RE: WCCP and WAEs

Carlos,

Long story.
Very briefly you can design a WAN optimization solution in 4 different ways:

1- Inline
2- ACE module in a 6500 / ACE box
3- PBR
4- WCCP v.2

Is there any set of best practices; certainly there is. Have you ever heard of
a Cisco certified DC design? that's what the company and its advanced services
department are pushing very hard. Based on all those good things (if they are)
if you're going to go down the last path (which is recommended if you dont
have an ACE module or your design does need it) then the best practices say
what I told you.

Q1- What's going to happen if you don't like them or you just want not to
follow them?

Well, it depends. If you play with 61 and 62 and you have a small to medium
site probably the difference is not significant but if you fail to place them
at the right point and you have a massive DC with hundreds of sites hanging
off it then you will run into some performance (load balancing) issues. My
recommendation? lots of hands on WCCP experience plus a decent budget to
choose the best between ACE and WCCP.

Q2- Is there any fear of "routing loop" issues when running WCCP when you're
not following the best practices?

Yes there is. Especially if your design forces you to use the "out" direction
and not the "in" option (or wrong 61/62 placing) then you have to use the
"exclude" feature to make sure you're not sending and receiving packets as a
part of a loop.

Q3- One or more than one WAAS boxes?
Even if you have only one it's recommended to follow some design best
practices...see Q.2

I'll post more to our blog.
HTH,

--------------------------
Kambiz Agahian
CCIE (R&S)
CCSI, WAASSE, RSSSE
Technical Instructor
CCBOOTCAMP - Cisco Learning Solutions Partner (CLSP)
Email: kagahian_at_ccbootcamp.com
Toll Free: 877-654-2243
International: +1-702-968-5100
Skype: skype:ccbootcamp?call
FAX: +1-702-446-8012
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Training And Remote Racks: http://www.ccbootcamp.com

-----Original Message-----
From: Carlos G Mendioroz [mailto:tron_at_huapi.ba.ar]
Sent: Fri 4/9/2010 10:59 AM
To: Kambiz Agahian
Cc: Group Study; Cisco certification
Subject: Re: WCCP and WAEs

That sounds like you are making something quite simple look like
something more involved.

"The nature of this services" is just what they use as hash input.
One uses source IP,the other destination IP.

The hash output just decides which WAE is going to get the packet.
(hash maps get recalculated with WCCP registration, but this is just
getting into nitty gritty).

As I said, if you only have one WAE, all this is irrelevant (although
it can be confusing if someone who does not know what's going on, looks
at the configuration, and there's always the possiblity of someone
adding another WAE afterwards).

Oh well, being this a CCIE list, I like facts being discussed, concepts
being presented and sane discussions take place. I don't like recipes
that much :) If you are working on an article on this, why not sharing
the bits on a preview here ? :)

-Carlos

Kambiz Agahian @ 9/04/2010 14:44 -0300 dixit:
> It's due to the nature of these two services and the way they handle
> load distribution.
>
> We're working on an article to explain how to design an optimized WAN
> based on best practices. I'll post it to CCBOOTCAMP forum or blog in
> very near future.
>
>
> --------------------------
> Kambiz Agahian
> CCIE (R&S)
> CCSI, WAASSE, RSSSE
> Technical Instructor
> CCBOOTCAMP - Cisco Learning Solutions Partner (CLSP)
> Email: kagahian_at_ccbootcamp.com
> Toll Free: 877-654-2243
> International: +1-702-968-5100
> Skype: skype:ccbootcamp?call
> FAX: +1-702-446-8012
> YES! We take Cisco Learning Credits!
> Training And Remote Racks: http://www.ccbootcamp.com
>
>
>
>
>
> -----Original Message-----
> From: Carlos G Mendioroz [mailto:tron_at_huapi.ba.ar]
> Sent: Fri 4/9/2010 9:02 AM
> To: Kambiz Agahian
> Cc: Group Study; Cisco certification
> Subject: Re: WCCP and WAEs
>
> Would you please share why is that ? Or is it sort of black magic ? :)
>
> I would agree that if you have very few IP addresses on either side,
> and you have more than one WAE to choose from, then I would base the
> hash on the side that actually has many IPs, for the sake of having a
> smooth distribution.
>
> Is there any other thing that has to be accounted at design time ?
>
> -Carlos
>
> P.S.
> Original question was if the assignment was related (branch/central).
> Technically it is not, from the above design point of view, it is,
> and the original setting makes sense, because if you have more clients
> than servers, it makes sense to hash on clients, which are LAN side
> at the branch and WAN side at central.
>
>
> Kambiz Agahian @ 9/04/2010 12:19 -0300 dixit:
>> Hi there,
>>
>> This is a design issue. Based on the best practices in small to medium
> size
>> sites 61 goes on the internal interface and 62 is configured on the
> external
>> interface; however IF you have a data center with many servers behind
>> (logically not physically) the WAAS then 62 inside and 61 outside.
>>
>> Does it make sense?
>>
>> HTH,
>>
>>
>> --------------------------
>> Kambiz Agahian
>> CCIE (R&S)
>> CCSI, WAASSE, RSSSE
>> Technical Instructor
>> CCBOOTCAMP - Cisco Learning Solutions Partner (CLSP)
>> Email: kagahian_at_ccbootcamp.com
>> Toll Free: 877-654-2243
>> International: +1-702-968-5100
>> Skype: skype:ccbootcamp?call
>> FAX: +1-702-446-8012
>> YES! We take Cisco Learning Credits!
>> Training And Remote Racks: http://www.ccbootcamp.com
>>
>>
>> -----Original Message-----
>> From: nobody_at_groupstudy.com on behalf of Group Study
>> Sent: Fri 4/9/2010 5:52 AM
>> To: Cisco certification
>> Subject: OT: WCCP and WAEs
>>
>> question about Service 61 and 62.
>>
>> On the remote site, I have 61 on the LAN interface and 62 on the WAN
>> interface. Does it matter that I have 61 on the WAN interface on the
>> Data Center Router and 62 on the LAN? Effectively the opposite of the
>> remote site?
>>
>> I would think it does since 61 is based on Source and 62 on Destination...
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
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>>
>>
>>
>>
>
> --
> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>

--
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net