Internet DRAFT - draft-rosen-idr-extcomm-iana
draft-rosen-idr-extcomm-iana
IDR Working Group Eric C. Rosen
Internet Draft Cisco Systems, Inc.
Intended Status: Standards Track
Updates: 4360,5701 Yakov Rekhter
Expires: November 30, 2013 Juniper Networks, Inc.
May 30, 2013
IANA Registries for BGP Extended Communities
draft-rosen-idr-extcomm-iana-00.txt
Abstract
This document reorganizes the IANA Registries for the type values and
sub-type values of BGP Extended Communities attribute and the BGP
IPv6-Address-Specific Extended Communities attribute. This is done
in order to remove inter-dependencies among the registries, thus
making it easier for IANA to determine which codepoints are available
for assignment in which registries. This document also clarifies the
information that must be provided to IANA when requesting an
allocation from one or more of these registries. These changes are
compatible with the existing allocations, and thus do not affect
protocol implementations. The changes will however impact the "IANA
Considerations" sections of future protocol specifications. This
document updates RFCs 4360 and 5701.
Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with the
provisions of BCP 78 and BCP 79.
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Copyright and License Notice
Copyright (c) 2013 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
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Table of Contents
1 Introduction .......................................... 4
2 Types, Sub-Types, and Registries ...................... 4
3 Applicability to IPv6 Address Specific EC Attribute ... 5
4 How to Request EC Type and/or Sub-Type Codepoints ..... 5
5 IANA Registries ....................................... 7
5.1 Registries for the TYPE Field ......................... 7
5.1.1 Transitive Types ...................................... 7
5.1.2 Non-Transitive Types .................................. 9
5.2 Registries for the Sub-Type Field ..................... 10
5.2.1 EVPN Sub-Types ........................................ 10
5.2.2 Transitive Two-Octet AS-Specific Sub-Types ............ 10
5.2.3 Non-Transitive Two-Octet AS-Specific Sub-Types ........ 11
5.2.4 Transitive Four-Octet AS-Specific Sub-Types ........... 12
5.2.5 Non-Transitive Four-Octet AS-Specific Sub-Types ....... 12
5.2.6 Transitive IPv4-Address-Specific Sub-Types ............ 13
5.2.7 Non-Transitive IPv4-Address-Specific Sub-Types ........ 13
5.2.8 Transitive Opaque Extended Community Sub-Types ........ 14
5.2.9 Non-Transitive Opaque Extended Community Sub-Types .... 14
5.2.10 Generic Transitive Experimental Use Sub-Types ......... 15
5.3 Registries for IPv6-Address-Specific ECs .............. 15
5.3.1 Transitive Types ...................................... 15
5.3.2 Non-Transitive Types .................................. 16
6 IANA Considerations ................................... 16
7 Security Considerations ............................... 16
8 Acknowledgments ....................................... 16
9 Authors' Addresses .................................... 16
10 Normative References .................................. 17
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1. Introduction
RFC 4360 [RFC4360] defines the BGP "Extended Communities" (EC)
attribute. This attribute consists of a sequence of eight-octet
"extended communities". The high-order octet is defined to be the
"Type" field. Each Type has a range of values for "Transitive
Extended Community Types" and a range of values for "Non-transitive
Extended Community Types". Some of these ranges are further sub-
divided into a sub-range of values to be assigned by IANA under the
"Standards Action (with Early Allocation)" policy a sub-range of
values to be assigned by IANA under the "First Come First Served"
policy, and a sub-range for "experimental use". (See [RFC5226],
[RFC4020], and [RFC3692] for an explanation of these policies.)
For some Extended Community Types, the second octet of the Extended
Community is a "Sub-Type" field, and the remaining six octets are the
"Value" field. These are referred to as "Extended Types". For other
types, there is no Sub-Type field, and the Value field contains seven
octets. These are referred to as "Regular Types".
RFC 4360 is not very specific about how the IANA registries for
Extended Community Types and/or Sub-Types are to be organized, and
this has led to some confusion. The purpose of this document is to
reorganize the registries to make the IANA codepoint allocation task
more straightforward.
