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rfc:rfc7209

Internet Engineering Task Force (IETF) A. Sajassi Request for Comments: 7209 Cisco Category: Informational R. Aggarwal ISSN: 2070-1721 Arktan

                                                             J. Uttaro
                                                                  AT&T
                                                              N. Bitar
                                                               Verizon
                                                         W. Henderickx
                                                        Alcatel-Lucent
                                                              A. Isaac
                                                             Bloomberg
                                                              May 2014
                Requirements for Ethernet VPN (EVPN)

Abstract

 The widespread adoption of Ethernet L2VPN services and the advent of
 new applications for the technology (e.g., data center interconnect)
 have culminated in a new set of requirements that are not readily
 addressable by the current Virtual Private LAN Service (VPLS)
 solution.  In particular, multihoming with all-active forwarding is
 not supported, and there's no existing solution to leverage
 Multipoint-to-Multipoint (MP2MP) Label Switched Paths (LSPs) for
 optimizing the delivery of multi-destination frames.  Furthermore,
 the provisioning of VPLS, even in the context of BGP-based auto-
 discovery, requires network operators to specify various network
 parameters on top of the access configuration.  This document
 specifies the requirements for an Ethernet VPN (EVPN) solution, which
 addresses the above issues.

Status of This Memo

 This document is not an Internet Standards Track specification; it is
 published for informational purposes.
 This document is a product of the Internet Engineering Task Force
 (IETF).  It represents the consensus of the IETF community.  It has
 received public review and has been approved for publication by the
 Internet Engineering Steering Group (IESG).  Not all documents
 approved by the IESG are a candidate for any level of Internet
 Standard; see Section 2 of RFC 5741.
 Information about the current status of this document, any errata,
 and how to provide feedback on it may be obtained at
 http://www.rfc-editor.org/info/rfc7209.

Sajassi, et al. Informational [Page 1] RFC 7209 Requirements for Ethernet VPN May 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 ....................................................3
 2. Specification of Requirements ...................................4
 3. Terminology .....................................................4
 4. Redundancy Requirements .........................................5
    4.1. Flow-Based Load Balancing ..................................5
    4.2. Flow-Based Multipathing ....................................6
    4.3. Geo-redundant PE Nodes .....................................7
    4.4. Optimal Traffic Forwarding .................................7
    4.5. Support for Flexible Redundancy Grouping ...................8
    4.6. Multihomed Network .........................................8
 5. Multicast Optimization Requirements .............................9
 6. Ease of Provisioning Requirements ...............................9
 7. New Service Interface Requirements .............................10
 8. Fast Convergence ...............................................12
 9. Flood Suppression ..............................................12
 10. Supporting Flexible VPN Topologies and Policies ...............12
 11. Security Considerations .......................................13
 12. Normative References ..........................................13
 13. Informative References ........................................14
 14. Contributors ..................................................15

Sajassi, et al. Informational [Page 2] RFC 7209 Requirements for Ethernet VPN May 2014

