From: Daniel Kutchin (daniel@kutchin.com)
Date: Mon May 15 2006 - 19:47:17 ART
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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