RFC 3475 (rfc3475) - Page 2 of 13

Documentation of IANA assignments for Constraint-Based LSP setup using LDP (CR-LDP) Extensions for Automatic Switched Optical Network (ASON)

RFC 3475               CR-LDP Extensions for ASON             March 2003


      4.3 Crankback TLV .............................................  9
   5.  Additional Error Codes ....................................... 10
   6.  IANA Consideration ........................................... 11
   9.  Security Considerations ...................................... 11
   10. Normative References ......................................... 11
   11. Intellectual Property ........................................ 12
   12. Author's Address ............................................. 12
   13. Full Copyright Statement ..................................... 13

1. Introduction

   Automatic Switched Optical Network (ASON) is an architecture,
   specified by ITU-T Study Group 15 (SG15), for the introduction of a
   control plane for optical networks.  The development and the
   standardization of ASON has been done by ITU-T SG15 and is documented
   in recommendation G.8080 [1].  The architecture includes a control
   plane with a set of reference points between the architectural
   components.  The ASON signaling that runs over interfaces defined in
   those reference points are described in ITU-T recommendation G.7713
   [2].

   Constraint-Based LSP Setup using LDP (CR-LDP) [3] is one of the
   protocols selected by the ITU for the realization of G.7713 and its
   dynamic connection management. The work specific to CR-LDP extensions
   for ASON is documented in ITU-T recommendation G.7713.3 [8].

   This document introduces those CR-LDP extensions that are specific to
   ASON and requests IANA allocation of code points for these
   extensions.  The document does not specify how these extensions are
   used; that is the subject of the above mentioned ITU-T documents.
   This document should be considered in conjunction with RFC 3036 [4],
   RFC 3212 [3], and CR-LDP extensions for GMPLS [5].

2. Overview of CR-LDP Extensions for ASON

   This document describes ASON specific CR-LDP extensions covering the
   following ASON signaling requirements:

   - Call and connection control separation
   - Support of Soft Permanent Connections (SPC)
   - Crankback
   - Additional error codes

   An important ASON architectural principle is the separation between
   the call and the connection controllers as described in G.8080.  Call
   and connection control separation allows for a call with multiple
   connections associated with it.  It also allows for a call with no




Aboul-Magd                   Informational