1. Introduction

 Virtual Private LAN Service (VPLS), as defined in [RFC4664],
 [RFC4761], and [RFC4762], is a proven and widely deployed technology.
 However, the existing solution has a number of limitations when it
 comes to redundancy, multicast optimization, and provisioning
 simplicity.  Furthermore, new applications are driving several new
 requirements for other L2VPN services such as Ethernet Tree (E-Tree)
 and Virtual Private Wire Service (VPWS).
 In the area of multihoming, current VPLS can only support multihoming
 with the single-active redundancy mode (defined in Section 3), for
 example, as described in [VPLS-BGP-MH].  Flexible multihoming with
 all-active redundancy mode (defined in Section 3) cannot be supported
 by the current VPLS solution.
 In the area of multicast optimization, [RFC7117] describes how
 multicast LSPs can be used in conjunction with VPLS.  However, this
 solution is limited to Point-to-Multipoint (P2MP) LSPs, as there's no
 defined solution for leveraging Multipoint-to-Multipoint (MP2MP) LSPs
 with VPLS.
 In the area of provisioning simplicity, current VPLS does offer a
 mechanism for single-sided provisioning by relying on BGP-based
 service auto-discovery [RFC4761] [RFC6074].  This, however, still
 requires the operator to configure a number of network-side
 parameters on top of the access-side Ethernet configuration.
 In the area of data-center interconnect, applications are driving the
 need for new service interface types that are a hybrid combination of
 VLAN bundling and VLAN-based service interfaces.  These are referred
 to as "VLAN-aware bundling" service interfaces.
 Virtualization applications are also fueling an increase in the
 volume of MAC (Media Access Control) addresses that are to be handled
 by the network; this gives rise to the requirement for having the
 network reconvergence upon failure be independent of the number of
 MAC addresses learned by the Provider Edge (PE).
 There are requirements for minimizing the amount of flooding of
 multi-destination frames and localizing the flooding to the confines
 of a given site.
 There are also requirements for supporting flexible VPN topologies
 and policies beyond those currently covered by VPLS and Hierarchical
 VPLS (H-VPLS).

Sajassi, et al. Informational [Page 3] RFC 7209 Requirements for Ethernet VPN May 2014

 The focus of this document is on defining the requirements for a new
 solution, namely, Ethernet VPN (EVPN), which addresses the above
 issues.
 Section 4 discusses the redundancy requirements.  Section 5 describes
 the multicast optimization requirements.  Section 6 articulates the
 ease of provisioning requirements.  Section 7 focuses on the new
 service interface requirements.  Section 8 highlights the fast
 convergence requirements.  Section 9 describes the flood suppression
 requirement, and finally Section 10 discusses the requirements for
 supporting flexible VPN topologies and policies.

2. Specification of Requirements

 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].
 This document is not a protocol specification and the key words in
 this document are used for clarity and emphasis of requirements
 language.

3. Terminology

 AS: Autonomous System
 CE: Customer Edge
 E-Tree: Ethernet Tree
 MAC address: Media Access Control address - referred to as MAC
 LSP: Label Switched Path
 PE: Provider Edge
 MP2MP: Multipoint to Multipoint
 VPLS: Virtual Private LAN Service
 Single-Active Redundancy Mode: When a device or a network is
 multihomed to a group of two or more PEs and when only a single PE in
 such a redundancy group can forward traffic to/from the multihomed
 device or network for a given VLAN, such multihoming is referred to
 as "Single-Active".

Sajassi, et al. Informational [Page 4] RFC 7209 Requirements for Ethernet VPN May 2014

 All-Active Redundancy Mode: When a device is multihomed to a group of
 two or more PEs and when all PEs in such redundancy group can forward
 traffic to/from the multihomed device or network for a given VLAN,
 such multihoming is referred to as "All-Active".

4. Redundancy Requirements

4.1. Flow-Based Load Balancing

 A common mechanism for multihoming a CE node to a set of PE nodes
 involves leveraging multi-chassis Ethernet link aggregation groups
 (LAGs) based on [802.1AX].  [PWE3-ICCP] describes one such scheme.
 In Ethernet link aggregation, the load-balancing algorithms by which
 a CE distributes traffic over the Attachment Circuits connecting to
 the PEs are quite flexible.  The only requirement is for the
 algorithm to ensure in-order frame delivery for a given traffic flow.
 In typical implementations, these algorithms involve selecting an
 outbound link within the bundle based on a hash function that
 identifies a flow based on one or more of the following fields:
 i.   Layer 2: Source MAC Address, Destination MAC Address, VLAN
 ii.  Layer 3: Source IP Address, Destination IP Address
 iii. Layer 4: UDP or TCP Source Port, Destination Port
 A key point to note here is that [802.1AX] does not define a standard
 load-balancing algorithm for Ethernet bundles, and, as such,
 different implementations behave differently.  As a matter of fact, a
 bundle operates correctly even in the presence of asymmetric load
 balancing over the links.  This being the case, the first requirement
 for all-active multihoming is the ability to accommodate flexible
 flow-based load balancing from the CE node based on L2, L3, and/or L4
 header fields.
 (R1a) A solution MUST be capable of supporting flexible flow-based
       load balancing from the CE as described above.
 (R1b) A solution MUST also be able to support flow-based load
       balancing of traffic destined to the CE, even when the CE is
       connected to more than one PE.  Thus, the solution MUST be able
       to exercise multiple links connected to the CE, irrespective of
       the number of PEs that the CE is connected to.
 It should be noted that when a CE is multihomed to several PEs, there
 could be multiple Equal-Cost Multipath (ECMP) paths from each remote
 PE to each multihoming PE.  Furthermore, for an all-active multihomed
 CE, a remote PE can choose any of the multihoming PEs for sending

