Network Working Group Internet Draft K. Kumaki, Ed. Category: standards track KDDI Corporation Created: October 23, 2009 T. Murai, Ed. Expires: April 23, 2010 FURUKAWA NETWORK SOLUTION CORP. T. Yamagata KDDI Corporation C. Sasaki KDDI R&D Labs Support for RSVP-TE in L3VPNs draft-kumaki-murai-ccamp-rsvp-te-l3vpn-01.txt Status of this Memo This Internet-Draft is submitted to IETF in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. 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." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. Abstract It is highly desirable for VPN customers to be able to establish their MPLS TE LSPs in the context of a BGP/MPLS IP-VPN. In such a scenario, it is necessary that RSVP control messages, such as Path messages and Resv messages, are appropriately handled by the PE routers. This document defines new object types in SESSION, SENDER_TEMPLATE and FILTERSPEC object to establish a customer MPLS TE LSP in the context of BGP/IP-VPNs and describes a procedure of RSVP control messages including the new object types. Conventions used in this document K.Kumaki, et al. [Page 1] draft-kumaki-murai-ccamp-rsvp-te-l3vpn-01 October 2009 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 [RFC2119]. Table of Contents 1. Introduction..................................................2 2. Problem Statement.............................................3 3. Terminology...................................................4 4. Protocol Extensions and Procedures............................4 4.1 Object Definitions........................................4 4.1.1 LSP_TUNNEL_VPN-IPv4 and LSP_TUNNEL_VPN-IPv6 SESSION Object ..............................................................4 4.1.2 LSP_TUNNEL_VPN-IPv4 and LSP_TUNNEL_VPN-IPv6 SENDER_TEMPLATE objects.......................................................6 4.1.3 LSP_TUNNEL_VPN-IPv4 and LSP_TUNNEL_VPN-IPv6 FILTER_SPEC objects.......................................................7 4.1.4 VPN-IPv4 and VPN-IPv6 RSVP_HOP objects..................7 4.2 Handling..................................................7 4.2.1 Path Message Processing at Ingress PE...................7 4.2.2 Path Message Processing at Egress PE....................8 4.2.3 Resv Processing at Egress PE............................9 4.2.4 Resv Processing at Ingress PE...........................9 5. Security Considerations.......................................9 6. IANA Considerations...........................................9 7. References...................................................10 7.1 Normative References.....................................10 7.2 Informative References...................................10 8. Acknowledgments..............................................10 9. Author's Addresses...........................................10 1. Introduction Service Providers have requirements to support CE-CE MPLS TE LSP establishments in the context of a BGP/MPLS IP-VPNs. [E2E-RSVP-TE] [RFC3209] defines extensions to RSVP for establishing label switched paths (LSPs) in MPLS networks. In order to establish a customer MPLS TE LSP over BGP/MPLS IP-VPNs, it is necessary that RSVP control messages, such as Path messages and Resv messages described in [RFC3209], are appropriately handled by the PE routers. [RSVP-L3VPN] defines new types of the existing objects (i.e. SESSION, SENDER_TEMPLATE, FILTERSPEC and RSVP_HOP) described in [RFC2205] to establish reservations for customer flows in the context of a BGP/MPLS IP-VPNs. Also, as described in section 7.4 of [RSVP-L3VPN], the same approach is used in this draft. This document defines new object types in SESSION, SENDER_TEMPLATE and FILTERSPEC object to establish a customer MPLS TE LSP in the context of BGP/IP-VPNs and describes a procedure of RSVP control K.Kumaki, et al. [Page 2] draft-kumaki-murai-ccamp-rsvp-te-l3vpn-01 October 2009 messages including new object types. The new object types are defined in section 4.1 and the specific procedure is described in section 4.2. 