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Concluded WG Layer 2 Virtual Private Networks (l2vpn)

Note: The data for concluded WGs is occasionally incorrect.

WG Name Layer 2 Virtual Private Networks
Acronym l2vpn
Area Routing Area (rtg)
State Concluded
Charter charter-ietf-l2vpn-05 Approved
Document dependencies
Additional resources Issue tracker, Wiki
Personnel Chairs Dr. Nabil N. Bitar, Giles Heron
Area Director Adrian Farrel
Tech Advisor Alex D. Zinin
Secretary Andrew McLachlan
Liaison Contacts Danny R. McPherson
Shane M. Amante
Stewart Bryant
Vach Kompella
Mailing list Address l2vpn@ietf.org
To subscribe https://www.ietf.org/mailman/listinfo/l2vpn
Archive https://mailarchive.ietf.org/arch/browse/l2vpn

Final Charter for Working Group

The L2VPN working group is responsible for defining and specifying a
limited number of solutions for supporting provider-provisioned Layer-2
Virtual Private Networks (L2VPNs). It will also address requirements
driven by cloud computing services and data centers as they apply to
Layer-2 VPN services.

Layer-2 VPNs defined by L2VPN operate over pseudowires (PWs) as
defined by the PWE3 WG or over IP or MPLS PSN tunnels. A L2VPN
emulates a "native" service over a PSN that is adequately faithful
to, but may not be entirely indistinguishable from the native
service itself. Further, following in the "edge-to-edge" nature
of the service, the L2VPN WG will not define any mechanisms
which exert control over the underlying PSN. When necessary it
may, however, recommend or require the use of existing PSN QoS
and path control mechanisms between the PEs which provide the
L2VPN connectivity.

Layer-2 VPNs comprise the following:

  1. Virtual Private LAN Service (VPLS) -- A Layer-2 service
    that emulates a switched Ethernet (V)LAN across a PSN.

  2. Virtual Private Wire Service (VPWS) -- A Layer-2 service that
    provides point-to-point connectivity for a variety of link layers,
    including Frame Relay, ATM, Ethernet, PPP, etc., across a PSN.

  3. Virtual Private Multicast Service (VPMS) -- A Layer-2 service that
    provides point-to-multipoint connectivity for a variety of link
    layers across a PSN.

  4. IP-only L2VPN, an IP-only service over a PSN. The WG will address
    two specific types of IP-only L2VPN:

a) Point-to-point Layer-2 VPN. This service is similar to VPWS, but
also supports heterogenous Attachment Circuits at either end
of a single point-to-point service.

b) Multipoint-to-multipoint Layer-2 VPN. This service is similar
to VPLS, but learns IP and MAC address bindings from ARPs and
broadcast/multicast IP packets.

  1. Ethernet VPN (E-VPN) - An enhanced Layer-2 service that
    emulates an Ethernet (V)LAN across a PSN. E-VPN supports
    load-sharing across multiple connections from a Layer-2 site
    to an L2VPN service. E-VPN is primarily targeted to support
    large-scale L2VPNs with resiliency requirements not satisfied
    by other L2VPN solutions.

  2. E-Tree, a Layer-2 service defined by the MEF, which provides
    connectivity between one or more root nodes and one or more leaf
    nodes, with the restriction that leaf nodes may only communicate
    with root node(s) (and not with each other).

L2VPNs will make use of existing IETF specified mechanisms
unless there are technical reasons why the existing mechanisms
are insufficient or unnecessary.

The L2VPN WG is responsible for specification of the
discovery and membership of PEs participating in a Layer-2
VPN as well as the membership of CE devices for a specific
instance of an L2VPN.

The L2VPN WG will provide extensions of existing protocols
that will be discussed in protocol-specific WGs. In
particular, the L2VPN WG may define extensions to pseudowire
management mechanisms for VPLS. Those extensions will
be reviewed by the PWE3 WG to ensure they are aligned
with the overall design/architecture of PWE3.

The L2VPN WG will not define new encapsulations, control,
or resiliency mechanisms specifically related to pseudowires.
Furthermore, when the L2VPN solution is based on PWs, the
L2VPN WG will not define protocol inter-working between
an L2VPN and native service Layer-2 OAM or resiliency
mechanisms. The L2VPN WG may define how to operate native
service-layer control, OAM or resiliency mechanisms on
top of an L2VPN. In addition, it may define native data
plane and/or control plane interworking between an
L2VPN and an associated native Layer-2 service.

