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Versions: 00 01 02 03 04 05 06 07 draft-ietf-isis-encapsulation-cap

Network Working Group                                              X. Xu
Internet-Draft                                                    Huawei
Intended status: Standards Track                            S. Sivabalan
Expires: February 5, 2015                                          Cisco
                                                               R. Raszuk
                                                              Individual
                                                             U. Chunduri
                                                                Ericsson
                                                         V. Lopezalvarez
                                                              Telefonica
                                                          August 4, 2014


            Advertising Encapsulation Capability Using IS-IS
                   draft-xu-isis-encapsulation-cap-00

Abstract

   In a particular network environment where MPLS-SPRING-enabled routers
   are partially deployed, it needs to transport MPLS traffic through an
   IP-based tunnel between two MPLS-SPRING-enabled routers so as to
   traverse non-MPLS routers.  The ingress of the IP-based tunnel must
   know which encapsulation type is supported by the egress of that IP-
   based tunnel.This document describes how to advertise the
   encapsulation capability of MPLS-SPRING-enabled routers using IS-IS.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on February 5, 2015.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.




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   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Advertising Encapsulation Capability  . . . . . . . . . . . .   3
   4.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   3
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   3
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   4
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   [I-D.xu-spring-islands-connection-over-ip] describes a particular
   network environment where MPLS-SPRING-enabled routers are partially
   deployed and therefore it needs to transport MPLS traffic through an
   IP-based tunnel between two MPLS-SPRING-enabled routers so as to
   traverse non-MPLS routers.  The ingress of the IP-based tunnel (i.e.,
   tunnel encapsulator) must know which encapsulation type is supported
   by the egress of the IP-based tunnel (i.e., tunnel decapsulator).This
   document describes how to advertise the encapsulation capability of
   MPLS-SPRING-enabled routers using IS-IS.

1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

2.  Terminology

   This memo makes use of the terms defined in [RFC4971] and
   [I-D.xu-spring-islands-connection-over-ip].





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3.  Advertising Encapsulation Capability

   MPLS-SPRING-enabled routers need to advertise the encapsulation
   type(s) they support by using a new sub-TLV of the IS-IS Router
   CAPABILITY TLV [RFC4971], referred to as Encapsulation Capability
   sub-TLV.  The Encapsulation Capability sub-TLV could not appear more
   than once wihin a given IS-IS Router CAPABILITY TLV.  The scope of
   the advertisement depends on the application but it is recommended
   that it SHOULD be domain-wide.  The Type code of the Encapsualtion
   Cability sub-TLV is TBD, the Length value is vairalbe, and the Value
   field contains one or more Encapsulation Type sub-TLVs with each
   indicating a particular encapsulation format that the advertising
   router supports.

   This document defines the following types of Encapsulation Type sub-
   TLV:

   1.  MPLS-in-IP [RFC4023] : Type code=TBD1; Length=0

   2.  MPLS-in-GRE [RFC4023]: Type code=TBD2; Length=0

   3.  MPLS-in-L2TPv3 [RFC3931]: Type code=TBD3; Length=0

   4.  MPLS-in-UDP [I-D.ietf-mpls-in-udp]: Type code=TBD4; Length=0

4.  Acknowledgements

   TBD.

5.  IANA Considerations

   This memo includes a request to IANA for allocating the type codes
   for Encapsulation Capability sub-TLV and Encapsulation Type sub-TLVs.

6.  Security Considerations

   This document does not introduce any new security risk.

7.  References

7.1.  Normative References

   [I-D.xu-spring-islands-connection-over-ip]
              Xu, X. and S. Sivabalan, "Connecting SPRING Islands over
              IP Networks", draft-xu-spring-islands-connection-over-
              ip-00 (work in progress), February 2014.





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   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC4971]  Vasseur, JP., Shen, N., and R. Aggarwal, "Intermediate
              System to Intermediate System (IS-IS) Extensions for
              Advertising Router Information", RFC 4971, July 2007.

7.2.  Informative References

   [I-D.ietf-mpls-in-udp]
              Xu, X., Sheth, N., Yong, L., Pignataro, C., and F.
              Yongbing, "Encapsulating MPLS in UDP", draft-ietf-mpls-in-
              udp-05 (work in progress), January 2014.

   [RFC3931]  Lau, J., Townsley, M., and I. Goyret, "Layer Two Tunneling
              Protocol - Version 3 (L2TPv3)", RFC 3931, March 2005.

   [RFC4023]  Worster, T., Rekhter, Y., and E. Rosen, "Encapsulating
              MPLS in IP or Generic Routing Encapsulation (GRE)", RFC
              4023, March 2005.

Authors' Addresses

   Xiaohu Xu
   Huawei

   Email: xuxiaohu@huawei.com


   Siva Sivabalan
   Cisco

   Email: msiva@cisco.com


   Robert Raszuk
   Individual

   Email: robert@raszuk.net


   Uma Chunduri
   Ericsson

   Email: uma.chunduri@ericsson.com






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   Victor Lopezalvarez
   Telefonica

   Email: victor.lopezalvarez@telefonica.com















































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