2. Types, Sub-Types, and Registries
The high-order octet of an Extended Community will be known as the
"Type Field".
There will be one IANA registry for "Transitive Extended Community
Types" (see section 5.1.1), and one for "Non-transitive Extended
Community Types" (section 5.1.2). Each registry specifies three
ranges, and each range is associated with a particular IANA
allocation policy.
There will be a set of IANA registries for Extended Community Sub-
Types (see section 5.2). Each such registry will have a range of
0x00-0xFF. Values in the range 0x00-0xBF are assignable by IANA
according to the "First Come, First Served" allocation policy of
[RFC5226]. Values in the range 0xC0-0xFF are assignable by IANA
according to the "IETF Review" allocation policy of [RFC5226].
If a particular Type has Sub-Types, that Type's entry in its Type
registry identifies its Sub-Type registry. Note that some Types do
not have Sub-Types. When the request is made to establish a new Type
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registry, the request must specify whether or not there is to be a
Sub-Type registry associated with that Type.
Whether a given Type has Sub-Types is determined when the Type is
initially defined; this cannot be changed later.
3. Applicability to IPv6 Address Specific EC Attribute
RFC 5701 [RFC5701] defines the IPv6 Address Specific Extended
Community to be a 20-octet quantity whose high order two octets are
the "Type Field". The high order octet is either 0x00, indicating a
transitive Extended Community, or 0x40, indicating a Non-transitive
Extended Community. The second octet is said to be a "Sub-Type" and
it is suggested that the Sub-Types are the same as the Sub-Types for
the IPv4-Address-Specific Extended Community. However, the existing
IANA codepoint allocations for this octet do not always match the
corresponding allocations for the IPv4-Address-Specific Extended
Community Sub-Types.
This document modifies RFC 5701 by removing any requirement for the
values of the second octet of the IPv6-Address-Specific Extended
Community Type codepoints to match the codepoints in the
IPv4-Address-Specific Sub-Types registry.
This document requests IANA to create two IPv6-Address-Specific
Extended Community registries, one for transitive communities and one
for non-transitive communities. See section 5.3.
4. How to Request EC Type and/or Sub-Type Codepoints
When a codepoint is needed for a new Extended Community, the
requester should first determine whether an existing Type can be
used. If so, IANA should be asked to allocate a codepoint from the
corresponding Sub-Type registry, if there is one.
If a new Extended Community Type is needed, the requester should ask
IANA to allocate a new type from either the "Transitive Extended
Community Types" registry, the "Non-transitive Extended Community
Types" registry, or both. It is up to the requester to state whether
an allocation is needed from one or both of these registries. When
an allocation from both registries is requested, the requester may
find it desirable for both allocations to share the same low-order
six bits. If so, it is the responsibility of the requester to
explicitly request this of IANA.
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If a new Extended Community Type is needed, and the new Type is to
have Sub-Types, the requester should specify whether an existing Sub-
Type registry can be used for the new Type, or whether a new Sub-Type
registry is needed. (At the current time, every Type that has Sub-
Types is associated with a unique Sub-Type registry. It is possible
that in the future a new Type registry may be created that is
associated with a pre-existing Sub-Type registry.) In either case,
if a new Sub-Type value needs to be allocated from a particular Sub-
Type registry, the request should explicitly identify the registry.
If the creation of a new Sub-Type registry is requested, the range of
values is always 0x00-0xFF. It is recommended that the allocation
policy described in section 2 be used. I.e., 0x00-0xBF to be
allocated by IANA under the "First Come, First Served" policy, and
0xC0-0xFF to be allocated by IANA under the "IETF Review" policy.
Commonly, a new Extended Community is defined such that it can be of
several Types. E.g., one may want to define a new Extended Community
so that it can be either transitive or non-transitive, so that it can
be either of the Two-octet AS Number Type or the Four-octet AS Number
Type, etc. The requester is responsible for explicitly asking IANA
to allocate codepoints in all the necessary Type and/or Sub-Type
registries.
When a new Extended Community is defined, it may be necessary to ask
IANA to allocate codepoints in several Sub-Type registries. In this
case, it is a common practice to ask IANA to allocate the same
codepoint value in each registry. If this is desired, it is the
responsibility of the requester to explicitly ask IANA to allocate
the same value in each registry.
