Re: Catalyst 3550 class-default

From: Petr Lapukhov (petr@internetworkexpert.com)
Date: Mon Nov 10 2008 - 17:53:32 ARST

Hi,
This thing surely is covered in VOL1 QoS section :) In short, the 3550 does
not have consistent behavior for the class-default. I personally never seen
it matching traffic correcly, but some people were assuring me it works in
some cases. Well, so far i would recommend using separate classes to match
L2/L3 traffic. If you need to limit the aggregate rate, just use the
aggregate policer. For the class-default in the 3560 you can match L2/L3
traffic, with some restrictions for per-VLAN policing (nested policy-map).
HTH 

-- 
Petr Lapukhov, CCIE #16379 (R&S/Security/SP/Voice)
petr@internetworkexpert.com

Internetwork Expert, Inc.
http://www.InternetworkExpert.com
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Outside US: 775-826-4344

2008/11/10 Reza Toghraee <reza@toghraee.com>

> Hi Howard,
>
> I used the Petr documents about 3550, 3560 QOS in IE blog, but requires to
> be read around 3 or more times. I didn't check the IE Vol1 Ver 5 QOS, maybe
> there are some good points there.
>
> Wish you the bests on your way.
>
> Reza
>
>
> -----Original Message-----
> From: Howard Hooper [mailto:Howard.Hooper@dupre.co.uk]
> Sent: Monday, November 10, 2008 3:49 PM
> To: Reza Toghraee; ccielab@groupstudy.com
> Subject: RE: Catalyst 3550 class-default
>
> Hi Reza,
>
> That's great thank you for your advice, I thought to be on the safe side
> I'll use classes for everything on the 3550 instead of using the
> class-default from now on.
>
> Also congratulations on passing recently that's excellent news!!
>
> Kind regards
>
> Howard
>
>
> -----Original Message-----
> From: Reza Toghraee [mailto:reza@toghraee.com]
> Sent: 10 November 2008 12:05
> To: Howard Hooper; ccielab@groupstudy.com
> Subject: RE: Catalyst 3550 class-default
>
> Howard,
>
> Exactly same experience like me.
> Only on 3560, you can use class-default. For 3550 you must create
> classes to
> match all other traffic.
>
> Reza
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Howard Hooper
> Sent: Monday, November 10, 2008 12:05 AM
> To: ccielab@groupstudy.com
> Subject: Re: Catalyst 3550 class-default
>
> Hi All,
>
> I was wondering if anybody could offer some advice on whether or not to
> use
> the class-default class on the 3550 if I come up against the need to in
> the
> lab?
> The reason I ask is because I've seen it written in a few places that
> using
> the 3550 class-default class to match the remaining layer 2 or 3 traffic
> is
> a
> hit and miss on whether or not it will work correctly.
>
> A few weeks ago I was marked down in a Mock lab for using the class to
> match
> all remaining traffic....but then it was shown as being used in the
> solution
> for the question? :o)
>
> Would you recommend using class-default or would you go for what seems
> to be
> the safest option of seperate classes for layer 3 and layer 2 matching
> their
> acl's (IP and mac matching any any or 0x0 0xFFFF) in my policy map?
>
>
> Thank you in advance for any help you can offer on this
>
> Howard
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