Clarification of the Flowspec Redirect Extended Community
draft-ietf-idr-flowspec-redirect-rt-bis-03

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Internet Engineering Task Force                             J. Haas, Ed.
Internet-Draft                                          Juniper Networks
Updates: 5575 (if approved)                            November 24, 2014
Intended status: Standards Track
Expires: May 28, 2015

       Clarification of the Flowspec Redirect Extended Community
               draft-ietf-idr-flowspec-redirect-rt-bis-03

Abstract

   This document clarifies the formatting of the the BGP Flowspec
   Redirect Extended Community, originally documented in RFC 5575
   (Dissemination of Flow Specification Rules).

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on May 28, 2015.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   3.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   4.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   Dissemination of Flow Specification Rules [RFC5575], commonly known
   as BGP Flowspec, provided for a BGP Extended Community [RFC4360] that
   served to redirect traffic to a VRF routing instance that matched the
   flow specification NLRI.  In that RFC, the Redirect Extended
   Community was documented as follows:

   : +--------+--------------------+--------------------------+
   : | type   | extended community | encoding                 |
   : +--------+--------------------+--------------------------+
   : | 0x8008 | redirect           | 6-byte Route Target      |
   : +--------+--------------------+--------------------------+
   :
   : [...]
   :
   : Redirect:  The redirect extended community allows the traffic to be
   : redirected to a VRF routing instance that lists the specified
   : route-target in its import policy.  If several local instances
   : match this criteria, the choice between them is a local matter
   : (for example, the instance with the lowest Route Distinguisher
   : value can be elected).  This extended community uses the same
   : encoding as the Route Target extended community [RFC4360].
   : [...]
   :
   : 11. IANA Considerations
   : [...]
   :
   : The following traffic filtering flow specification rules have been
   : allocated by IANA from the "BGP Extended Communities Type -
   : Experimental Use" registry as follows:
   : [...]
   :
   : 0x8008 - Flow spec redirect

   The IANA registry of BGP Extended Communities clearly identifies
   communities of specific formats.  For example, "Two-octet AS Specific
   Extended Community" [RFC4360], "Four-octet AS Specific Extended
   Community" [RFC5668] and "IPv4 Address Specific Extended Community"

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   [RFC4360].  Route Targets [RFC4360] identify this format in the high-
   order (Type) octet of the Extended Community and set the value of the
   low-order (Sub-Type) octet to 0x02.  The Value field of the Route
   Target Extended Community is intended to be interpreted in the
   context of its format.

   Since the Redirect Extended Community only registered a single code-
   point in the IANA BGP Extended Community registry, a common
   interpretation of the redirect extended community's "6-byte route