Provider Provisioned VPN WG Hamid Ould-Brahim
Internet Draft Nortel Networks
Expiration Date: July 2002 Bryan Gleeson
Tahoe Networks
Yakov Rekhter
Juniper Networks
February 2002
Global Unique Identifiers (GID)
draft-ouldbrahim-ppvpn-gid-00.txt
Status of this Memo
This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026 [RFC-2026].
Internet-Drafts are working documents of the Internet Engineering
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Abstract
The existing VPN solutions [VR, 2547, L2VPN-Kompella] use in their
control plane globally unique identifiers. This document describes
the format of these identifiers (called GIDs). If any future VPN
solutions require globally unique identifiers, they can re-use the
format described in this document.
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ID Summary
RELATED DOCUMENTS
[RFC2685], [RFC2547bis], [VR], [L2VPN-Kompella]
WHERE DOES IT FIT IN THE PICTURE OF THE SUB-IP WORK
Fits the PPVPN box.
WHY IS IT TARGETED AT THIS WG
This ID proposes a format for generating unique global identifiers.
JUSTIFICATION
This draft proposes a format for generating unique global
identifiers to be used by various VPN proposals.
1. Introduction
The existing VPN solutions [VR, RFC2547bis, L2VPN-Kompella] use in
their control plane globally unique identifiers. This document
describes the format of these identifiers, called GIDs. If any
future VPN solutions require globally unique identifiers, they can
re-use the format described in this document.
The GID is based on BGP extended community format. No assumption is
made on the usage of the GID. It is up to the VPN solutions to
describe the usage of the GID. However, it is important to stress
that GIDs have to be unique only within the context of their
particular application, but need not be unique across applications.
An application can interpret the GID structure according to its own
usage.
2. Global Identifier Format
Each GID is encoded as an eight octet quantity, as follows:
- Type Field : 1 or 2 octets
- Value Field : Remaining octets
Type Field:
The value of the high-order octet will determine if it is a
regular type or extended type. The size of the Type Field
for
Ould-Brahim, et al. February 2002 [Page 2] Internet-Draft draft-ouldbrahim-ppvpn-gid-00.txt February 2002
regular types is 1 octet and the size of the Type Field for
extended types is 2 octets.
All GID types must have a unique high-order octet.
The high-order octet of the Type Field is as shown below:
First bit (MSB) : IANA authority bit
Value 0 : IANA assignable type
Value 1 : Vendor-specific types
Second bit : Reserved
Remaining 6 bits : Indicates the structure of the
GID
Value Field:
The encoding of the Value Field dependents on the "type" of
the GID as specified by the Type Field.
This document introduces a few types and defines the Value Field for
those types.
- Type 0x00:
This is an extended type with a Type Field comprising of 2 octets
and Value Field of 6 octets.
The value of the high-order octet of this extended type is
0x00 and the low-order octet of this extended type is used to
indicate subtypes.
The Value field is structured as follows:
* Administrator sub-field: 2 octets
* Assigned Number sub-field: 4 octets
The Administrator sub-field must contain an Autonomous System
number. If this ASN is from the public ASN space, it must have
been assigned by the appropriate authority (use of ASN values
from the private ASN space is strongly discouraged). The
Assigned Number sub-field contains a number from a numbering space
which is administered by the enterprise to which the ASN has been
assigned by an appropriate authority.
- Type 0x01
This is an extended type with a Type Field of 2 octets and a Value
Field of 6 octets.
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The value of the high-order octet of this extended type is
0x01. The low-order octet of this extended type is used to indicate
subtypes.
The Value field consists of two sub-fields (6 octets):
* Administrator sub-field: 4 octets
* Assigned Number sub-field: 2 octets
The Administrator sub-field must contain an IP address. If this IP
address is from the public IP address space, it must have been
assigned by an appropriate authority (use of addresses from the
private IP address space is strongly discouraged). The Assigned
Number sub-field contains a number from a numbering space which
is administered by the enterprise to which the IP address has
been assigned.
- Type 0x02
This is an extended type with a Type Field of 2 octets
and a Value Field of 6 octets.
The value of the high-order octet of this extended type is
0x02. The low-order octet of this extended type is used to
indicate subtypes.
The Value Field consists of two sub-fields.
* Administrator sub-field: 4 octets
* Assigned Number sub-field: 2 octets
The Administrator sub-field must contain a 4-octets Autonomous
System number. If this ASN is from the public ASN space, it must
have been assigned by the appropriate authority (use of ASN values
from the private ASN space is strongly discouraged). The
Assigned Number sub-field contains a number from a numbering space
which is administered by the enterprise to which the ASN has been
assigned by an appropriate authority.
- Type 0x04
This is a regular type with a type field of 1 octet and a Value
Field of 7 octets.
The Value Field consists of two sub-fields.
* Administrator sub-field: 3 octets
* Assigned Number sub-field: 4 octets
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The Administrator sub-field must contain a 3-octet
Organizationally Unique Identifier, as defined in [OUI].
Assignment of OUIs is carried out by the IEEE [OUI-Registry].
The Assigned Number sub-field contains a number from a numbering
space which is administered by the enterprise to which the OUI
has been assigned.
3. IANA Considerations
We suggest that within the context of a particular application that
uses GIDs, the GID Type Field space be partitioned as follows. The
Type Field values 0x00-0x3f (0x0000-0x3fff when expressed as
extended-types) be assigned by IANA using the "First Come First
Served" policy defined in RFC 2434. Type values 0x80-0xbf (0x8000-
0xbfff when expressed as extended-types) are for vendor-specific
types, and values in this range are not to be assigned by IANA.
4. Security Considerations
This document defines the format for generating global identifier
without specifying usage.
5. References
[BGP-COMM] Ramachandra, Tappan, et al., "BGP Extended Communities
Attribute", draft-ramachandra-bgp-ext-communities-09.txt
June 2001, work in progress
[L2VPN-Kompella] Kompella, K., et al., "Layer 2 VPNs Over Tunnels",
draft-kompella-ppvpn-l2vpn-01.txt.
[RFC2547bis] Rosen E., et al, "BGP/MPLS VPNs", work in progress.
[RFC-2685] Fox B., et al, "Virtual Private Networks Identifier", RFC
2685, September 1999.
[VR], Ould-Brahim, H., et al., "Network-based IP VPNs using Virtual
Router architecture", draft-ietf-ppvpn-vr-01.txt,
[OUI] ANSI/IEEE, Std 802-1990 "IEEE Standards for Local and
Metropolitan Area Networks".
[OUI-Registry] "http://standards.ieee.org/regauth/oui/index.shtml"
5. Author's Addresses
Hamid Ould-Brahim
Nortel Networks
P O Box 3511 Station C
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Ottawa, ON K1Y 4H7, Canada
Email: hbrahim@nortelnetworks.com
Phone: +1 613 765 3418
Bryan Gleeson
Tahoe Networks
3052 Orchard Drive
San Jose, CA 95134 USA
Email: bryan@tahoenetworks.com
Yakov Rekhter
Juniper Networks
1194 N. Mathilda Avenue
Sunnyvale, CA 94089
E-mail: yakov@juniper.net
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