Sajassi, et al. Informational [Page 5] RFC 7209 Requirements for Ethernet VPN May 2014

 traffic destined to the multihomed CE.  Therefore, when a solution
 supports all-active multihoming, it MUST exercise as many of these
 paths as possible for traffic destined to a multihomed CE.
 (R1c) A solution SHOULD support flow-based load balancing among PEs
       that are members of a redundancy group spanning multiple
       Autonomous Systems.

4.2. Flow-Based Multipathing

 Any solution that meets the all-active redundancy mode (e.g., flow-
 based load balancing) described in Section 4.1, also needs to
 exercise multiple paths between a given pair of PEs.  For instance,
 if there are two or more LSPs between a remote PE and a pair of PEs
 in an all-active redundancy group, then the solution needs to be
 capable of load balancing traffic among those LSPs on a per-flow
 basis for traffic destined to the PEs in the redundancy group.
 Furthermore, if there are two or more ECMP paths between a remote PE
 and one of the PEs in the redundancy group, then the solution needs
 to leverage all the equal-cost LSPs.  For the latter, the solution
 can also leverage the load-balancing capabilities based on entropy
 labels [RFC6790].
 (R2a) A solution MUST be able to exercise all LSPs between a remote
       PE and all the PEs in the redundancy group with all-active
       multihoming.
 (R2b) A solution MUST be able to exercise all ECMP paths between a
       remote PE and any of the PEs in the redundancy group with all-
       active multihoming.
 For example, consider a scenario in which CE1 is multihomed to PE1
 and PE2, and CE2 is multihomed to PE3 and PE4 running in all-active
 redundancy mode.  Furthermore, consider that there exist three ECMP
 paths between any of the CE1's and CE2's multihomed PEs.  Traffic
 from CE1 to CE2 can be forwarded on twelve different paths over the
 MPLS/IP core as follows: CE1 load balances traffic to both PE1 and
 PE2.  Each of PE1 and PE2 have three ECMP paths to PE3 and PE4 for a
 total of twelve paths.  Finally, when traffic arrives at PE3 and PE4,
 it gets forwarded to CE2 over the Ethernet channel (aka link bundle).
 It is worth pointing out that flow-based multipathing complements
 flow-based load balancing described in the previous section.

Sajassi, et al. Informational [Page 6] RFC 7209 Requirements for Ethernet VPN May 2014

4.3. Geo-redundant PE Nodes

 The PE nodes offering multihomed connectivity to a CE or access
 network may be situated in the same physical location (co-located),
 or may be spread geographically (e.g., in different Central Offices
 (COs) or Points of Presence (POPs)).  The latter is needed when
 offering a geo-redundant solution that ensures business continuity
 for critical applications in the case of power outages, natural
 disasters, etc.  An all-active multihoming mechanism needs to support
 both co-located as well as geo-redundant PE placement.  The latter
 scenario often means that requiring a dedicated link between the PEs,
 for the operation of the multihoming mechanism, is not appealing from
 a cost standpoint.  Furthermore, the IGP cost from remote PEs to the
 pair of PEs in the dual-homed setup cannot be assumed to be the same
 when those latter PEs are geo-redundant.
 (R3a) A solution MUST support all-active multihoming without the need
       for a dedicated control/data link among the PEs in the
       multihomed group.
 (R3b) A solution MUST support different IGP costs from a remote PE to
       each of the PEs in a multihomed group.
 (R3c) A solution MUST support multihoming across different IGP
       domains within the same Autonomous System.
 (R3d) A solution SHOULD support multihoming across multiple
       Autonomous Systems.

