draft-ietf-mpls-ldp-applic-01.txt   draft-ietf-mpls-ldp-applic-02.txt 
Network Working Group Bob Thomas Network Working Group Bob Thomas
Internet Draft Cisco Systems, Inc. Internet Draft Cisco Systems, Inc.
Expiration Date: December 2000 Expiration Date: February 2001
Eric Gray Eric Gray
Zaffire, Inc. Zaffire, Inc.
June 2000 August 2000
LDP Applicability LDP Applicability
draft-ietf-mpls-ldp-applic-01.txt draft-ietf-mpls-ldp-applic-02.txt
Status of this Memo Status of this Memo
This document is an Internet-Draft and is in full conformance with This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026. all provisions of Section 10 of RFC2026.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet- other groups may also distribute working documents as Internet-
Drafts. Drafts.
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The list of current Internet-Drafts can be accessed at The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt http://www.ietf.org/ietf/1id-abstracts.txt
The list of Internet-Draft Shadow Directories can be accessed at The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html. http://www.ietf.org/shadow.html.
Abstract Abstract
Multiprotocol Label Switching (MPLS) is a method for forwarding Multiprotocol Label Switching (MPLS) is a method for forwarding
packets that uses short, fixed-length values carried by packets, packets that uses short, fixed-length values carried by packets,
called labels, to determine packet nexthops ([MPLS-FRAMEWORK], called labels, to determine packet nexthops [MPLS-ARCH]). A
[MPLS-ARCH]). A fundamental concept in MPLS is that two Label fundamental concept in MPLS is that two Label Switching Routers
Switching Routers (LSRs) must agree on the meaning of the labels used (LSRs) must agree on the meaning of the labels used to forward
to forward traffic between and through them. This common traffic between and through them. This common understanding is
understanding is achieved by using a set of procedures, called a achieved by using a set of procedures, called a label distribution
label distribution protocol, by which one LSR informs another of protocol, by which one LSR informs another of label bindings it has
label bindings it has made. This document describes the made. This document describes the applicability of a set of such
applicability of a set of such procedures called LDP (for Label procedures called LDP (for Label Distribution Protocol) [LDP] by
Distribution Protocol) [LDP] by which LSRs distribute labels to which LSRs distribute labels to support MPLS forwarding along
support MPLS forwarding along normally routed paths. normally routed paths.
1. LDP Applicability 1. LDP Applicability
A label distribution protocol is a set of procedures by which one A label distribution protocol is a set of procedures by which one
Label Switching Router (LSR) informs another of the meaning of labels Label Switching Router (LSR) informs another of the meaning of labels
used to forward traffic between and through them. used to forward traffic between and through them.
The MPLS architecture allows for the possibility of more than a The MPLS architecture allows for the possibility of more than a
single method for distributing labels, and a number of different single method for distributing labels, and a number of different
label distribution protocols are being standardized. Existing label distribution protocols are being standardized. Existing
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5. Security Considerations 5. Security Considerations
LDP defines the optional use of the TCP MD5 Signature Option to LDP defines the optional use of the TCP MD5 Signature Option to
protect against the introduction of spoofed TCP segments into LDP protect against the introduction of spoofed TCP segments into LDP
session connection streams. LDP use of the TCP MD5 Signature Option session connection streams. LDP use of the TCP MD5 Signature Option
is similar to BGP [RFC1771] use of the option specified in [RFC2385]. is similar to BGP [RFC1771] use of the option specified in [RFC2385].
6. References 6. References
CRLDP-AS] J. Ash, M. Girish, E. Gray, B. Jamoussi, G. Wright, [CRLDP-AS] J. Ash, M. Girish, E. Gray, B. Jamoussi, G. Wright,
"Applicability Statement for CR-LDP", Work in Progress, September "Applicability Statement for CR-LDP", Work in Progress, September
1999. 1999.
[LDP] L. Andersson, P. Doolan, N. Feldman, A. Fredette, B. Thomas, [LDP] L. Andersson, P. Doolan, N. Feldman, A. Fredette, B. Thomas,
"LDP Specification", Work in Progress, June 2000. "LDP Specification", Work in Progress, June 2000.
[MPLS-ARCH] E. Rosen, A. Viswanathan, R. Callon, "Multiprotocol Label [MPLS-ARCH] E. Rosen, A. Viswanathan, R. Callon, "Multiprotocol Label
Switching Architecture", Work in Progress, August 1999. Switching Architecture", Work in Progress, August 1999.
[MPLS-FRAMEWORK] R. Callon, P. Doolan, N. Feldman, A. Fredette, G.
Swallow, A. Viswanathan, "A Framework for Multiprotocol Label
Switching", Work in Progress, September 1999.
[RFC1771] Y. Rekhter, T. Li, "A Border Gateway Protocol 4 (BGP-4)", [RFC1771] Y. Rekhter, T. Li, "A Border Gateway Protocol 4 (BGP-4)",
RFC 1771, March 1995. RFC 1771, March 1995.
[RFC2026] S. Bradner, "The Internet Standards Process -- Revision 3", [RFC2026] S. Bradner, "The Internet Standards Process -- Revision 3",
RFC 2026, October 1996. RFC 2026, October 1996.
[RFC2385] A. Heffernan, "Protection of BGP Sessions via the TCP MD5 [RFC2385] A. Heffernan, "Protection of BGP Sessions via the TCP MD5
Signature Option", RFC 2385, August 1998. Signature Option", RFC 2385, August 1998.
[RFC2547] E. Rosen, Y. Rekhter, "BGP/MPLS VPNs", RFC 2547, March [RFC2547] E. Rosen, Y. Rekhter, "BGP/MPLS VPNs", RFC 2547, March
 End of changes. 

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