The MPLS WG Archive

["Thomas D. Nadeau" <tnadeau@cisco.com>]

At 02:40 PM 3/31/2003 -0800, Shahram Davari wrote:
>I agree with Lloyd. Sniffing IP packets in the middle of an MPLS network 
>is fundamentally wrong, and is impossible to do for all ECMP 
>implementations such as the one that I described
>in earlier emails in which both the first nibble and the CRC are used to 
>detect IP.
>
>The best way to solve this problem is to do ECMP only based on label 
>stack. Doing so should be
>easier than introducing new standard.

         Sharam, it sounds like you are introducing a new standard
by insisting that ECMP only be based on the label stack.

         --Tom



>-Shahram
>
>
> >-----Original Message-----
> >From: Lloyd Wood [mailto:l.wood@eim.surrey.ac.uk]
> >Sent: Sunday, March 30, 2003 6:11 PM
> >To: Eric Rosen
> >Cc: jeremy.de_clercq@alcatel.be; David Allan; 'Scott W Brim';
> >pwe3@ietf.org; mpls@UU.NET
> >Subject: Re: [PWE3] MPLS PID
> >
> >
> >On Thu, 27 Mar 2003, Eric Rosen wrote:
> >
> >> 1. The  only  reason for  a  PID  field in  MPLS  and/or
> >PWE3  is to  allow
> >>    intermediate routers to determine whether a particular
> >MPLS payload is an
> >>    IP packet or not.
> >
> >which is a layer violation, and shouldn't be done.
> >
> >>    There are a number  of reasons why this is useful, and
> >no one has argued
> >>    that this is not useful.
> >
> >not appropriate, more like.
> >
> >if you're going to sniff for an IP packet (so you can sniff TCP/UDP or
> >higher) you might want to ask why you even have any form of mpls
> >label stack in there in the first place.
> >
> >if you're not separating out your ip flows via explicit mpls label,
> >why not?
> >
> >L.
> >
> ><http://www.ee.surrey.ac.uk/Personal/L.Wood/><L.Wood@ee.surrey.ac.uk>
> >_______________________________________________
> >pwe3 mailing list
> >pwe3@ietf.org
> >https://www1.ietf.org/mailman/listinfo/pwe3
> >
>_______________________________________________
>pwe3 mailing list
>pwe3@ietf.org
>https://www1.ietf.org/mailman/listinfo/pwe3


http://www.elsevier-international.com/catalogue/title.cfm?ISBN=155860751X