BESS Workgroup A. Sajassi (Editor) INTERNET-DRAFT S. Salam Intended Status: Standard Track Cisco N. Del Regno Verizon J. Rabadan Nokia Expires: October 25, 2018 April 25, 2018 (PBB-)EVPN Seamless Integration with (PBB-)VPLS draft-ietf-bess-evpn-vpls-seamless-integ-04 Abstract This draft specifies procedures for backward compatibility of the (PBB-)EVPN solution with (PBB-)VPLS and provides mechanisms for seamless integration of the two technologies in the same MPLS/IP network on a per-VPN-instance basis. Implementation of this draft enables service providers to introduce (PBB-)EVPN PEs in their brown- field deployments of (PBB-)VPLS networks. 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/1id-abstracts.html The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html Copyright and License Notice Sajassi et al. Expires October 25, 2018 [Page 1] INTERNET DRAFT draft-ietf-bess-evpn-vpls-seamless-integ April 25, 2018 Copyright (c) 2018 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 . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1. Specification of Requirements . . . . . . . . . . . . . . 4 1.2. Terms and Abbreviations . . . . . . . . . . . . . . . . . 4 2. Requirements . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 VPLS Integration with EVPN . . . . . . . . . . . . . . . . . . . 6 3.1 Capability Discovery . . . . . . . . . . . . . . . . . . . . 7 3.2 Forwarding Setup and Unicast Operation . . . . . . . . . . . 7 3.3 MAC Mobility . . . . . . . . . . . . . . . . . . . . . . . . 8 3.4 Multicast Operation . . . . . . . . . . . . . . . . . . . . 9 3.4.1 Ingress Replication . . . . . . . . . . . . . . . . . . 9 3.4.2 P2MP Tunnel . . . . . . . . . . . . . . . . . . . . . . 10 4 PBB-VPLS Integration with PBB-EVPN . . . . . . . . . . . . . . . 10 4.1 Capability Discovery . . . . . . . . . . . . . . . . . . . . 10 4.2 Forwarding Setup and Unicast Operation . . . . . . . . . . . 10 4.3 MAC Mobility . . . . . . . . . . . . . . . . . . . . . . . . 11 4.4 Multicast Operation . . . . . . . . . . . . . . . . . . . . 11 4.4.1 Ingress Replication . . . . . . . . . . . . . . . . . . 11 4.4.2 P2MP Tunnel - Inclusive Tree . . . . . . . . . . . . . . 12 5 Security Considerations . . . . . . . . . . . . . . . . . . . . 12 6 IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 12 7 References . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.1 Normative References . . . . . . . . . . . . . . . . . . . 12 7.2 Informative References . . . . . . . . . . . . . . . . . . 13 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 13 Sajassi et al. Expires October 25, 2018 [Page 2] INTERNET DRAFT draft-ietf-bess-evpn-vpls-seamless-integ April 25, 2018 1 Introduction Virtual Private LAN Service (VPLS) and Provider Backbone Bridging VPLS (PBB-VPLS) are widely-deployed Layer-2 VPN (L2VPN) technologies. Many Service Providers (SPs) who are looking at adopting Ethernet VPN (EVPN) and Provider Backbone Bridging EVPN (PBB-EVPN) want to preserve their investment in the VPLS and PBB-VPLS networks. Hence, they require procedures by which EVPN and PBB-EVPN technology can be introduced into their brown-field VPLS and PBB-VPLS networks without requiring any upgrades (software or hardware) to these networks. This document specifies procedures for the seamless integration of the two technologies in the same MPLS/IP network. Throughout this document, we use the term (PBB-)EVPN to correspond to both EVPN and PBB-EVPN and we use the term (PBB-)VPLS to correspond to both VPLS and PBB- VPLS. VPLS PE +---+ |PE1| +---+ / EVPN/VPLS PE +---------------+ EVPN/VPLS PE +---+ | | +---+ |PE4|----| MPLS/IP |---|PE5| +---+ | Core | +---+ | | +---------------+ / \ +---+ +---+ |PE2| |PE3| +---+ +---+ VPLS PE VPLS PE Figure 1: Seamless Integration of (PBB-)EVPN PEs & (PBB-)VPLS Section 2 provides the details of the requirements. Section 3 specifies procedures for the seamless integration of VPLS and EVPN networks. And section 4 specifies procedures for the seamless integration of PBB-VPLS and PBB-EVPN networks. It should be noted that the scenarios for PBB-VPLS