From: Emir trhulj (skimad@gmail.com)
Date: Thu May 18 2006 - 02:00:05 ART
Hello,
Accoding to the Doco
"*Note *CAR and DCAR can only be used with IP traffic. Non-IP traffic is not
rate limited.
CAR and DCAR can be configured on an interface or subinterface. However, CAR
and DCAR are not supported on the Fast EtherChannel, tunnel, or PRI
interfaces, nor on any interface that does not support Cisco Express
Forwarding (CEF).
CEF must be enabled on the interface before you configure CAR or DCAR.
CAR is not supported for Internetwork Packet Exchange (IPX) packets."
I would use an ACL to match the traffic and then use MQC if I was not
allowed to use CEF.
Emir
On 5/18/06, Koen Zeilstra <koen@koenzeilstra.com> wrote:
>
> In a workbook a task was mentioned to rate limit traffic at a certain
> amount and don't use cef. The solution was a police based method using
> MQC. So they didn't use rate limiting. I read that as since rate limiting
> relies on CEF. Not sure if this is true.
>
> It would defenately help if someone pointed to a valid source which
> clearly states:
>
> no ip cef for QOS --> don't use blah di blah
> use ip cef for QOS --> use blah di blah
>
>
> -----------------------
> A fool must now and then be right by chance.
>
> On Wed, 17 May 2006, Roberto Fernandez wrote:
>
> |
> | I think it is restricting you to NOT use NBAR, just that. MQC itself
> | does not requires CEF, not CAR either requires it. (I understand)
> |
> | Best Regards,
> | Roberto
> |
> | -----Original Message-----
> | From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> | Koen Zeilstra
> | Sent: Wednesday, May 17, 2006 2:02 PM
> | To: Daniel Kutchin
> | Cc: ccielab@groupstudy.com
> | Subject: Re: CEF and QoS, again
> |
> | In other words (forget my previous email):
> |
> | When the QOS task requires you to "not use cef" what options do you have
> |
> | left?
> |
> | And what about restricting to use cef for your solution?
> |
> | grtz,
> |
> | Koen
> |
> | -----------------------
> | unix soit qui mal y pense
> |
> | On Tue, 16 May 2006, Daniel Kutchin wrote:
> |
> | | Hi Taylor -
> | |
> | | 4) Disable CEF for PPPoFR (i.e. Virtual Templates)
> | |
> | | BTW: Always enable CEF in order to use NBAR (In the book according to
> | Odom
> | | Chapter p.222)
> | |
> | | Daniel
> | |
> | | ----- Original Message -----
> | | From: "Wang, Ting (Taylor)" <wangting@avaya.com>
> | | To: <ccielab@groupstudy.com>
> | | Sent: Sunday, May 14, 2006 4:09 AM
> | | Subject: RE: CEF and QoS, again
> | |
> | |
> | | Hi Group,
> | | Sorry missed the text in last mail.
> | | I find some discussion on when CEF need to be enabled for QoS, but
> | | still not quite sure. From previous discussion, it concludes that CEF
> | | need to be enabled when you are using NBAR, marking your traffic or
> | | CAR. Is that correct? For marking, there is several appoach like
> | police,
> | | MQC set, PBR, and CAR. In which case the CEF is a must, and in which
> | | case it is recommended or not required?
> | | There is another saying "you don't have to enable NBAR to mark traffic
> | | via protocol (for well-known protocols at least)." " CEF and QoS are
> | | mutually exclusive." How to understand it? In which case we need to
> | | disable the CEF for QOS?
> | | Following are conclusion from some past discussion, any idea on that?
> | | 1) There are no real reasons that you want to disable CEF unless you
> | | were running into a bug where's it causing problems.
> | | 2) Disable CEF when using proxy-arp, 'cause this can cause a routing
> | | loop
> | | 3) If you wanted to load-balance by the routing protocol then you
> | would
> | | not want cef . The logic being that cef would assume the load
> | balancing
> | | functions over the routing protocol once populated.
> | |
> | | Thanks,
> | | Taylor
> | |
> | |
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