache engine for additional services such as SSL, RTP, etc, it will log a message as to the web-cache redirect number to configure on the wccp router.
Thanks
MikeN
---------- Original Message ----------------------------------
From: "ccie2be" <ccie2be@nyc.rr.com>
Reply-To: "ccie2be" <ccie2be@nyc.rr.com>
Date: Fri, 22 Oct 2004 11:13:59 -0400
>Sam,
>
>Here's what you need to understand about wccp.
>
>wccp is a protocol that redirects REQUESTS to the cache engine(s). Usually,
>the requests are HTTP requests but don't have to be.
>
>Now, consider how these REQUESTS flow through the router without wccp. A
>REQUEST from a web browser comes in one interface and the router will route
>that same REQUEST out another interface.
>
>So, there are 2 points at which the router can redirect the REQUEST - as it
>comes into the router or as it's about to go out of the router.
>
>So, the thing to remember is that with WCCP, it's always the REQUEST that's
>being redirected.
>
>The interface which connects to the cache engine is NOT relevant to how the
>command, ip wccp web-cache redirect, is used.
>
>If you want to redirect REQUESTS as they come into the router, you use the
>command with the IN option. If you want to redirect REQUESTS as they about
>to leave the router, you use the OUT option.
>
>Once the decision is made that you want to redirect HTTP (Web-cache)
>REQUESTS, the next thing is to decide at what interface to implement the
>redirection since it can be either on the input or the output interface and
>which is better.
>
>If, for example, you have web browsers off of 2 dozen ethernet interfaces
>and one serial interface going to the internet, you cold configure the
>command, ip wccp web-cache redirect in, on all 2 dozen ethernet interface by
>entering the command 24 times or you could enter the command, ip wccp
>web-cache redirect out just once on the serial interface. Both accomplish
>the same thing - http REQUESTS will be redirected to the cache engine. But,
>from a ease of configuration point of view, it's much easier to issue the
>command just once on the serial interface.
>
>However, from a router performance point of view, it's better to issue the
>command on all 24 input interfaces.
>
>Currently, IOS supports wccp version 2. Version 2 adds a number of new
>capabilties to the original version 1 of wccp, but the redirect concept
>remains the same. I think one of the new features of ver 2 is that now
>besides redirecting http requests, other types of requests for other types
>of sevices can be redirected as well to a cache engine or group of cache
>engines, for example, ftp. I don't know or understand that much about how
>to configure redirection for other services besides HTTP but I know that if
>you're redirecting something else instead of using the keyword web-cache you
>use a service number and the number 99 is reserved for reverse proxy
>whatever exactly that is - I don't really know.
>
>If you do a seach on cisco.com you'll find a few presentations on wccp which
>go into more detail on these and other features.
>
>HTH, Tim
>
>
>----- Original Message -----
>From: <samccie2004@yahoo.co.uk>
>To: "'De Witt, Duane'" <duane.dewitt@siemens.com>
>Cc: "'studygroup'" <ccielab@groupstudy.com>
>Sent: Friday, October 22, 2004 10:22 AM
>Subject: RE: WCCP direction ?
>
>
>> In other words, in on the interface facing cache server ?
>>
>> Thanks
>>
>> Sam
>>
>> -----Original Message-----
>> From: De Witt, Duane [mailto:duane.dewitt@siemens.com]
>> Sent: 22 October 2004 16:06
>> To: Scott Morris; samccie2004@yahoo.co.uk; studygroup
>> Subject: RE: WCCP direction ?
>>
>> Hi
>>
>> With WCCP redirection you ONLY use redirect in OR redirect out on an
>> interface. If you use both you will redirect return packets.
>>
>> The usual config is redirect in on your closest interface to the source
>> traffic so that CEF can reduce the load on the router.
>>
>> Regards
>> Duane
>>
>> -----Original Message-----
>> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>> Scott Morris
>> Sent: Friday, October 22, 2004 3:40 PM
>> To: samccie2004@yahoo.co.uk; 'studygroup'
>> Subject: RE: WCCP direction ?
>>
>> You should have one or the other from a technical perspective.
>>
>> If you put both, then things may be confusing where the router redirects
>> the
>> previously redirected requests. (Not sure on this, as I haven't tested
>> it,
>> but it sounds like a bad idea!)
>>
>> Scott
>>
>> -----Original Message-----
>> From: samccie2004@yahoo.co.uk [mailto:samccie2004@yahoo.co.uk]
>> Sent: Friday, October 22, 2004 8:05 AM
>> To: swm@emanon.com; 'studygroup'
>> Subject: RE: WCCP direction ?
>>
>> Scott
>>
>> Thanks for the clear explanation :-)
>>
>> For D-Day, would Cisco accept one or the other or both. Or perhaps it is
>> something that I need to deduct from the wording
>>
>> Regards
>>
>> Sam
>>
>> -----Original Message-----
>> From: Scott Morris [mailto:swm@emanon.com]
>> Sent: 21 October 2004 22:04
>> To: samccie2004@yahoo.co.uk; 'studygroup'
>> Subject: RE: WCCP direction ?
>>
>> The "redirect" is from the perspective of the router with regards to the
>> http request being made.
>>
>> So:
>>
>> User --> e0/0 (router) s0/0 --> internet web server
>>
>> The web request is seen INCOMING on e0/0 and OUTGOING on s0/0. You may
>> put
>> either:
>>
>> E0/0: ip wccp web-cache redirect in
>> S0/0: ip wccp web-cache redirect out
>>
>> The location of the web-cache itself is not part of the picture for this
>> particular command.
>>
>> HTH,
>>
>>
>> Scott Morris, MCSE, CCDP, CCIE4 (R&S/ISP-Dial/Security/Service Provider)
>> #4713, JNCIP, CCNA-WAN Switching, CCSP, Cable Communications Specialist,
>> IP
>> Telephony Support Specialist, IP Telephony Design Specialist, CISSP CCSI
>> #21903 swm@emanon.com
>>
>>
>>
>>
>>
>>
>> -----Original Message-----
>> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>> samccie2004@yahoo.co.uk
>> Sent: Thursday, October 21, 2004 1:11 PM
>> To: 'studygroup'
>> Subject: WCCP direction ?
>>
>> Hi Group
>>
>> I still find it confusing to decide the direction of re-redirection when
>> using caching engine.
>>
>> If a caching engine is on a LAN, would I redirect out to it so it caches
>> my
>> requests ?
>> Or redirect in, so I accept response from it.
>>
>> I am inclined to use 1st explanation.
>>
>> Any thoughts ?
>>
>> TIA
>>
>> Sam
>>
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