integration with EVPN and VPLS integration with PBB-EVPN are not covered in this document because there haven't been any requirements from service providers for these scenarios. The reason for that is that deployments which employ PBB-VPLS typically require PBB encapsulation for various reasons. Hence, it is expected that for those deployments the evolution path would be from PBB-VPLS towards PBB-EVPN. Furthermore, the evolution path from VPLS is expected to be towards Sajassi et al. Expires October 25, 2018 [Page 3] INTERNET DRAFT draft-ietf-bess-evpn-vpls-seamless-integ April 25, 2018 EVPN. The seamless integration solution described in this document has the following attributes: - When ingress replication is used for multi-destination traffic delivery, the solution reduces the scope of [MMRP] (which is a soft- state protocol) to only that of existing VPLS PEs, and uses the more robust BGP-based mechanism for multicast pruning among new EVPN PEs. - It is completely backward compatible. - New PEs can leverage the extensive multi-homing mechanisms and provisioning simplifications of (PBB-)EVPN: a. Auto-sensing of MHN / MHD b. Auto-discovery of redundancy group c. Auto-provisioning in DF election and VLAN carving 1.1. Specification of Requirements The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here. 1.2. Terms and Abbreviations B-MAC: Backbone MAC B-VID: Backbone VLAN ID Broadcast Domain: In a bridged network, the broadcast domain corresponds to a Virtual LAN (VLAN), where a VLAN is typically represented by a single VLAN ID (VID) but can be represented by several VIDs where Shared VLAN Learning (SVL) is used per [IEEE.802.1ah]. Bridge Table: An instantiation of a broadcast domain on a MAC-VRF RIB: Routing Information Base - An instantiation of a routing table on a MAC-VRF FIB: Forwarding Information Base - An instantiation of a forwarding table on a MAC-VRF CE: A Customer Edge device, e.g., a host, router, or switch. Sajassi et al. Expires October 25, 2018 [Page 4] INTERNET DRAFT draft-ietf-bess-evpn-vpls-seamless-integ April 25, 2018 EVI: An EVPN Instance spanning the Provider Edge (PE) devices participating in that EVPN. MAC-VRF: A Virtual Routing and Forwarding table for Media Access Control (MAC) addresses on an EVPN PE. MAC address: Media Access Control address ES: When a customer site (device or network) is connected to one or more PEs via a set of Ethernet links, then that set of links is referred to as an "Ethernet Segment". ESI: An Ethernet Segment Identifier is a unique non-zero identifier that identifies an ES Ethernet Tag: An Ethernet Tag identifies a particular broadcast domain, e.g., a VLAN. An EVPN instance consists of one or more broadcast domains MHD: Multi-Homed Device MHN: Multi-Homed Network P2MP: Point-to-Multipoint PBB: Provider Backbone Bridge PE: Provider Edge device VSI: Virtual Switch Instance VPLS: Virtual Private LAN Service Single-Active Redundancy Mode: When only a single PE, among all the PEs attached to an Ethernet segment, is allowed to forward traffic to/from that Ethernet segment for a given VLAN, then the Ethernet segment is defined to be operating in Single-Active redundancy mode. All-Active Redundancy Mode: When all PEs attached to an Ethernet segment are allowed to forward known unicast traffic to/from that Ethernet segment for a given VLAN, then the Ethernet segment is defined to be operating in All-Active redundancy mode. (PBB-)EVPN: refers to both, PBB-EVPN and EVPN. This document uses this abbreviation when a given description applies to both technologies. (PBB-)VPLS: refers to both, PBB-VPLS and VPLS. As for EVPN, this Sajassi et al. Expires October 25, 2018 [Page 5] INTERNET DRAFT draft-ietf-bess-evpn-vpls-seamless-integ April 25, 2018 abbreviation is used when the text applies to both technologies. VPLS A-D: refers to Virtual Private LAN Services with BGP-based Auto Discovery as in [RFC6074]. PW: Pseudowire. 2. Requirements Following are the key requirements for backward compatibility between (PBB-)EVPN and (PBB-)VPLS: 1. The solution MUST allow for staged migration towards (PBB-)EVPN on a site-by-site basis per VPN instance - e.g., new EVPN sites to be provisioned on (PBB-)EVPN Provider Edge devices (PEs). 