2. Problem Statement Customer MPLS TE LSPs in the context of BGP/MPLS IP-VPNs are shown in figure 1. Here, we make the following set of assumptions. 1. VPN1 and VPN2 are completely different customers. 2. CE1 and CE3 are head-end routers. 3. CE2 and CE4 are tail-end routers. 4. A same address (e.g., 192.0.2.1) is assigned at CE2 and CE4. <--------a customer MPLS TE LSP for VPN1--------> ....... ....... . --- . --- --- --- --- . --- . .|CE1|----|PE1|----|P1 |-----|P2 |----|PE2|-----|CE2|. . --- . --- --- --- --- . --- . ....... | | ....... (VPN1) | | (VPN1) | | ....... | | ....... . --- . | | . --- . .|CE3|------+ +-------|CE4|. . --- . . --- . ....... ....... (VPN2) (VPN2) <--------a customer MPLS TE LSP for VPN2--------> ^ ^ | | vrf instance vrf instance <-customer-> <---BGP/MPLS IP-VPN---> <-customer-> network network Figure 1 Customer MPLS TE LSPs in the context of BGP/MPLS IP-VPNs Consider that customers in VPN1 and VPN2 establish a customer MPLS TE LSP between their sites (i.e., between CE1 and CE2, between CE3 and CE4) In this case, CE1 and CE3 send a Path message to PE1 to establish customer MPLS TE LSPs between CE1 and CE2, CE3 and CE4, respectively. After receiving these messages, PE1 can identify each Path message (i.e., a message for VPN1 and a message for VPN2) from each incoming interface. Afterwards, PE1 forwards the messages to PE2 by routing information described in [RFC4364][RFC4659]. PE2, however, can not identify each Path message from current specification of K.Kumaki, et al. [Page 3] draft-kumaki-murai-ccamp-rsvp-te-l3vpn-01 October 2009 [RFC3209] (i.e., the message for VPN1 and the message for VPN2). Therefore, PE2 can not forward to appropriate CEs per VPN. Also, Resv messages per VPN can not be identified at PE1 due to the above reason. In order to distinguish between the VPN1 Path/Resv messages and the VPN2 Path/Resv messages, an identifier in Path/Resv messages is required. In this document, new object types in SESSION, SENDER_TEMPLATE and FILTERSPEC object as an identifier are defined to distinguish Path/Resv messages per VPN in the context of BGP/MPLS IP-VPNs. 3. Terminology LSP: Label Switched Path TE LSP: Traffic Engineering Label Switched Path MPLS TE LSP: Multi Protocol Label Switching TE LSP Customer MPLS TE LSP: an end-to-end MPLS TE LSP for customers CE: Customer Edge Equipment PE: Provider Edge: Provider Edge Equipment that has direct connections to CEs from the Layer3 point of view. 4. Protocol Extensions and Procedures 4.1 Object Definitions 4.1.1 LSP_TUNNEL_VPN-IPv4 and LSP_TUNNEL_VPN-IPv6 SESSION Object The LSP_TUNNEL_VPN-IPv4 (or VPN-IPv6) SESSION Object appears in RSVP messages that ordinarily contain a SESSION Object and are sent between ingress PE and egress PE in either direction. The object MUST NOT be included in any RSVP messages that are sent outside of the provider's backbone. The LSP_TUNNEL_VPN-IPv6 SESSION Object is analogous to the LSP_TUNNEL_VPN-IPv4 SESSION Object, using a VPN-IPv6 address ([RFC4659]) instead of a VPN-IPv4 address ([RFC4364]). The formats of the objects are as follows: Class = SESSION, LSP_TUNNEL_VPN-IPv4 C-Type = TBA K.Kumaki, et al. [Page 4] draft-kumaki-murai-ccamp-rsvp-te-l3vpn-01 October 2009 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | + + | VPN-IPv4 tunnel end point address (12 bytes) | + + | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | MUST