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. Xu, et al. Expires February 5, 2015 [Page 1] Internet-DrafAdvertising Encapsulation Capability Using IS-I August 2014 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]. Xu, et al. Expires February 5, 2015 [Page 2] Internet-DrafAdvertising Encapsulation Capability Using IS-I August 2014 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. Xu, et al. Expires February 5, 2015 [Page 3] Internet-DrafAdvertising Encapsulation Capability Using IS-I August 2014 [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 Xu, et al. Expires February 5, 2015 [Page 4] Internet-DrafAdvertising Encapsulation Capability Using IS-I August 2014 Victor Lopezalvarez Telefonica Email: victor.lopezalvarez@telefonica.com Xu, et al. Expires February 5, 2015 [Page 5]