2. The solution MUST require no changes to existing VPLS or PBB-VPLS PEs, not even a software upgrade. 3. The solution MUST allow for the coexistence of PEs running (PBB- )EVPN and (PBB-)VPLS for the same VPN instance and single-homed segments. 4. The solution MUST support single-active redundancy of multi-homed networks and multi-homed devices for (PBB-)EVPN PEs. 5. In case of single-active redundancy, the participant VPN instances MAY span across both (PBB-)EVPN PEs and (PBB-)VPLS PEs as long as the MHD or MHN is connected to (PBB-)EVPN PEs. In case of an ES link failure, the (PBB-)EVPN PEs will send a BGP mass-withdraw to the EVPN peers OR MAC advertisement with MAC Mobility extended community for PBB-EVPN AND follow existing VPLS MAC Flush procedures with the VPLS peers. 6. The support of All-Active redundancy mode across both (PBB-)EVPN PEs and (PBB-)VPLS PEs is outside the scope of this document. These requirements collectively allow for the seamless insertion of the (PBB-)EVPN technology into brown-field (PBB-)VPLS deployments. 3 VPLS Integration with EVPN In order to support seamless integration with VPLS PEs, this document requires that VPLS PEs support VPLS A-D per [RFC6074] and EVPN PEs support both BGP EVPN routes per [RFC7432] and VPLS A-D per Sajassi et al. Expires October 25, 2018 [Page 6] INTERNET DRAFT draft-ietf-bess-evpn-vpls-seamless-integ April 25, 2018 [RFC6074]. All the logic for seamless integration SHALL reside on the EVPN PEs. If a VPLS instance is setup without the use of VPLS A-D, it is still possible (but cumbersome) for EVPN PEs to integrate into that VPLS instance by manually configuring Pseudowires (PWs) to all the VPLS PEs in that instance (i.e., the integration is no longer seamless). 3.1 Capability Discovery The EVPN PEs MUST advertise both the BGP VPLS Auto-Discovery (A-D) route as well as the BGP EVPN Inclusive Multicast Ethernet Tag (IMET) route for a given VPN instance. The VPLS PEs only advertise the BGP VPLS A-D route, per the procedures specified in [RFC4761], [RFC4762] and [RFC6074]. The operator may decide to use the same Route Target (RT) to identify a VPN on both EVPN and VPLS networks. In this case, when a VPLS PE receives the EVPN IMET route, it MUST ignore it on the basis that it belongs to an unknown SAFI. However, the operator may choose to use two RTs - one to identify the VPN on VPLS network and another for EVPN network and employ RT-constrained [RFC4684] in order to prevent BGP EVPN routes from reaching the VPLS PEs. When an EVPN PE receives both a VPLS A-D route as well as an EVPN IMET route from a given remote PE for the same VPN instance, it MUST give preference to the EVPN route for the purpose of discovery. This ensures that, at the end of the route exchanges, all EVPN capable PEs discover other EVPN capable PEs in addition to the VPLS-only PEs for that VPN instance. Furthermore, all the VPLS-only PEs will discover the EVPN PEs as if they were standard VPLS PEs. In other words, when the discovery phase is complete, the EVPN PEs will have discovered all the PEs in the VPN instance along with their associated capability (EVPN or VPLS-only), whereas the VPLS PEs will have discovered all the PEs in the VPN instance as if they were all VPLS- only PEs. 3.2 Forwarding Setup and Unicast Operation The procedures for forwarding state setup and unicast operation on the VPLS PE are per [RFC8077], [RFC4761], [RFC4762]. The procedures for forwarding state setup and unicast operation on the EVPN PE are as follows: - The EVPN PE MUST establish a PW to a remote PE from which it has received only a VPLS A-D route for the corresponding VPN instance, and MUST set up the label stack corresponding to the PW FEC. For seamless integration between EVPN and VPLS PEs, the PW that is setup between a pair of VPLS and EVPN PEs is between the VSI of the VPLS PE Sajassi et al. Expires October 25, 2018 [Page 7] INTERNET DRAFT draft-ietf-bess-evpn-vpls-seamless-integ April 25, 2018 and the MAC-VRF of the EVPN PE. - The EVPN PE must set up the label stack corresponding to the MP2P VPN unicast FEC to any remote PE that has advertised EVPN IMET route. - If an EVPN PE receives a VPLS A-D route followed by an EVPN IMET route from the same PE and a PW is already setup to that PE, then the EVPN MUST bring that PW operationally down. - If an EVPN PE receives an EVPN IMET route followed by a VPLS A-D route from the same PE, then the EVPN PE will setup the PW but MUST keep it operationally down. - In case VPLS AD is not used in some VPLS PEs, the EVPN PEs need to be provisioned manually with PWs to those remote VPLS PEs for each VPN instance. In that case, if an EVPN PE receives an EVPN IMET route from a PE to which a PW exists, the PW will be brought operationally down. When the EVPN PE receives traffic over the VPLS PWs, it learns the associated C-MAC addresses in the data-plane. The C-MAC addresses learned over these PWs MUST be injected into the bridge table of the associated MAC-VRF on that EVPN PE. The learned C-MAC addresses MAY also be injected into the RIB/FIB tables of the associated MAC-VRF on that EVPN PE. For seamless integration between EVPN and VPLS PEs, since these PWs belong to the same split-horizon group as the MP2P EVPN service tunnels, then the C-MAC addresses learned and associated to the PWs will NOT be advertised in the control plane to any remote EVPN PEs. This is because every EVPN PE can send and receive traffic directly to/from every VPLS PE belonging to the same VPN instance. The C-MAC addresses learned over local Attachment Circuits (ACs) by an EVPN PE are learned in data-plane. For EVPN PEs, these C-MAC addresses MUST be injected into the corresponding MAC-VRF and advertised in the control-plane using BGP EVPN routes. Furthermore, the C-MAC addresses learned in the control plane via the BGP EVPN routes sent by remote EVPN PEs, are injected into the corresponding MAC-VRF table. 3.3 MAC Mobility In EVPN, host addresses (C-MAC addresses) can move around among EVPN PEs or even between EVPN and VPLS PEs. When a C-MAC address moves from an EVPN PE to a VPLS PE, then as soon as Broadcast/Unknown-unicast/Multicast (BUM) traffic is initiated from that MAC address, it is flooded to all other PEs (both VPLS and EVPN PEs) and the receiving PEs update their MAC tables (VSI or MAC- Sajassi et al. Expires October 25, 2018 [Page 8] INTERNET DRAFT draft-ietf-bess-evpn-vpls-seamless-integ April 25, 2018 VRF). The EVPN PEs do not advertise the C-MAC addresses learned over the PW to each other because every EVPN PE learns them directly over its associated PW to that VPLS PE. If only known-unicast traffic is initiated from the moved C-MAC address toward a known C-MAC, then this can result in black-holing of traffic destined to the C-MAC that has moved until there is a BUM traffic originated with the moved C- MAC address as the source MAC address (e.g., as a result of MAC age- out timer expires). Note that this is behavior typical of VPLS PEs. When a C-MAC address moves from a VPLS PE to an EVPN PE, then as soon as BUM or known-unicast traffic is initiated from that C-MAC address, the C-MAC is learned and advertised in BGP to other EVPN PEs and MAC mobility procedure is exercised among EVPN PEs. For BUM traffic, both EVPN and VPLS PEs learn the new location of the moved C-MAC address; however, if there is only known-unicast traffic, then only EVPN PEs learn the new location of the C-MAC that has moved but not VPLS PEs. This can result in black-holing of traffic sent from VPLS PEs destined to the C-MAC that has moved until there is a BUM traffic originated with the moved C-MAC address as the source MAC address (e.g., as a result of MAC age-out timer expires). Note that this is behavior typical of VPLS PEs. 3.4 Multicast Operation 3.4.1 Ingress Replication The procedures for multicast operation on the VPLS PE, using ingress replication, are per [RFC4761], [RFC4762], and [RFC7080]. The procedures for multicast operation on the EVPN PE, for ingress replication, are as follows: - The