4.4. Optimal Traffic Forwarding

 In a typical network, when considering a designated pair of PEs, it
 is common to find both single-homed as well as multihomed CEs being
 connected to those PEs.
 (R4)  An all-active multihoming solution SHOULD support optimal
       forwarding of unicast traffic for all the following scenarios.
       By "optimal forwarding", we mean that traffic will not be
       forwarded between PE devices that are members of a multihomed
       group unless the destination CE is attached to one of the
       multihoming PEs.
       i.   single-homed CE to multihomed CE
       ii.  multihomed CE to single-homed CE
       iii. multihomed CE to multihomed CE
 This is especially important in the case of geo-redundant PEs, where
 having traffic forwarded from one PE to another within the same

Sajassi, et al. Informational [Page 7] RFC 7209 Requirements for Ethernet VPN May 2014

 multihomed group introduces additional latency, on top of the
 inefficient use of the PE node's and core nodes' switching capacity.
 A multihomed group (also known as a multi-chassis LAG) is a group of
 PEs supporting a multihomed CE.

4.5. Support for Flexible Redundancy Grouping

 (R5) In order to support flexible redundancy grouping, the
       multihoming mechanism SHOULD allow arbitrary grouping of PE
       nodes into redundancy groups where each redundancy group
       represents all multihomed devices/networks that share the same
       group of PEs.
 This is best explained with an example: consider three PE nodes --
 PE1, PE2, and PE3.  The multihoming mechanism MUST allow a given PE,
 say, PE1, to be part of multiple redundancy groups concurrently.  For
 example, there can be a group (PE1, PE2), a group (PE1, PE3), and
 another group (PE2, PE3) where CEs could be multihomed to any one of
 these three redundancy groups.

4.6. Multihomed Network

 There are applications that require an Ethernet network, rather than
 a single device, to be multihomed to a group of PEs.  The Ethernet
 network would typically run a resiliency mechanism such as Multiple
 Spanning Tree Protocol [802.1Q] or Ethernet Ring Protection Switching
 [G.8032].  The PEs may or may not participate in the control protocol
 of the Ethernet network.  For a multihomed network running [802.1Q]
 or [G.8032], these protocols require that each VLAN to be active only
 on one of the multihomed links.
 (R6a) A solution MUST support multihomed network connectivity with
       single-active redundancy mode where all VLANs are active on one
       PE.
 (R6b) A solution MUST also support multihomed networks with single-
       active redundancy mode where disjoint VLAN sets are active on
       disparate PEs.
 (R6c) A solution SHOULD support single-active redundancy mode among
       PEs that are members of a redundancy group spanning multiple
       ASes.
 (R6d) A solution MAY support all-active redundancy mode for a
       multihomed network with MAC-based load balancing (i.e.,
       different MAC addresses on a VLAN are reachable via different
       PEs).

Sajassi, et al. Informational [Page 8] RFC 7209 Requirements for Ethernet VPN May 2014

5. Multicast Optimization Requirements

 There are environments where the use of MP2MP LSPs may be desirable
 for optimizing multicast, broadcast, and unknown unicast traffic in
 order to reduce the amount of multicast states in the core routers.
 [RFC7117] precludes the use of MP2MP LSPs since current VPLS
 solutions require an egress PE to perform learning when it receives
 unknown unicast packets over an LSP.  This is challenging when MP2MP
 LSPs are used, as they do not have inherent mechanisms to identify
 the sender.  The use of MP2MP LSPs for multicast optimization becomes
 tractable if the need to identify the sender for performing learning
 is lifted.
 (R7a) A solution MUST be able to provide a mechanism that does not
       require MAC learning against MPLS LSPs when packets are
       received over a MP2MP LSP.
 (R7b) A solution SHOULD be able to provide procedures to use MP2MP
       LSPs for optimizing delivery of multicast, broadcast, and
       unknown unicast traffic.

