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Cell Relay Retreat>MPLS WG Archive>month:2000-Dec> msg00226



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MPLS and fragmentation...

  • From: Ben Black <ben@layer8.net>
  • Date: Wed, 13 Dec 2000 15:08:25 -0800
  • Cc: "'Serge Maskalik'" <serge@ivmg.net>, Steve Elias <eli@cisco.com>, mpls@UU.NET
  • User-Agent: Mutt/1.2i

On Wed, Dec 13, 2000 at 05:42:45PM -0500, Krishnan, Vijay G. wrote:
> Hi,
> 
> I understand that the RSVP-TE finds the path MTU of an LSP based on the
> minimum MTU size of the router interfaces on the path. The source (ingress
> LSR or LER) can send the packets with this size to avoid fragmentation. Can
> the packet size overshoot the path MTU due to addition of labels
> (hierarchical tunnels or something) on its path, which might require
> fragmentation? 
> 

The MTU determined should take into account whatever the depth of the label
stack actually is for the given LSP.  Fragmentation is not avoided, it is
simply done, if required, outside the MPLS domain.


ben