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Cell Relay Retreat>MPLS-OPS Archive>month:2002-Jul> msg00049



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Re: MPLS and Frame Relay

  • From: Sidnie Feit <sfeit@vnet.net>
  • Date: Sun, 14 Jul 2002 11:27:35 -0400
  • Resent-Date: Sun, 14 Jul 2002 12:26:03 -0400
  • To: mpls-ops@mplsrc.com
  • X-Sender: sfeit@pop.vnet.net

With MPLS, packets are placed onto a pre-existing path, so maintaining 
order is not a problem unless the path is changed (which should be an 
uncommon event). Even then, usually a new path is stably set up before 
traffic is switched over.

Frame Relay can be directly integrated into MPLS -- if the Frame Relay 
switches have been updated to perform label distribution and routing. The 
DLCI is used as the label.
See RFC 3034.

Beyond this, draft-martini-l2circuit-encap-mpls decribes how frame relay 
frames can be carried as MPLS payloads across label switched paths that 
span any types of media.

The frame relay header is replaced by a control word that contains the 
FECN, BECN, and DE bits. There also is a sequence number field, but note 
that out-of order delivery should be a rare event on an MPLS network.

Best regards,
Sidnie Feit

 >
 >
 > Date: 2002/07/13 Sat PM 10:32:35 EDT
 > To: <mpls-ops@mplsrc.com>
 > Subject: [MPLS-OPS]: MPLS and Frame Relay
 >
 > Has anyone heard if there has been any work regarding Frame Relay over MPLS
 > and whether there is a way to guarrantee frames will not arrive out of
 > sequence?    Possibly some new drafts that I haven't heard of have been
 > developed or something?
 >
 > Thanks in advance
 >
 > Brian
 > 


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