6. Ease of Provisioning Requirements

 As L2VPN technologies expand into enterprise deployments, ease of
 provisioning becomes paramount.  Even though current VPLS has an
 auto-discovery mechanism, which enables automated discovery of member
 PEs belonging to a given VPN instance over the MPLS/IP core network,
 further simplifications are required, as outlined below:
 (R8a) The solution MUST support auto-discovery of VPN member PEs over
       the MPLS/IP core network, similar to the VPLS auto-discovery
       mechanism described in [RFC4761] and [RFC6074].
 (R8b) The solution SHOULD support auto-discovery of PEs belonging to
       a given redundancy or multihomed group.
 (R8c) The solution SHOULD support auto-sensing of the site ID for a
       multihomed device or network and support auto-generation of the
       redundancy group ID based on the site ID.
 (R8d) The solution SHOULD support automated Designated Forwarder (DF)
       election among PEs participating in a redundancy (multihoming)
       group and be able to divide service instances (e.g., VLANs)
       among member PEs of the redundancy group.
 (R8e) For deployments where VLAN identifiers are global across the
       MPLS network (i.e., the network is limited to a maximum of 4K
       services), the PE devices SHOULD derive the MPLS-specific

Sajassi, et al. Informational [Page 9] RFC 7209 Requirements for Ethernet VPN May 2014

       attributes (e.g., VPN ID, BGP Route Target, etc.) from the VLAN
       identifier.  This way, it is sufficient for the network
       operator to configure the VLAN identifier(s) for the access
       circuit, and all the MPLS and BGP parameters required for
       setting up the service over the core network would be
       automatically derived without any need for explicit
       configuration.
 (R8f) Implementations SHOULD revert to using default values for
       parameters for which no new values are configured.

7. New Service Interface Requirements

 [MEF] and [802.1Q] have the following services specified:
  1. Port mode: in this mode, all traffic on the port is mapped to a

single bridge domain and a single corresponding L2VPN service

    instance.  Customer VLAN transparency is guaranteed end to end.
  1. VLAN mode: in this mode, each VLAN on the port is mapped to a

unique bridge domain and corresponding L2VPN service instance.

    This mode allows for service multiplexing over the port and
    supports optional VLAN translation.
  1. VLAN bundling: in this mode, a group of VLANs on the port are

collectively mapped to a unique bridge domain and corresponding

    L2VPN service instance.  Customer MAC addresses must be unique
    across all VLANs mapped to the same service instance.
 For each of the above services, a single bridge domain is assigned
 per service instance on the PE supporting the associated service.
 For example, in case of the port mode, a single bridge domain is
 assigned for all the ports belonging to that service instance,
 regardless of the number of VLANs coming through these ports.
 It is worth noting that the term 'bridge domain' as used above refers
 to a MAC forwarding table as defined in the IEEE bridge model and
 does not denote or imply any specific implementation.
 [RFC4762] defines two types of VPLS services based on "unqualified
 and qualified learning", which in turn maps to port mode and VLAN
 mode, respectively.
 (R9a) A solution MUST support the above three service types (port
       mode, VLAN mode, and VLAN bundling).

Sajassi, et al. Informational [Page 10] RFC 7209 Requirements for Ethernet VPN May 2014

 For hosted applications for data-center interconnect, network
 operators require the ability to extend Ethernet VLANs over a WAN
 using a single L2VPN instance while maintaining data-plane separation
 between the various VLANs associated with that instance.  This is
 referred to as 'VLAN-aware bundling service'.
 (R9b) A solution MAY support VLAN-aware bundling service.
 This gives rise to two new service interface types: VLAN-aware
 bundling without translation and VLAN-aware bundling with
 translation.
 The service interface for VLAN-aware bundling without translation has
 the following characteristics:
  1. The service interface provides bundling of customer VLANs into a

single L2VPN service instance.