EVPN PE builds a replication sub-list to all the remote EVPN PEs per EVPN instance as the result of the exchange of the EVPN IMET routes per [RFC7432]. This will be referred to as sub-list A. It comprises MP2P service tunnels used for delivering EVPN BUM traffic [RFC7432]. - The EVPN PE builds a replication sub-list per VPLS instance to all the remote VPLS PEs. This will be referred to as sub-list B. It comprises PWs from the EVPN PE in question to all the remote VPLS PEs in the same VPLS instance. The replication list, maintained per VPN instance, on a given EVPN PE will be the union of sub-list A and sub-list B. Note that the PE must enable split-horizon over all the entries in the replication list, across both PWs and MP2P service tunnels. Sajassi et al. Expires October 25, 2018 [Page 9] INTERNET DRAFT draft-ietf-bess-evpn-vpls-seamless-integ April 25, 2018 3.4.2 P2MP Tunnel The procedures for multicast operation on the EVPN PEs using P2MP tunnels are outside of the scope of this document. 4 PBB-VPLS Integration with PBB-EVPN In order to support seamless integration between PBB-VPLS and PBB- EVPN PEs, this document requires that PBB-VPLS PEs support VPLS A-D per [RFC6074] and PBB-EVPN PEs support both BGP EVPN routes per [RFC7432] and VPLS A-D per [RFC6074]. All the logic for this seamless integration SHALL reside on the PBB-EVPN PEs. 4.1 Capability Discovery The procedures for capability discovery are per Section 3.1 above. 4.2 Forwarding Setup and Unicast Operation The procedures for forwarding state setup and unicast operation on the PBB-VPLS PE are per [RFC8077] and [RFC7080]. The procedures for forwarding state setup and unicast operation on the PBB-EVPN PE are similar to that of section 3.2 except for the following: - For seamless integration between EVPN and VPLS PEs, the PW that is setup between a pair of PBB-VPLS and PBB-EVPN PEs, is between B- components of PBB-EVPN PE and PBB-VPLS PE per section 4 of [RFC7041]. - When the PBB-EVPN PE receives traffic over the PBB-VPLS PWs, it learns the associated B-MAC addresses in the data-plane. The B-MAC addresses learned over these PWs MUST be injected into the bridge table of the associated MAC-VRF on that PBB-EVPN PE. The learned B- MAC addresses MAY also be injected into the RIB/FIB tables of the associated the MAC-VRF on that BPP-EVPN PE. For seamless integration between PBB-EVPN and PBB-VPLS PEs, since these PWs belongs to the same split-horizon group as the MP2P EVPN service tunnels, then the B-MAC addresses learned and associated to the PWs will NOT be advertised in the control plane to any remote PBB-EVPN PEs. This is because every PBB-EVPN PE can send and receive traffic directly to/from every PBB-VPLS PE belonging to the same VPN instance. - The C-MAC addresses learned over local Attachment Circuits (ACs) by an PBB-EVPN PE are learned in data-plane. For PBB-EVPN PEs, these C- Sajassi et al. Expires October 25, 2018 [Page 10] INTERNET DRAFT draft-ietf-bess-evpn-vpls-seamless-integ April 25, 2018 MAC addresses are learned in I-component of PBB-EVPN PEs and they are not advertised in the control-plane per [RFC7623]. - The B-MAC addresses learned in the control plane via the BGP EVPN routes sent by remote PBB-EVPN PEs, are injected into the corresponding MAC-VRF table. 4.3 MAC Mobility In PBB-EVPN, a given B-MAC address can be learnt either over the BGP control-plane from a remote PBB-EVPN PE, or in the data-plane over a PW from a remote PBB-VPLS PE. There is no mobility associated with B- MAC addresses in this context. Hence, when the same B-MAC address shows up behind both a remote PBB-VPLS PE as well as a PBB-EVPN PE, the local PE can deduce that it is an anomaly and notify the operator. 