be zero | Tunnel ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Extended Tunnel ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Class = SESSION, LSP_TUNNEL_VPN-IPv6 C-Type = TBA 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | + + | VPN-IPv6 tunnel end point address | + + | (24 bytes) | + + | | + + | | + + | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | MUST be zero | Tunnel ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | + + | Extended Tunnel ID | + + | (16 bytes) | + + | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ The VPN-IPv4 tunnel end point address (respectively VPN-IPv6 tunnel end point address) field contains an address of the VPN-IPv4 (respectively VPN-IPv6) address family encoded as specified in [RFC4364](respectively [RFC4659]). K.Kumaki, et al. [Page 5] draft-kumaki-murai-ccamp-rsvp-te-l3vpn-01 October 2009 The Tunnel ID and Extended Tunnel ID are identical to the same fields in the LSP_TUNNEL_IPv4 and LSP_TUNNEL_IPv6 SESSION objects ([RFC3209]). 4.1.2 LSP_TUNNEL_VPN-IPv4 and LSP_TUNNEL_VPN-IPv6 SENDER_TEMPLATE objects The LSP_TUNNEL_VPN-IPv4 (or VPN-IPv6) SENDER_TEMPLATE Object appears in RSVP messages that ordinarily contain a SENDER_TEMPLATE Object and are sent between ingress PE and egress PE in either direction (such as Path, PathError, and PathTear). The object MUST NOT be included in any RSVP messages that are sent outside of the provider's backbone. The format of the object is as follows: Class = SENDER_TEMPLATE, LSP_TUNNEL_VPN-IPv4 C-Type = TBA 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | + + | VPN-IPv4 tunnel sender address (12 bytes) | + + | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | MUST be zero | LSP ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Class = SENDER_TEMPLATE, LSP_TUNNEL_VPN-IPv6 C-Type = TBA 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | + + | VPN-IPv6 tunnel sender address | + + | (24 bytes) | + + | | + + | | + + | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | MUST be zero | LSP ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ K.Kumaki, et al. [Page 6] draft-kumaki-murai-ccamp-rsvp-te-l3vpn-01 October 2009 The VPN-IPv4 tunnel sender address (respectively VPN-IPv6 tunnel sender address) field contains an address of the VPN-IPv4 (respectively VPN-IPv6) address family encoded as specified in [RFC4364](respectively [RFC4659]). The LSP ID is identical to the LSP ID field in the LSP_TUNNEL_IPv4 and LSP_TUNNEL_IPv6 SENDER_TEMPLATE objects ([RFC3209]). 4.1.3 LSP_TUNNEL_VPN-IPv4 and LSP_TUNNEL_VPN-IPv6 FILTER_SPEC objects The LSP_TUNNEL_VPN-IPv4 (or VPN-IPv6) FILTER_SPEC Object appears in RSVP messages that ordinarily contain a FILTER_SPEC Object and are sent between ingress PE and egress PE in either direction (such as Resv, ResvError, and ResvTear). The object MUST NOT be included in any RSVP messages that are sent outside of the provider's backbone. Class = FILTER SPECIFICATION, LSP_TUNNEL_VPN-IPv4 C-Type = TBA The format of the LSP_TUNNEL_VPN-IPv4 FILTER_SPEC Object is identical to the LSP_TUNNEL_VPN-IPv4 SENDER_TEMPLATE Object. Class = FILTER SPECIFICATION, LSP_TUNNEL_VPN-IPv6 C-Type = TBA The format of the LSP_TUNNEL_VPN-IPv6 FILTER_SPEC Object is identical to the LSP_TUNNEL_VPN-IPv6 SENDER_TEMPLATE Object. 4.1.4 VPN-IPv4 and VPN-IPv6 RSVP_HOP objects The format of the VPN-IPv4 and VPN-IPv6 RSVP_HOP objects are identical to objects described in [RSVP-L3VPN]. 4.2 Handling It assumes that ingress PEs and egress PEs in the context of BGP/MPLS IP-VPNs have RSVP capabilities. 