Clarification of the Flowspec Redirect Extended Community
RFC 7674
| Document | Type |
RFC - Proposed Standard
(October 2015; No errata)
Updates RFC 5575
|
|
|---|---|---|---|
| Author | Jeffrey Haas | ||
| Last updated | 2015-10-14 | ||
| Replaces | draft-haas-idr-flowspec-redirect-rt-bis | ||
| Stream | IETF | ||
| Formats | plain text html pdf htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Mach Chen | ||
| Shepherd write-up | Show (last changed 2015-06-24) | ||
| IESG | IESG state | RFC 7674 (Proposed Standard) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Alvaro Retana | ||
| Send notices to | (None) | ||
| IANA | IANA review state | IANA OK - Actions Needed | |
| IANA action state | RFC-Ed-Ack | ||
Internet Engineering Task Force (IETF) J. Haas, Ed.
Request for Comments: 7674 Juniper Networks
Updates: 5575 October 2015
Category: Standards Track
ISSN: 2070-1721
Clarification of the Flowspec Redirect Extended Community
Abstract
This document updates RFC 5575 ("Dissemination of Flow Specification
Rules") to clarify the formatting of the BGP Flowspec Redirect
Extended Community.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc7674.
Copyright 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
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Haas Standards Track [Page 1]
RFC 7674 Flowspec Redirect Extended Community October 2015
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
2.1. BGP Transitive Extended Community Types . . . . . . . . . 5
2.2. Update to BGP Generic Transitive Experimental Use
Extended Community Sub-Types . . . . . . . . . . . . . . 5
2.3. Generic Transitive Experimental Use Extended Community
Part 2 Sub-Types . . . . . . . . . . . . . . . . . . . . 5
2.4. Generic Transitive Experimental Use Extended Community
Part 3 Sub-Types . . . . . . . . . . . . . . . . . . . . 6
3. Security Considerations . . . . . . . . . . . . . . . . . . . 6
4. Normative References . . . . . . . . . . . . . . . . . . . . 7
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 7
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 7
Haas Standards Track [Page 2]
RFC 7674 Flowspec Redirect Extended Community October 2015
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 Virtual Routing and Forwarding (VRF)
instance that matched the flow specification's Network Layer
Reachability Information (NLRI). In RFC 5575, 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"
[RFC4360]. Route Targets [RFC4360] identify this format in the high-
order (Type) octet of the Extended Community and set the value of the
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