When a new Extended Community Sub-Type codepoint is allocated, it may
also be desirable to allocate a corresponding value in one or both of
the IPv6-Address-Specific Extended Community registries. The
requester is responsible for requesting this allocation explicitly.
If the requester would like the same numerical value to be allocated
in an IPv6-Address-Specific Extended Community registry that is
allocated in some other registry, it is the responsibility of the
requester to explicitly ask this of IANA.
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5. IANA Registries
IANA is to replace the pre-existing BGP Extended Communities
registries with the registries described in this section.
Any Extended Community Type or Sub-type codepoints allocated by IANA
between the date of this document that the date at which the
registries are reorganized must also be incorporated into the new
registry organization. The authors will work with IANA to ensure
that this is done correctly.
The registries reproduced below do not include the "references" or
"date" fields of the registries, because it is difficult to
incorporate those within the 72-character line limitation of RFCs.
The references and associated dates must be copied from the current
registries when the new registries are introduced; the authors will
work with IANA to ensure this this information is carried over
correctly to the new registry organization.
5.1. Registries for the TYPE Field
5.1.1. Transitive Types
This registry contains values of the high-order octet (the "Type
Field") of a Transitive Extended Community.
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Registry Name: BGP TRANSITIVE EXTENDED COMMUNITY TYPES
RANGE REGISTRATION PROCEDURES
0x00-0x3F First Come, First Served
0x80-0x8F Experimental Use (see RFC 3692)
0x90-0xBF Standards Action (early allocation per RFC 4020)
TYPE VALUE NAME
0x00 Transitive Two-Octet AS-specific Extended
Community (Sub-Types are defined in the
"Transitive Two-Octet AS-specific Extended
Community Sub-Types" Registry)
0x01 Transitive IPv4-Address-specific Extended
Community (Sub-Types are defined in the
"Transitive IPv4-Address-specific Extended
Community Sub-Types" Registry)
0x02 Transitive Four-Octet AS-specific Extended
Community (Sub-Types are defined in the
"Transitive Four-Octet AS-specific Extended
Community Sub-Types" Registry)
0x03 Transitive Opaque Extended Community
(Sub-Types are defined in the "Transitive
Opaque Extended Community Sub-Types"
Registry)
0x04 QoS Marking
0x05 CoS Capability
0x06 EVPN (see "EVPN Extended Community Sub-type
Registry")
0x08 Flow spec redirect/mirror to IP next-hop
0x80 Generic Transitive Experimental Extended
Community (Sub-Types are defined in the
"Generic Transitive Experimental Extended
Community Sub-Types" Registry)
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5.1.2. Non-Transitive Types
This registry contains values of the high-order octet (the "Type
Field") of a Non-transitive Extended Community.
Registry Name: BGP NON-TRANSITIVE EXTENDED COMMUNITY TYPES
RANGE REGISTRATION PROCEDURES
0x40-0x7F First Come, First Served
0xC0-0xCF Experimental Use (see RFC 3692)
0xD0-0xFF Standards Action (early allocation per RFC 4020)
TYPE VALUE NAME
0x40 Non-Transitive Two-Octet AS-specific Extended
Community (Sub-Types are defined in the
"Non-Transitive Two-Octet AS-specific Extended
Community Sub-Types" Registry)
0x41 Non-Transitive IPv4-Address-specific Extended
Community (Sub-Types are defined in the
"Non-transitive IPv4-Address-specific Extended
Community Sub-Types" Registry)
0x42 Non-Transitive Four-Octet AS-specific Extended
(Sub-Types are defined in the "Non-Transitive
Four-Octet AS-specific Extended Community
Sub-Types" Registry)
0x43 Non-Transitive Opaque Extended Community
(Sub-Types are defined in the "Non-Transitive
Opaque Extended Community Sub-Types" Registry)
0x44 QoS Marking
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5.2. Registries for the Sub-Type Field
5.2.1. EVPN Sub-Types
This registry contains values of the second octet (the "Sub-Type
field") of an extended community, when the value of the first octet
(the "Type field") is 0x06.
