Network Working Group Kamran Raza
Internet Draft Cisco Systems
Intended Status: Standards Track
Expiration Date: October 27, 2010
April 28, 2010
LDP Typed Wildcard PW FEC Elements
draft-raza-l2vpn-pw-typed-wc-fec-00.txt
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Abstract
An extension to the Label Distribution Protocol (LDP) defines the
general notion of a "Typed Wildcard Forwarding Equivalence Class
(FEC) Element"". This can be used when it is desired to request all
label bindings for a given type of FEC Element, or to release or
withdraw all label bindings for a given type of FEC element.
However, a typed wildcard FEC element must be individually defined
for each type of FEC element. This specification defines the typed
wildcard FEC elements for the Pseudowire Identifier (PW Id) and
Generalized Pseudowire Identifier (Gen. PW Id) FEC types.
Conventions used in this document
The keywords "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
Table of Contents
1. Introduction .................................................. 2
2. Typed Wildcard for PWid FEC Element ........................... 3
3. Typed Wildcard for Generalized PWid FEC Element ............... 3
4. Security Considerations ....................................... 3
5. IANA Considerations ........................................... 4
6. Acknowledgments ............................................... 4
7. References .................................................... 4
7.1 Normative References ...................................... 4
7.2 Informative References .................................... 4
Author's Address.................................................. 4
1. Introduction
An extension [TYPED-WC] to the Label Distribution Protocol (LDP)
[RFC5036] defines the general notion of a "Typed Wildcard Forwarding
Equivalence Class (FEC) Element". This can be used when it is
desired to request all label bindings for a given type of FEC
Element, or to release or withdraw all label bindings for a given
type of FEC element. However, a typed wildcard FEC element must be
individually defined for each type of FEC element.
[RFC4447] defines the "PWid FEC Element" and "Generalized PWid FEC
Element" but it does not specify Typed Wildcard format for these
elements. This document specifies the format of the Typed Wildcard
FEC for the "PWid FEC Element" and the "Generalized PWid FEC
Element" defined in [RFC4447]. The procedures for Typed Wildcard
processing for PWid and Generalized PWid FEC Elements are same as
described in [TYPED-WC] for any typed wildcard FEC Element type.
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2. Typed Wildcard for PWid FEC Element
The format of the PWid FEC Typed Wildcard FEC is:
0 1 2
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Typed Wcard | Type = PWid | Len = 0 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: Format of PWid Typed Wildcard FEC Element
where:
Typed Wcard (one octet): as specified in [TYPED-WC]
FEC Element Type (one octet): PWid FEC Element (type 0x80
[RFC4447])
Len FEC Type Info (one octet): Zero. (There is no additional FEC
info)
3. Typed Wildcard for Generalized PWid FEC Element
The format of the Generalized PWid FEC Typed Wildcard FEC is:
0 1 2
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Typed Wcard | Type=Gen.PWid | Len = 0 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 2: Format of Generalized PWid Typed Wildcard FEC Element
where:
Typed Wcard (one octet): as specified in [TYPED-WC]
FEC Element Type (one octet): Generalized PWid FEC Element (type
0x81 [RFC4447])
Len FEC Type Info (one octet): Zero. (There is no additional FEC
info)
When Generalized PWid FEC Typed Wildcard is used, "PW Grouping ID
TLV" [RFC4447] MUST NOT be present in the same message.
4. Security Considerations
No new security considerations beyond that apply to the base LDP
specification [RFC5036], [RFC4447] and [MPLS_SEC] apply to the use of
the PW Typed Wildcard FEC Element types described in this document.
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5. IANA Considerations
This document defines no new element for IANA Consideration.
6. Acknowledgments
The author would like to thank Eric Rosen, M. Siva, and Zafar Ali for
review of this document.
This document was prepared using 2-Word-v2.0 template.dot.
7. References
7.1. Normative References
[RFC5036] Andersson, L., Menei, I., and Thomas, B., Editors, "LDP
Specification", RFC 5036, September 2007.
[TYPED-WC] Thomas, B., Asati, R., and Minei, I., "LDP Typed Wildcard
FEC", draft-ietf-mpls-ldp-typed-wildcard-07.txt, Work in
Progress, March 2010.
[RFC4447] L. Martini, Editor, E. Rosen, El-Aawar, T. Smith, G. Heron,
"Pseudowire Setup and Maintenance using the Label
Distribution Protocol", RFC 4447, April 2006.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC2119, March 1997.
7.2. Informative References
[MPLS_SEC] Fang, L. et al., "Security Framework for MPLS and GMPLS
Networks", draft-ietf-mpls-mpls-and-gmpls-security-framework-
05.txt, Work in Progress, March 2009.
Author's Address:
Syed Kamran Raza
Cisco Systems, Inc.,
2000 Innovation Drive,
Kanata, ON K2K-3E8, Canada.
E-mail: skraza@cisco.com
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