4.4 Multicast Operation 4.4.1 Ingress Replication The procedures for multicast operation on the PBB-VPLS PE, using ingress replication, are per [RFC7041] and [RFC7080]. The procedures for multicast operation on the PBB-EVPN PE, for ingress replication, are as follows: - The PBB-EVPN PE builds a replication sub-list per I-SID to all the remote PBB-EVPN PEs in a given VPN instance as a result of the exchange of the EVPN IMET routes, as described in [RFC7623]. This will be referred to as sub-list A. It comprises MP2P service tunnels used for delivering PBB-EVPN BUM traffic. - The PBB-EVPN PE builds a replication sub-list per VPN instance to all the remote PBB-VPLS PEs. This will be referred to as sub-list B. It comprises PWs from the PBB-EVPN PE in question to all the remote PBB-VPLS PEs in the same VPN instance. - The PBB-EVPN PE may further prune sub-list B, on a per I-SID basis, if [MMRP] is run over the PBB-VPLS network. This will be referred to as sub-list C. This list comprises a pruned set of the PWs in the sub-list B. The replication list maintained per I-SID on a given PBB-EVPN PE will be the union of sub-list A and sub-list B if [MMRP] is NOT used, and the union of sub-list A and sub-list C if [MMRP] is used. Note that the PE must enable split-horizon over all the entries in the Sajassi et al. Expires October 25, 2018 [Page 11] INTERNET DRAFT draft-ietf-bess-evpn-vpls-seamless-integ April 25, 2018 replication list, across both pseudowires and MP2P service tunnels. 4.4.2 P2MP Tunnel - Inclusive Tree The procedures for multicast operation on the PBB-EVPN PEs using P2MP tunnels are outside of the scope of this document. 5 Security Considerations All the security considerations in [RFC4761], [RFC4762], [RFC7080], [RFC7432], and [RFC7623] apply directly to this document because this document leverages the control plane and the data plane procedures described in these RFCs. This document does not introduce any new security considerations beyond that of the above RFCs because the advertisements and processing of MAC addresses in BGP follow that of [RFC7432] and processing of MAC addresses learned over PWs follow that of [RFC4761], [RFC4762], and [RFC7080]. 6 IANA Considerations This document has no actions for IANA. 7 References 7.1 Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [RFC8077] Martini, et al., "Pseudowire Setup and Maintenance using the Label Distribution Protocol", RFC 8077, February 2017. [RFC7432] Sajassi et al., "BGP MPLS Based Ethernet VPN", RFC 7432, February, 2015. [RFC7623] Sajassi et al., "Provider Backbone Bridging Combined with Sajassi et al. Expires October 25, 2018 [Page 12] INTERNET DRAFT draft-ietf-bess-evpn-vpls-seamless-integ April 25, 2018 Ethernet VPN (PBB-EVPN)", RFC 7623, September, 2015. [RFC4761] Kompella, K., Ed., and Y. Rekhter, Ed., "Virtual Private LAN Service (VPLS) Using BGP for Auto-Discovery and Signaling", RFC 4761, January 2007, . [RFC4762] Lasserre, M., Ed., and V. Kompella, Ed., "Virtual Private LAN Service (VPLS) Using Label Distribution Protocol (LDP) Signaling", RFC 4762, January 2007, . [RFC6074] Rosen et al., "Provisioning, Auto-Discovery, and Signaling in Layer 2 Virtual Private Networks (L2VPNs)", RFC 6074, January 2011. 7.2 Informative References [MMRP] Clause 10 of "IEEE Standard for Local and metropolitan area networks - Media Access Control (MAC) Bridges and Virtual Bridged Local Area Networks", IEEE Std 802.1Q, 2013. [RFC7041] Balus et al., "Extensions to VPLS PE model for Provider Backbone Bridging", RFC 7041, November 2013. [RFC7080] Sajassi et al., "VPLS Interoperability with Provider Backbone Bridges", RFC 7080, December, 2013. [IEEE.802.1ah] IEEE, "IEEE Standard for Local and metropolitan area networks - Media Access Control (MAC) Bridges and Virtual Bridged Local Area Networks", Clauses 25 and 26, IEEE Std 802.1Q, DOI 10.1109/IEEESTD.2011.6009146. [RFC4684] Marques et al., "Constrained Route Distribution for Border Gateway Protocol/MultiProtocol Label Switching (BGP/MPLS) Internet Protocol (IP) Virtual Private Networks (VPNs)", RFC 4684, November, 2006. Authors' Addresses Ali Sajassi Cisco Email: sajassi@cisco.com Sajassi et al. Expires October 25, 2018 [Page 13] INTERNET DRAFT draft-ietf-bess-evpn-vpls-seamless-integ April 25, 2018 Samer Salam Cisco Email: ssalam@cisco.com Nick Del Regno Verizon Email: nick.delregno@verizon.com Jorge Rabadan Nokia Email: jorge.rabadan@nokia.com Sajassi et al. Expires October 25, 2018 [Page 14]