  1. The service interface guarantees customer VLAN transparency end to

end.

  1. The service interface maintains data-plane separation between the

customer VLANs (i.e., creates a dedicated bridge-domain per VLAN).

 In the special case of all-to-one bundling, the service interface
 must not assume any a priori knowledge of the customer VLANs.  In
 other words, the customer VLANs shall not be configured on the PE;
 rather, the interface is configured just like a port-based service.
 The service interface for VLAN-aware bundling with translation has
 the following characteristics:
  1. The service interface provides bundling of customer VLANs into a

single L2VPN service instance.

  1. The service interface maintains data-plane separation between the

customer VLANs (i.e., creates a dedicated bridge-domain per VLAN).

  1. The service interface supports customer VLAN ID translation to

handle the scenario where different VLAN Identifiers (VIDs) are

    used on different interfaces to designate the same customer VLAN.
 The main difference, in terms of service-provider resource
 allocation, between these new service types and the previously
 defined three types is that the new services require several bridge
 domains to be allocated (one per customer VLAN) per L2VPN service
 instance as opposed to a single bridge domain per L2VPN service
 instance.

Sajassi, et al. Informational [Page 11] RFC 7209 Requirements for Ethernet VPN May 2014

8. Fast Convergence

 (R10a) A solution MUST provide the ability to recover from PE-CE
        attachment circuit failures as well as PE node failure for the
        cases of both multihomed device and multihomed network.
 (R10b) The recovery mechanism(s) MUST provide convergence time that
        is independent of the number of MAC addresses learned by the
        PE.  This is particularly important in the context of
        virtualization applications, which are fueling an increase in
        the number of MAC addresses to be handled by the Layer 2
        network.
 (R10c) Furthermore, the recovery mechanism(s) SHOULD provide
        convergence time that is independent of the number of service
        instances associated with the attachment circuit or the PE.

9. Flood Suppression

 (R11a) The solution SHOULD allow the network operator to choose
        whether unknown unicast frames are to be dropped or to be
        flooded.  This attribute needs to be configurable on a per-
        service-instance basis.
 (R11b) In addition, for the case where the solution is used for data-
        center interconnect, the solution SHOULD minimize the flooding
        of broadcast frames outside the confines of a given site.  Of
        particular interest is periodic Address Resolution Protocol
        (ARP) traffic.
 (R11c) Furthermore, the solution SHOULD eliminate any unnecessary
        flooding of unicast traffic upon topology changes, especially
        in the case of a multihomed site where the PEs have a priori
        knowledge of the backup paths for a given MAC address.

10. Supporting Flexible VPN Topologies and Policies

 (R12a) A solution MUST be capable of supporting flexible VPN
        topologies that are not constrained by the underlying
        mechanisms of the solution.
 One example of this is E-Tree topology, where one or more sites in
 the VPN are roots and the others are leaves.  The roots are allowed
 to send traffic to other roots and to leaves, while leaves can
 communicate only with the roots.  The solution MUST provide the
 ability to support E-Tree topology.

Sajassi, et al. Informational [Page 12] RFC 7209 Requirements for Ethernet VPN May 2014

 (R12b) The solution MAY provide the ability to apply policies at the
        granularity of the MAC address to control which PEs in the VPN
        learn which MAC address and how a specific MAC address is
        forwarded.  It should be possible to apply policies to allow
        only some of the member PEs in the VPN to send or receive
        traffic for a particular MAC address.
 (R12c) A solution MUST be capable of supporting both inter-AS
        option-C and inter-AS option-B scenarios as described in
        [RFC4364].