4.2.1 Path Message Processing at Ingress PE When a Path message arrives at the ingress PE (PE1 in Figure 1), the PE needs to establish suitable Path state and forward the Path message on to the egress PE (PE2 in Figure 1). In the following paragraphs we described the steps taken by the ingress PE. The Path message is addressed to the eventual destination (the receiver at the remote customer site) and carries the IP Router Alert option, in accordance with [RFC2205]. The ingress PE must recognize the router alert, intercept these messages and process them as RSVP signalling messages. K.Kumaki, et al. [Page 7] draft-kumaki-murai-ccamp-rsvp-te-l3vpn-01 October 2009 The details of operation at the ingress PE are as follows. When the ingress PE receives a Path message from CE that is addressed to the receiver, the VRF that is associated with the incoming interface is identified, just as for normal data path operations. The tunnel end point address of the receiver is looked up in the appropriate VRF, and the BGP Next-Hop for that tunnel end point address is identified. That next-hop is the egress PE. A new LSP_TUNNEL_VPN-IPv4/VPN-IPv6 SESSION Object is constructed, containing the Route Distinguisher (RD) that is part of the VPN-IPv4/VPN-IPv6 route prefix for this tunnel end point address, and the IPv4/IPv6 tunnel end point address from the original SESSION Object. In addition, a new LSP_TUNNEL_VPN- IPv4/IPv6 SENDER_TEMPLATE Object is constructed, with the original IPv4/IPv6 tunnel sender address from the incoming SENDER_TEMPLATE plus the RD that is used by this PE to advertise that prefix for this customer into the VPN. A new Path message will contain all the objects from the original Path message, replacing the original SESSION and SENDER_TEMPLATE objects with the new LSP_TUNNEL_VPN- IPv4/VPN-IPv6 type objects. The Path message is sent without IP Router Alert. 4.2.2 Path Message Processing at Egress PE When a Path message arrives at the egress PE (PE2 in Figure 1), it is addressed to the PE itself, and is handed to RSVP for processing. The router extracts the RD and IPv4/IPv6 address from the LSP_TUNNEL_VPN-IPv4/VPN-IPv6 SESSION Object, and determines the local VRF context by finding a matching VPN-IPv4 prefix with the specified RD that has been advertised by this router into BGP. The entire incoming RSVP message, including the VRF information, is stored as part of the Path state. Now the RSVP module can construct a Path message which differs from the Path it received in the following ways: a. Its tunnel end point address is the IP address extracted from the SESSION Object; b. The SESSION and SENDER_TEMPLATE objects are converted back to IPv4-type/IPv6-type by discarding the attached RD c. The RSVP_HOP Object contains the IP address of the outgoing interface of the egress PE and an LIH, as per normal RSVP processing. The router then sends the Path message on towards its tunnel end point address over the interface identified above. This Path message carries the IP Router-Alert option as required by [RFC2205]. K.Kumaki, et al. [Page 8] draft-kumaki-murai-ccamp-rsvp-te-l3vpn-01 October 2009 4.2.3 Resv Processing at Egress PE When a receiver at the customer site originates a Resv message for the session, normal RSVP procedures apply until the Resv, making its way back towards the sender, arrives at the "egress" PE (it is "egress" with respect to the direction of data flow, i.e. PE2 in figure 1). On arriving at PE2, the SESSION and FILTER_SPEC objects in the Resv, and the VRF in which the Resv was received, are used to find the matching Path state stored previously. The PE constructs a Resv message to send to the RSVP HOP stored in the Path state, i.e., the ingress PE (PE1 in Figure 1). The LSP TUNNEL IPv4/IPv6 SESSION Object is replaced with the same LSP_TUNNEL_VPN-IPv4/VPN-IPv6 SESSION Object received in the Path. The LSP TUNNEL IPv4/IPv6 FILTER_SPEC Object is replaced with a LSP_TUNNEL_VPN-IPv4/VPN-IPv6 FILTER_SPEC Object, which copies the VPN-IPv4/VPN-IPv6 address from the LSP TUNNEL SENDER_TEMPLATE received in the matching Path message. The Resv message MUST be addressed to the IP address contained within the RSVP_HOP Object in the Path message. 