Registry Name: EVPN EXTENDED COMMUNITY SUB-TYPES
RANGE REGISTRATION PROCEDURE
0x00-0xBF First Come, First Served
0xC0-0xFF IETF Review
SUB-TYPE VALUE NAME
0x00 MAC Mobility
0x01 ESI MPLS Label
0x02 ES Import
5.2.2. Transitive Two-Octet AS-Specific Sub-Types
This registry contains values of the second octet (the "Sub-Type
field") of an extended community, when the value of the first octet
(the "Type field") is 0x00.
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Registry Name: TRANSITIVE TWO-OCTET AS-SPECIFIC
EXTENDED COMMUNITY SUB-TYPES
RANGE REGISTRATION PROCEDURE
0x00-0xBF First Come, First Served
0xC0-0xFF IETF Review
SUB-TYPE VALUE NAME
0x02 Route Target
0x03 Route Origin
0x05 OSPF Domain Identifier
0x08 BGP Data Collection
0x09 Source AS
0x0A L2VPN Identifier
0x10 Cisco VPN-Distinguisher
5.2.3. Non-Transitive Two-Octet AS-Specific Sub-Types
This registry contains values of the second octet (the "Sub-Type
field") of an extended community, when the value of the first octet
(the "Type field") is 0x40.
Registry Name: NON-TRANSITIVE TWO-OCTET AS-SPECIFIC
EXTENDED COMMUNITY SUB-TYPES
RANGE REGISTRATION PROCEDURE
0x00-0xBF First Come, First Served
0xC0-0xFF IETF Review
SUB-TYPE VALUE NAME
0x04 Link Bandwidth Extended Community
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5.2.4. Transitive Four-Octet AS-Specific Sub-Types
This registry contains values of the second octet (the "Sub-Type
field") of an extended community, when the value of the first octet
(the "Type field") is 0x02.
Registry Name: TRANSITIVE FOUR-OCTET AS-SPECIFIC EXTENDED
COMMUNITY SUB-TYPES
RANGE REGISTRATION PROCEDURE
0x00-0xBF First Come, First Served
0xC0-0xFF IETF Review
SUB-TYPE VALUE NAME
0x02 Route Target
0x03 Route Origin
0x04 Generic
0x05 OSPF Domain Identifier
0x08 BGP Data Collection
0x09 Source AS
0x10 Cisco VPN Identifier
5.2.5. Non-Transitive Four-Octet AS-Specific Sub-Types
This registry contains values of the second octet (the "Sub-Type
field") of an extended community, when the value of the first octet
(the "Type field") is 0x42.
Registry Name: NON-TRANSITIVE FOUR-OCTET AS-SPECIFIC
EXTENDED COMMUNITY SUB-TYPES
RANGE REGISTRATION PROCEDURE
0x00-0xBF First Come, First Served
0xC0-0xFF IETF Review
SUB-TYPE VALUE NAME
0x04 Generic
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5.2.6. Transitive IPv4-Address-Specific Sub-Types
This registry contains values of the second octet (the "Sub-Type
field") of an extended community, when the value of the first octet
(the "Type field") is 0x01.
Registry Name: TRANSITIVE IPV4-ADDRESS-SPECIFIC
EXTENDED COMMUNITY SUB-TYPES
RANGE REGISTRATION PROCEDURE
0x00-0xBF First Come, First Served
0xC0-0xFF IETF Review
SUB-TYPE VALUE NAME
0x02 Route Target
0x03 Route Origin
0x05 OSPF Domain Identifier
0x07 OSPF Route ID
0x0A L2VPN Identifier
0x0B VRF Route Import
0x10 Cisco VPN-Distinguisher
5.2.7. Non-Transitive IPv4-Address-Specific Sub-Types
This registry contains values of the second octet (the "Sub-Type
field") of an extended community, when the value of the first octet
(the "Type field") is 0x41.
