[nsp] DSCP transparency

Eduard Metz emetz at thrupoint.net
Fri Mar 14 11:50:31 EST 2003


It's beyond me why certain interfaces would do implicit DSCP rewrite, but it
would be good to know if it is indeed the case (if so it seems like a bug
indeed).

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net]On Behalf Of George Boulescu
> Sent: vrijdag 14 maart 2003 11:00
> To: cisco-nsp at puck.nether.net
> Subject: RE: [nsp] DSCP transparency
>
>
>
> > Sounds strange. Are you sure you receive marked traffic on
> the GSR (from the
> > ISP)?
>
> Yes I'm shure.
>
> > > <ISP router>---LCOC12c-<GSR>-LC-1GBIT------<7500>
>
> I discovered an interesting thing: the packets passed to an
> E3 interface
> keep their DSCP. The only difference between the Gig and the
> E3 interfaces
> is the MTU. The POS and the E3 have the same MTU, 4470, but the Gig
> interface has 1500, as ussual. I suspect that this is a bug.
>
> --
>
> George Boulescu
> Senior Network Engineer
> RoEduNet Bucharest NOC
> CCAI, CCNA
>
>
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