Network Working Group X. Xu Internet-Draft Huawei Intended status: Standards Track R. Raszuk Expires: February 13, 2015 Individual U. Chunduri Ericsson V. Lopezalvarez Telefonica August 12, 2014 Advertising Encapsulation Capability Using IS-IS draft-xu-isis-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 IS-IS. Note that this encapsulation capablity advertisment could be applicalbe to other use cases besides that as mentioned above 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 February 13, 2015. Xu, et al. Expires February 13, 2015 [Page 1] Internet-DrafAdvertising Encapsulation Capability Using IS-I August 2014 Copyright Notice Copyright (c) 2014 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 . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Requirements Language . . . . . . . . . . . . . . . . . . 2 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. Advertising Encapsulation Capability . . . . . . . . . . . . 3 4. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 3 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3 6. Security Considerations . . . . . . . . . . . . . . . . . . . 4 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 4 7.1. Normative References . . . . . . . . . . . . . . . . . . 4 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. Note that this encapsulation capablity advertisment could be applicalbe to other use cases besides that as mentioned above 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]. Xu, et al. Expires February 13, 2015 [Page 2] Internet-DrafAdvertising Encapsulation Capability Using IS-I August 2014 2. Terminology This memo makes use of the terms defined in [RFC4971] 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 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 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 for his valuable comments on this draft. 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. Xu, et al. Expires February 13, 2015 [Page 3] Internet-DrafAdvertising Encapsulation Capability Using IS-I August 2014 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., Sivabalan, S., Raszuk, R., Chunduri, U., and V. Lopezalvarez, "Connecting MPLS-SPRING Islands over IP Networks", draft-xu-spring-islands-connection-over-ip-01 (work in progress), 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. [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 Xu, et al. Expires February 13, 2015 [Page 4] Internet-DrafAdvertising Encapsulation Capability Using IS-I August 2014 Robert Raszuk Individual Email: robert@raszuk.net Uma Chunduri Ericsson Email: uma.chunduri@ericsson.com Victor Lopezalvarez Telefonica Email: victor.lopezalvarez@telefonica.com Xu, et al. Expires February 13, 2015 [Page 5]