11. Security Considerations

 Any protocol extensions developed for the EVPN solution shall include
 the appropriate security analysis.  Besides the security requirements
 covered in [RFC4761] and [RFC4762] when MAC learning is performed in
 data-plane and in [RFC4364] when MAC learning is performed in control
 plane, the following additional requirements need to be covered.
 (R13) A solution MUST be capable of detecting and properly handling a
       situation where the same MAC address appears behind two
       different Ethernet segments (whether inadvertently or
       maliciously).
 (R14) A solution MUST be capable of associating a MAC address to a
       specific Ethernet segment (aka "sticky MAC") in order to help
       limit malicious traffic into a network for that MAC address.
       This capability can limit the appearance of spoofed MAC
       addresses on a network.  When this feature is enabled, the MAC
       mobility for such sticky MAC addresses are disallowed, and the
       traffic for such MAC addresses from any other Ethernet segment
       MUST be discarded.

12. Normative References

 [802.1AX]  IEEE, "IEEE Standard for Local and metropolitan area
            networks - Link Aggregation", Std. 802.1AX-2008, IEEE
            Computer Society, November 2008.
 [802.1Q]   IEEE, "IEEE Standard for Local and metropolitan area
            networks - Virtual Bridged Local Area Networks", Std.
            802.1Q-2011, 2011.
 [G.8032]   ITU-T, "Ethernet ring protection switching", ITU-T
            Recommendation G.8032, February 2012.
 [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
            Requirement Levels", BCP 14, RFC 2119, March 1997.

Sajassi, et al. Informational [Page 13] RFC 7209 Requirements for Ethernet VPN May 2014

 [RFC4364]  Bersani, F. and H. Tschofenig, "The EAP-PSK Protocol: A
            Pre-Shared Key Extensible Authentication Protocol (EAP)
            Method", RFC 4764, January 2007.
 [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, E., Davie, B., Radoaca, V., and W. Luo,
            "Provisioning, Auto-Discovery, and Signaling in Layer 2
            Virtual Private Networks (L2VPNs)", RFC 6074, January
            2011.

13. Informative References

 [VPLS-BGP-MH]
            Kothari, B., Kompella, K., Henderickx, W., Balue, F.,
            Uttaro, J., Palislamovic, S., and W. Lin, "BGP based
            Multi-homing in Virtual Private LAN Service", Work in
            Progress, July 2013.
 [PWE3-ICCP]
            Martini, L., Salam, S., Sajassi, A., and S. Matsushima,
            "Inter-Chassis Communication Protocol for L2VPN PE
            Redundancy", Work in Progress, March 2014.
 [MEF]      Metro Ethernet Forum, "Ethernet Service Definitions", MEF
            6.1 Technical Specification, April 2008.
 [RFC4664]  Andersson, L., Ed., and E. Rosen, Ed., "Framework for
            Layer 2 Virtual Private Networks (L2VPNs)", RFC 4664,
            September 2006.
 [RFC6790]  Kompella, K., Drake, J., Amante, S., Henderickx, W., and
            L. Yong, "The Use of Entropy Labels in MPLS Forwarding",
            RFC 6790, November 2012.
 [RFC7117]  Aggarwal, R., Ed., Kamite, Y., Fang, L., Rekhter, Y., and
            C. Kodeboniya, "Multicast in Virtual Private LAN Service
            (VPLS)", RFC 7117, February 2014.

Sajassi, et al. Informational [Page 14] RFC 7209 Requirements for Ethernet VPN May 2014

14. Contributors

 Samer Salam, Cisco, ssalam@cisco.com
 John Drake, Juniper, jdrake@juniper.net
 Clarence Filsfils, Cisco, cfilsfil@cisco.com

Authors' Addresses

 Ali Sajassi
 Cisco
 EMail: sajassi@cisco.com
 Rahul Aggarwal
 Arktan
 EMail: raggarwa_1@yahoo.com
 James Uttaro
 AT&T
 EMail: uttaro@att.com
 Nabil Bitar
 Verizon Communications
 EMail: nabil.n.bitar@verizon.com
 Wim Henderickx
 Alcatel-Lucent
 EMail: wim.henderickx@alcatel-lucent.com
 Aldrin Isaac
 Bloomberg
 EMail: aisaac71@bloomberg.net

Sajassi, et al. Informational [Page 15]

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