Service Chaining using Virtual Networks with BGP

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Document Type Active Internet-Draft (individual)
Last updated 2015-07-20 (latest revision 2015-07-06)
Replaces draft-mackie-sfc-using-virtual-networking, draft-rfernando-bess-service-chaining
Replaced by draft-ietf-bess-service-chaining
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INTERNET-DRAFT                                               R. Fernando
Intended Status: Informational                                     Cisco
Expires: January 6, 2016                                       S. Mackie
                                                                  D. Rao
                                                              B. Rijsman
                                                            M. Napierala
                                                            July 5, 2015

            Service Chaining using Virtual Networks with BGP



   This document describes how service function chains (SFC) can be
   applied to traffic flows using routing in a virtual (overlay) network
   to steer traffic between service nodes. Chains can include services
   running in routers, on physical appliances or in virtual machines.
   Service chains have applicability at the subscriber edge, business
   edge and in multi-tenant datacenters. The routing function into SFCs
   and between service functions within an SFC can be performed by
   physical devices (routers), be virtualized inside hypervisors, or run
   as part of a host OS.

   A BGP control plane for route distribution is used to create virtual
   networks implemented using IP MPLS, VXLAN or other suitable
   encapsulation, where the routes within the virtual networks cause
   traffic to flow through a sequence of service nodes that apply packet
   processing functions to the flows. Two techniques are described: in
   one the service chain is implemented as a sequence of distinct VPNs
   between sets of service nodes that apply each service function; in
   the other, the routes within a VPN are modified through the use of
   special route targets and modified next-hop resolution to achieve the
   desired result.

   In both techniques, service chains can be created by manual
   configuration of routes and route targets in routing systems, or
   through the use of a controller which contains a topological model of
   the desired service chains.

   This document also contains discussion of load balancing between

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   network functions, symmetric forward and reverse paths when stateful
   services are involved, and use of classifiers to direct traffic into
   a service chain.

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
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Copyright and License Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors. All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   ( in effect on the date of
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   described in the Simplified BSD License.

Table of Contents

   1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1  Terminology . . . . . . . . . . . . . . . . . . . . . . . .  6
   2  Service Function Chain Architecture Using Virtual Networking  .  8
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