Registry Name: NON-TRANSITIVE IPV4-ADDRESS-SPECIFIC
EXTENDED COMMUNITY SUB-TYPES
RANGE REGISTRATION PROCEDURE
0x00-0xBF First Come, First Served
0xC0-0xFF IETF Review
None Assigned
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5.2.8. Transitive Opaque Extended Community Sub-Types
This registry contains values of the second octet (the "Sub-Type
field") of an extended community, when the value of the first octet
(the "Type field") is 0x03.
Registry Name: TRANSITIVE OPAQUE
EXTENDED COMMUNITY SUB-TYPES
RANGE REGISTRATION PROCEDURE
0x00-0xBF First Come, First Served
0xC0-0xFF IETF Review
SUB-TYPE VALUE NAME
0x06 OSPF Route Type
0x0B Color Extended Community
0x0C Encapsulation Extended Community
0x0D Default Gateway
5.2.9. Non-Transitive Opaque Extended Community Sub-Types
This registry contains values of the second octet (the "Sub-Type
field") of an extended community, when the value of the first octet
(the "Type field") is 0x43.
Registry Name: NON-TRANSITIVE OPAQUE
EXTENDED COMMUNITY SUB-TYPES
RANGE REGISTRATION PROCEDURE
0x00-0xBF First Come, First Served
0xC0-0xFF IETF Review
SUB-TYPE VALUE NAME
0x00 BGP Origin Validation State
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5.2.10. Generic Transitive Experimental Use Sub-Types
Registry Name: BGP GENERIC NON-TRANSITIVE EXPERIMENTAL USE
EXTENDED COMMUNITY SUB-TYPES
RANGE REGISTRATION PROCEDURE
0x00-0xBF First Come, First Served
0xC0-0xFF IETF Review
SUB-TYPE VALUE NAME
0x06 Flow spec traffic-rate
0x07 Flow spec traffic-action
0x08 Flow spec redirect
0x09 Flow spec traffic-remarking
0x0A Layer2 Info Extended Community
5.3. Registries for IPv6-Address-Specific ECs
5.3.1. Transitive Types
This registry contains values of the two high-order octets of an
IPv6-Address-Specific Extended Communities attribute.
Registry Name: TRANSITIVE IPV6 ADDRESS SPECIFIC
EXTENDED COMMUNITY TYPES
RANGE REGISTRATION PROCEDURE
0x0000-0x00FF First Come, First Served
TYPE VALUE NAME
0x0002 Route Target
0x0003 Route Origin
0x0004 OSPFv3 Route Attributes (deprecated)
0x000B VRF Route Import
0x0010 Cisco VPN-Distinguisher
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5.3.2. Non-Transitive Types
This registry contains values of the two high-order octets of an
IPv6-Address-Specific Extended Communities attribute.
Registry Name: NON-TRANSITIVE IPV6 ADDRESS SPECIFIC
EXTENDED COMMUNITY TYPES
RANGE REGISTRATION PROCEDURE
0x4000-0x40FF First Come, First Served
None assigned
6. IANA Considerations
Instructions for IANA are found in section 5.
7. Security Considerations
No security considerations are raised by this document.
8. Acknowledgments
We thank Amanda Baber of IANA for educating us on some of the
problems faced by IANA staff when responding to requests for BGP
Extended Community Type and Sub-Type codepoint allocations.
9. Authors' Addresses
Yakov Rekhter
Juniper Networks
1194 North Mathilda Ave.
Sunnyvale, CA 94089
Email: yakov@juniper.net
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Eric C. Rosen
Cisco Systems, Inc.
1414 Massachusetts Avenue
Boxborough, MA, 01719
Email: erosen@cisco.com
10. Normative References
[RFC3692] "Assigning Experimental and Testing Numbers Considered
Useful", Narten, RFC 3692, January 2004
[RFC4020] "Early IANA Allocation of Standards Track Code Points",
Kompella, Zinin, RFC 4020, February 2005
[RFC4360] "BGP Extended Communities Attribute", Sangli, Tappan,
Rekhter, RFC 4360, February 2006
[RFC5226] "Guidelines for Writing an IANA Considerations Section in
RFCs", Narten, Alvestrand, RFC 5226, May 2008
[RFC5701] "IPv6 Address Specific BGP Extended Community Attribute",
Rekhter, RFC 5701, November 2009
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