[mpls] I-D Action: draft-ietf-mpls-sfc-04.txt

internet-drafts@ietf.org Tue, 20 November 2018 09:45 UTC

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Subject: [mpls] I-D Action: draft-ietf-mpls-sfc-04.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Multiprotocol Label Switching WG of the IETF.

        Title           : An MPLS-Based Forwarding Plane for Service Function Chaining
        Authors         : Adrian Farrel
                          Stewart Bryant
                          John Drake
	Filename        : draft-ietf-mpls-sfc-04.txt
	Pages           : 28
	Date            : 2018-11-20

   Service Function Chaining (SFC) is the process of directing packets
   through a network so that they can be acted on by an ordered set of
   abstract service functions before being delivered to the intended
   destination.  An architecture for SFC is defined in RFC7665.

   The Network Service Header (NSH) can be inserted into packets to
   steer them along a specific path to realize a Service Function Chain.

   Multiprotocol Label Switching (MPLS) is a widely deployed forwarding
   technology that uses labels placed in a packet in a label stack to
   identify the forwarding actions to be taken at each hop through a
   network.  Actions may include swapping or popping the labels as well,
   as using the labels to determine the next hop for forwarding the
   packet.  Labels may also be used to establish the context under which
   the packet is forwarded.

   This document describes how Service Function Chaining can be achieved
   in an MPLS network by means of a logical representation of the NSH in
   an MPLS label stack.  It does not deprecate or replace the NSH, but
   acknowledges that there may be a need for an interim deployment of
   SFC functionality in brownfield networks.

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