A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Service Chaining using Virtual Networks with BGP
Authors : Rex Fernando
Stuart Mackie
Dhananjaya Rao
Bruno Rijsman
Maria Napierala
Filename : draft-fm-bess-service-chaining-00.txt
Pages : 32
Date : 2015-07-06
Abstract:
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
network functions, symmetric forward and reverse paths when stateful
services are involved, and use of classifiers to direct traffic into
a service chain.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-fm-bess-service-chaining/
There's also a htmlized version available at:
https://tools.ietf.org/html/draft-fm-bess-service-chaining-00
Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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