Network Working Group X. Xu
Internet-Draft Huawei
Intended status: Standards Track R. Raszuk
Expires: September 4, 2015 Mirantis Inc.
U. Chunduri
Ericsson
L. Contreras
Telefonica I+D
March 3, 2015

Advertising Encapsulation Capability Using OSPF
draft-xu-ospf-encapsulation-cap-01

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 OSPF. Note that this encapsulation capability advertisment may be applicable to other use cases as well.

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 September 4, 2015.

Copyright Notice

Copyright (c) 2015 IETF Trust and the persons identified as the document authors. All rights reserved.

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

[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 OSPF. Here the OSPF means both OSPFv2 and OSPFv3. Note that this encapsulation capability advertisment may be applicable to other use cases as well.

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 [RFC4970] and [I-D.xu-spring-islands-connection-over-ip].

3. Advertising Encapsulation Capability

MPLS-SPRING-enabled routers need to advertise the encapsulation type(s) they support by using a new TLV of the OSPF Router Information (RI) Opaque LSA [RFC4970], referred to as Encapsulation Capability TLV. This TLV is applicable to both OSPFv2 and OSPFv3. The Encapsulation Capability TLV SHOULD NOT appear more than once wihin a given OSPF Router Information (RI) Opaque LSA. 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 Capability TLV is TBD, the Length value is variable, 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 tunnel [RFC4023] : Type code=TBD1; Length=0
  2. MPLS-in-GRE tunnel [RFC4023]: Type code=TBD2; Length=0
  3. MPLS-in-L2TPv3 tunnel [RFC4817]: Type code=TBD3; Length=0
  4. MPLS-in-UDP tunnel [I-D.ietf-mpls-in-udp]: Type code=TBD4; Length=0
  5. MPLS-in-IP tunnel with IPsec Transport Mode [RFC5566]: Type code=TBD5; Length=0

4. Acknowledgements

The authors would like to thank Carlos Pignataro and Karsten Thomann for their valuable comments on this draft.

5. IANA Considerations

This memo includes a request to IANA for allocating the type codes for Encapsulation Capability 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., Raszuk, R., Chunduri, U. and L. Contreras, "Connecting MPLS-SPRING Islands over IP Networks", Internet-Draft draft-xu-spring-islands-connection-over-ip-04, March 2015.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC4970] Lindem, A., Shen, N., Vasseur, JP., Aggarwal, R. and S. Shaffer, "Extensions to OSPF for Advertising Optional Router Capabilities", RFC 4970, July 2007.

7.2. Informative References

[I-D.ietf-mpls-in-udp] Xu, X., Sheth, N., Yong, L., Callon, R. and D. Black, "Encapsulating MPLS in UDP", Internet-Draft draft-ietf-mpls-in-udp-11, January 2015.
[RFC4023] Worster, T., Rekhter, Y. and E. Rosen, "Encapsulating MPLS in IP or Generic Routing Encapsulation (GRE)", RFC 4023, March 2005.
[RFC4817] Townsley, M., Pignataro, C., Wainner, S., Seely, T. and J. Young, "Encapsulation of MPLS over Layer 2 Tunneling Protocol Version 3", RFC 4817, March 2007.
[RFC5566] Berger, L., White, R. and E. Rosen, "BGP IPsec Tunnel Encapsulation Attribute", RFC 5566, June 2009.

Authors' Addresses

Xiaohu Xu Huawei EMail: xuxiaohu@huawei.com
Robert Raszuk Mirantis Inc. EMail: robert@raszuk.net
Uma Chunduri Ericsson EMail: uma.chunduri@ericsson.com
Luis M. Contreras Telefonica I+D Ronda de la Comunicacion, s/n Sur-3 building, 3rd floor Madrid,, 28050 Spain EMail: luismiguel.contrerasmurillo@telefonica.com URI: http://people.tid.es/LuisM.Contreras/