From: Luan Nguyen (luan.m.nguyen@gmail.com)
Date: Fri Jun 13 2008 - 10:43:18 ART
TOS/DSCP are copied without the need for QOS Pre-classified.
Pre-classified just made a copy of the original packet, so that QOS
mechanism can look at other stuffs besides the tos/dscp, like port number
for example. It doesn't change how thing works.
-Luan
On Fri, Jun 13, 2008 at 7:10 AM, Gyuri Gabor <Gyori.Gabor@kfkizrt.hu> wrote:
> Dear group member!
>
> I tried to find the exact description of qos-preclassify command on CCO,
> but I
> could not.
> Here is an explanation I could extract:
>
> If I have a main interface that:
> - has service-policy output based on L4 pclassification,
> - it is a GRE/IPSec tunnel endpoint, no native traffic is passing through,
> then the serice-policy has no effect, as the outgoing packets are allready
> encapsulated into tunnels, so L4 filter does not match..
>
> Applying qos pre-classify on main interface case that the service-policy is
> applied on output packets before encapsulation.
>
> My questions:
> - Do I think right?
> - Is it possible to implement queuing on main interface this way, or only
> marking will work?
> - Is DSCP copied to GRE/IPSEC tunnel header automatically with or without
> using qos pre-classify?
>
> Thanks,
> Gabor
>
>
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