Label Advertisement Discipline for LDP FECs

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Document Type Active Internet-Draft (mpls WG)
Last updated 2014-03-09 (latest revision 2014-01-20)
Replaces draft-raza-mpls-ldp-applicability-label-adv
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MPLS Working Group                                          Kamran Raza
Internet Draft                                             Sami Boutros 
Updates: 5036, 4447, 5918, 6388, 3212                      Luca Martini 
Intended status: Standards Track                    Cisco Systems, Inc. 
Expires: July 19, 2014                                             
                                                        Nicolai Leymann
                                                       Deutsche Telekom
                                                       January 20, 2014 

                Label Advertisement Discipline for LDP FECs 

  The label advertising behavior of an LDP speaker for a given FEC is 
  governed by the FEC type and not necessarily by the LDP session's 
  negotiated label advertisement mode. This document updates RFC 5036 
  to make that fact clear, as well as updates RFC 3212, RFC 4447, 
  RFC 5918, and RFC 6388 by specifying the label advertisement mode 
  for all currently defined FECs. 
 Status of this Memo 

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Internet-Draft   Label Advertisement Discipline for LDP FECs   Jan 2014 
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Table of Contents 

  1. Introduction                                                     2 
  2. Label Advertisement Discipline                                   3 
     2.1. Update to RFC-5036                                          3 
     2.2. Specification for LDP FECs                                  4 
  3. Security Considerations                                          4 
  4. IANA Considerations                                              4 
  5. References                                                       5 
     5.1. Normative References                                        5 
     5.2. Informative References                                      5 
  6. Acknowledgments                                                  5 

1. Introduction 

  Label Distribution Protocol (LDP) [RFC5036] allows label 
  advertisement mode negotiation at the time of session establishment. 
  LDP specification also dictates that only single label advertisement 
  mode is negotiated, agreed and used for a given LDP session between 
  two LSRs. 
  The negotiated label advertisement mode defined in RFC 5036 and 
  carried in the LDP Initialization message is only indicative. It 
  indicates how the LDP speakers on a session will advertise labels for 
  some FECs, but it is not a rule that restricts the speakers to behave 
  in a specific way.  Furthermore, for some FEC types the advertising 
  behavior of the LDP speaker is governed by the FEC type and not by 

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Internet-Draft   Label Advertisement Discipline for LDP FECs   Jan 2014 
  the negotiated behavior. 
  This document updates [RFC5036] to make that fact clear, and updates 
  [RFC3212], [RFC4447], [RFC5036], [RFC5918], and [RFC6388] to indicate
  for each FEC type that has already been defined whether the label 
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