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Cell Relay Retreat>MPLS WG Archive>month:2003-Mar> msg00403



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[PWE3] MPLS PID

  • From: Alia Atlas <aatlas@avici.com>
  • Date: Mon, 31 Mar 2003 22:28:49 -0500
  • Cc: "'Lloyd Wood'" <L.Wood@eim.surrey.ac.uk>, pwe3@ietf.org, mpls@UU.NET

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.

I don't believe that it is at all impossible to use the first nibble to 
determine a potential IPv4 packet and then use the header checksum to 
confirm it.  This method works just fine.

>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.

But doing ECMP on the label stack yields much larger micro-flows than doing 
ECMP based upon the IP headers inside, if possible.  Thus, there is worse 
load-balancing of the flows across the network.

Alia

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