The L2VPN WG scope includes the following:

  1. Discovery of PEs participating in a Layer-2 VPN and the
    associated topology required for connectivity of the VPLS,
    VPWS, VPMS or E-VPN service.

  2. Signaling of information related to the discovery and
    membership of PEs within a L2VPN. These procedures must
    use PWE3 control and management procedures, or define
    requirements for extensions of PWE3 protocols to suit
    the needs of an L2VPN, when the L2VPN operates over PWs.
    Once those requirements have been reviewed by the L2VPN WG,
    they should be provided to the PWE3 WG to derive solutions.

  3. MIBs for Layer-2 VPN solutions.

  4. Specification of requirements, framework and solutions
    that facilitate Operations Administration and Management
    (OAM) of any type of L2VPN within the scope of the L2VPN
    Working Group.

  5. Mechanisms to permit optimization of multicast data
    traffic within an L2VPN.

  6. If transport does not involve PWs, mechanisms that
    support load-balancing/multi-pathing between PEs
    interconnecting a Layer-2 service using an L2VPN across
    the PSN.

  7. requirements for the multi-homing of CEs to several
    VPLS or E-VPN PEs, inclusive of active/backup and active/
    active (load-sharing) configurations. Based on these
    requirements define VPLS or E-VPN control plane
    solutions for achieving fast convergence after failure
    of an active path in the PSN or on the AC side.

  8. Enhancements to increase the scalability of the Control
    Plane and Data Plane of L2VPN PE nodes, and of core nodes
    that provide transport services for L2VPN.

  9. Requirements and solutions for Auto-Discovery and
    Signaling of Inter-AS L2VPNs, in addition to Inter-AS
    solutions for multicast-optimized L2VPNs.

  10. Requirements and solutions for supporting "E-Tree"
    services using VPLS.

Milestones

Date Milestone Associated documents
Apr 2013 Submit E-VPN MIB to IESG
Mar 2013 Submit E-VPN OAM to IESG
Dec 2012 Submit E-Tree MIB to IESG
Nov 2012 Submit E-Tree OAM to IESG
Nov 2012 Submit E-VPN solution to IESG
Jul 2012 Submit OAM solutions for IP-only L2VPN to IESG
Jul 2012 Submit Auto-Discovery solution for VPMS to IESG
Jul 2012 Submit VPLS service convergence improvement solutions to IESG
Jul 2012 Submit VPLS multi-homing solutions to IESG
Jul 2012 Submit E-Tree solution to IESG
Jul 2012 Submit E-VPN requirements/framework to IESG
Jul 2012 Submit MIB for IP-only L2VPN to IESG
Mar 2012 Submit scalability solutions for VPLS Control-Plane to IESG
Mar 2012 Submit E-Tree requirements/framework to IESG
Mar 2012 Submit scalability solutions for VPLS Data-Plane to IESG
Nov 2011 Submit MIB for VPWS to IESG
Nov 2011 Submit MIB for VPLS to IESG
Nov 2011 Submit I-D on Virtual Private Multicast Service (VPMS) requirements to IESG
Nov 2011 Submit signaling solution for multicast-optimized VPLS to IESG
Nov 2011 Submit OAM solutions for VPLS to IESG
Nov 2011 Submit OAM solutions for VPWS to IESG
Oct 2011 Submit IP-only L2VPN solution documents to IESG

Done milestones

Date Milestone Associated documents
Done Submit Auto-Discovery and Signaling for Intra-AS and Inter-AS VPLS and VPWS Layer-2 VPNs
Done Submit VPWS solution documents to IESG
Done Submit VPLS solution documents to IESG
Done Submit L2 framework to IESG for publication as Informational RFC
Done Identify VPLS and VPWS solutions for the WG
Done Submit L2 requirements to IESG for publication as Informational RFC
Done Submit an I-D describing MIB for VPLS
Done Submit an I-D on OAM requirements for VPWS
Done Submit an I-D on OAM requirements for VPLS
Done Submit an I-D describing MIB for VPWS