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Re: IPSEC and GRE, does CEF works? posted 01/11/2005
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Regardless of the MTU issues.

>From my production experience it works with enabled CEF.
The only situation when we needed to disable CEF is spoke-to-spoke via hub
routing.
CEF needed to be disabled on hub.

Also I believe that it is related to particular IOS version.
There's probably a situation when you need to disable CEF in order to make
it work with simple configuration.

-R
CCIE #12944


----- Original Message ----- 
From: "Dan Shechter" <danshtr@xxxxxxxxx>
To: <ccielab@xxxxxxxxxxxxxx>
Sent: Tuesday, January 11, 2005 8:30 AM
Subject: IPSEC and GRE, does CEF works?


> Hello all,
>
> Cisco recommends configuring VPN with IPSEC/GRE combinations.
>
> Does CEF works in such configuration?
>
> Can IP switching, QOS classifying, GRE encapsulation, encryption (HW
> or SW) and QOS congestion management be done in a single interrupt?
>
> My hardware is 3825 and 7200 with VAM2, but  a generic answer will be
> more educating for me.
>
> Thank you all,
> Dan
>
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