Generic Subtype for BGP Four-octet AS specific extended community
draft-ietf-idr-as4octet-extcomm-generic-subtype-09
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Network Working Group D. Rao
Internet-Draft Cisco Systems
Intended status: Standards Track P. Mohapatra
Expires: January 9, 2017 Sproute Networks
J. Haas
Juniper Networks
July 8, 2016
Generic Subtype for BGP Four-octet AS specific extended community
draft-ietf-idr-as4octet-extcomm-generic-subtype-09
Abstract
Maintaining the current best practices with communities, ISPs and
enterprises that are assigned a 4-octet AS number may want the BGP
UPDATE messages they receive from their customers or peers to include
a 4-octet AS specific BGP extended community. This document defines
a new sub-type within the four-octet AS specific extended community
to facilitate this practice.
Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on January 9, 2017.
Copyright Notice
Copyright (c) 2016 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
Rao, et al. Expires January 9, 2017 [Page 1]
Internet-Draft 4octet extcomm generic sub-type July 8, 2016
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
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described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements Language . . . . . . . . . . . . . . . . . . . 3
2. Generic Sub-type Definition . . . . . . . . . . . . . . . . . . 3
3. Deployment Considerations . . . . . . . . . . . . . . . . . . . 4
4. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 5
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
6. Security Considerations . . . . . . . . . . . . . . . . . . . . 5
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 5
7.1. Normative References . . . . . . . . . . . . . . . . . . . 5
7.2. Informative References . . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 6
Rao, et al. Expires January 9, 2017 [Page 2]
Internet-Draft 4octet extcomm generic sub-type July 8, 2016
1. Introduction
Maintaining the current best practices with communities, ISPs and
enterprises that are assigned a 4-octet AS number may want the BGP
UPDATE messages they receive from their customers or peers to include
a 4-octet AS specific extended community. This document defines a
new sub-type within the four-octet AS specific extended community to
facilitate this practice.
For example, [RFC1998] describes an application of BGP community
attribute ([RFC1997]) to implement flexible routing policies for
sites multi-homed to one or multiple providers. In a two-octet AS
environment, the advertised routes are usually associated with a
community attribute that encodes the provider's AS number in the
first two octets of the community and a LOCAL_PREF value in the
second two octets of the community. The community attribute signals
the provider edge routers connected to the site to set the
corresponding LOCAL_PREF on their advertisements to the IBGP mesh. In
this way, customers can put into practice topologies like active-
backup.
When such a provider is assigned a four-octet AS number, the existing
mechanism of using communities is not sufficient since the AS portion
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