Virtual Private LAN Service (VPLS) Using Label Distribution Protocol (LDP) Signaling
RFC 4762
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RFC - Proposed Standard
(January 2007; Errata)
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2015-10-14
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IETF
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plain text
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(None)
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No shepherd assigned
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IESG state |
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RFC 4762 (Proposed Standard)
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Unknown
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Mark Townsley
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Network Working Group M. Lasserre, Ed.
Request for Comments: 4762 V. Kompella, Ed.
Category: Standards Track Alcatel-Lucent
January 2007
Virtual Private LAN Service (VPLS) Using
Label Distribution Protocol (LDP) Signaling
Status of This Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The IETF Trust (2007).
IESG Note
The L2VPN Working Group produced two separate documents, RFC 4761 and
this document, that perform similar functions using different
signaling protocols. Be aware that each method is commonly referred
to as "VPLS" even though they are distinct and incompatible with one
another.
Abstract
This document describes a Virtual Private LAN Service (VPLS) solution
using pseudowires, a service previously implemented over other
tunneling technologies and known as Transparent LAN Services (TLS).
A VPLS creates an emulated LAN segment for a given set of users;
i.e., it creates a Layer 2 broadcast domain that is fully capable of
learning and forwarding on Ethernet MAC addresses and that is closed
to a given set of users. Multiple VPLS services can be supported
from a single Provider Edge (PE) node.
This document describes the control plane functions of signaling
pseudowire labels using Label Distribution Protocol (LDP), extending
RFC 4447. It is agnostic to discovery protocols. The data plane
functions of forwarding are also described, focusing in particular on
the learning of MAC addresses. The encapsulation of VPLS packets is
described by RFC 4448.
Lasserre & Kompella Standards Track [Page 1]
RFC 4762 Virtual Private LAN Service over LDP January 2007
Table of Contents
1. Introduction ....................................................3
2. Terminology .....................................................3
2.1. Conventions ................................................4
3. Acronyms ........................................................4
4. Topological Model for VPLS ......................................5
4.1. Flooding and Forwarding ....................................6
4.2. Address Learning ...........................................6
4.3. Tunnel Topology ............................................7
4.4. Loop free VPLS .............................................7
5. Discovery .......................................................7
6. Control Plane ...................................................7
6.1. LDP-Based Signaling of Demultiplexers ......................8
6.1.1. Using the Generalized PWid FEC Element ..............8
6.2. MAC Address Withdrawal .....................................9
6.2.1. MAC List TLV ........................................9
6.2.2. Address Withdraw Message Containing MAC List TLV ...11
7. Data Forwarding on an Ethernet PW ..............................11
7.1. VPLS Encapsulation Actions ................................11
7.2. VPLS Learning Actions .....................................12
8. Data Forwarding on an Ethernet VLAN PW .........................13
8.1. VPLS Encapsulation Actions ................................13
9. Operation of a VPLS ............................................14
9.1. MAC Address Aging .........................................15
10. A Hierarchical VPLS Model .....................................16
10.1. Hierarchical Connectivity ................................16
10.1.1. Spoke Connectivity for Bridging-Capable Devices ...17
10.1.2. Advantages of Spoke Connectivity ..................18
10.1.3. Spoke Connectivity for Non-Bridging Devices .......19
10.2. Redundant Spoke Connections ..............................21
10.2.1. Dual-Homed MTU-s ..................................21
10.2.2. Failure Detection and Recovery ....................22
10.3. Multi-domain VPLS Service ................................23
11. Hierarchical VPLS Model Using Ethernet Access Network .........23
11.1. Scalability ..............................................24
11.2. Dual Homing and Failure Recovery .........................24
12. Contributors ..................................................25
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