4.2.4 Resv Processing at Ingress PE Upon receiving a Resv message at the ingress PE (with respect to data flow, i.e. PE1 in Figure 1), the PE determines the local VRF context and associated Path state for this Resv by decoding the received SESSION and FILTER_SPEC objects. It is now possible to generate a Resv message to send to the appropriate CE. The Resv message sent to the ingress CE will contain LSP TUNNEL IPv4/IPv6 SESSION and LSP TUNNEL FILTER_SPEC objects, derived from the appropriate Path state. 5. Security Considerations This document defines RSVP-TE extensions for BGP/MPLS IP-VPNs. Hence the security of the RSVP-TE extensions relies on the security of RSVP-TE extensions for LSP tunnels. The security issues are described in the existing RSVP-TE extensions for LSP tunnels. [RFC3209] 6. IANA Considerations IANA will assign six new C-types under the existing Class. Class = SESSION, LSP_TUNNEL_VPN-IPv4 C-Type = TBA Class = SESSION, LSP_TUNNEL_VPN-IPv6 C-Type = TBA Class = SENDER_TEMPLATE, LSP_TUNNEL_VPN-IPv4 C-Type = TBA Class = SENDER_TEMPLATE, LSP_TUNNEL_VPN-IPv6 C-Type = TBA Class = FILTER SPECIFICATION, LSP_TUNNEL_VPN-IPv4 C-Type = TBA K.Kumaki, et al. [Page 9] draft-kumaki-murai-ccamp-rsvp-te-l3vpn-01 October 2009 Class = FILTER SPECIFICATION, LSP_TUNNEL_VPN-IPv6 C-Type = TBA 7. References 7.1 Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC3209] Awduche, D., Berger, L., Gan, D., Li, T., Srinivasan, V. and Swallow, G., "RSVP-TE: Extensions to RSVP for LSP Tunnels", RFC 3209, December 2001. 7.2 Informative References [E2E-RSVP-TE] Kumaki, K., Zhang, R. and Kamite, Y., "Requirements for supporting Customer RSVP and RSVP-TE over a BGP/MPLS IP-VPN", draft-ietf-l3vpn-e2e-rsvp-te-reqts (Work in Progress), July 2009. [RSVP-L3VPN] Davie, B., Faucheur, F. and Narayanan, A., "Support for RSVP in Layer 3 VPNs", draft-ietf-tsvwg-rsvp-l3vpn (Work in Progress), May 2009. [RFC2205] Braden, B., Zhang, L., Berson, S., Herzog, S., and Jamin, S., "Resource ReSerVation Protocol (RSVP) -- Version 1 Functional Specification", RFC 2205, September 1997. [RFC4364] Rosen, E. and Y. Rekhter, "BGP/MPLS IP Virtual Private Networks (VPNs)", RFC 4364, February 2006. [RFC4659] De Clercq, J., Ooms, D., Carugi, M., and F. Le Faucheur, "BGP-MPLS IP Virtual Private Network (VPN) Extension for IPv6 VPN", RFC 4659, September 2006. 8. Acknowledgments The author would like to express thanks to Makoto Nakamura for his helpful and useful comments and feedback. 9. Author's Addresses Kenji Kumaki (Editor) KDDI Corporation Garden Air Tower Iidabashi, Chiyoda-ku, Tokyo 102-8460, JAPAN Email: ke-kumaki@kddi.com K.Kumaki, et al. [Page 10] draft-kumaki-murai-ccamp-rsvp-te-l3vpn-01 October 2009 Tomoki Murai (Editor) FURUKAWA NETWORK SOLUTION CORP. 5-1-9, HIGASHI-YAWATA, HIRATSUKA Kanagawa 254-0016, JAPAN Email: murai@fnsc.co.jp Tomohiro Yamagata KDDI Corporation Garden Air Tower Iidabashi, Chiyoda-ku, Tokyo 102-8460, JAPAN Email: to-yamagata@kddi.com Chikara Sasaki KDDI R&D Laboratories, Inc. 2-1-15 Ohara Fujimino Saitama 356-8502, JAPAN Email: ch-sasaki@kddilabs.jp Intellectual Property Statement The IETF Trust takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in any IETF Document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. 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