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首页Juniper Seamless MPLS (BGP-LU)详解
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WHITE PAPER
Copyright © 2010, Juniper Networks, Inc. 1
SEAMLESS MPLS
2 Copyright © 2010, Juniper Networks, Inc.
WHITE PAPER - Seamless MPLS
Table of Contents
Abstract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
MPLS in the Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Benefits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Scaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Effectiveness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
“Thus Far, but No Further” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Seamless MPLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Network Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Connectivity Blueprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Transport Pseudowires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Scaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Control Plane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Putting It All Together . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Service Restoration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
OAM: Failure Detection and Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Service Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Rigid Service Edge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Flexible Service Delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
New Service Rollout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
About Juniper Networks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table of Figures
Figure 1: Connectivity Blueprint, from the most basic (bottom) to the most detailed (top) . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2: Components, Transport Pseudowires and Regions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3: Intra- and Inter-Region LSPs; BGP-based Hierarchy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Copyright © 2010, Juniper Networks, Inc. 3
WHITE PAPER - Seamless MPLS
Abstract
Just when you thought that MPLS has peaked, that the pace of innovation has slowed, and that MPLS is getting boring,
two promising new developments—namely “MPLS in the access” and “seamless MPLS”—bring fresh excitement to
service provider networks. MPLS in the access is evolutionary, but a necessary prerequisite to seamless MPLS, which
has the potential to revolutionize the life cycle of service offerings.
Introduction
It is hard to overstate the impact that MPLS has had on service provider networks. In half a decade (1999–2004),
MPLS transformed the WAN portion of most service providers. MPLS’s fast-paced deployment can be attributed to
two key qualities: its excellent synergy with IP (an almost universally deployed technology) and its versatility. This
versatility was evidenced by the wide variety of reasons that MPLS was introduced into networks: for traffic engineering
and enhanced quality-of-service (QoS) features; for fast restoration on network failures; for convergence of multiple
networks to a single infrastructure; and for a new service, “BGP/MPLS IP VPNs,” which serves both as a technology for
service provider-based VPNs for enterprise clients and as a technique for compartmentalization of network elements
(see RFC3209, RFC4090, RFC4364, and MPLS Apps).
Over the past half decade, MPLS has made inroads both to the rest of the service provider world as well as to other
parts of service provider networks, such as the metro area network (MAN) and access networks. The timing is
fortuitous, supporting another sweeping change: the migration of TDM-based infrastructure to Ethernet. Ethernet,
while an extremely successful LAN technology, needed help to meet the stringent requirements of service provider
networks—MPLS filled in nicely. MPLS has also progressed functionally, with the emulation of point-to-point
and multipoint-to-multipoint Layer 2 services (RFC4447, RFC4761, and RFC4762), and the addition of multicast
capabilities, both natively in MPLS (RFC4875) and within VPNs (mVPN). These developments are of interest from two
points of view: (a) a carrier-grade infrastructure for the metro network, and (b) a vehicle for offering new services.
This expansion outward from the core, however, has been opportunistic and somewhat haphazard. “MPLS in the
access” asks the question: Why shouldn’t MPLS be used in all access networks in a systematic fashion? This has
several benefits and several challenges. Juniper considers the benefits significant and the challenges solvable. The
following sections contain a high-level architecture for MPLS in the access. “seamless MPLS” takes this one step
further to an analysis that asks what fundamental change would occur if the entire network were based on MPLS. The
result is startling, and offers a new view of MPLS—not just as a network technology, not as a service in itself, or as a
service enabler—but also as a vehicle for flexible service delivery. This last aspect has the potential to dramatically
change the nature of service offering.
MPLS in the Access
As stated previously, MPLS has proven its value in the WAN, so much so that most WANs are built around MPLS. At
the same time, MANs are changing from TDM- and ATM-based networks to ones based on Ethernet. The first question
that arises with such a change is what should the underlying infrastructure for an Ethernet-based metro and access
network be? The success of MPLS in the WAN naturally suggests the use of MPLS here as well. This leads to the next
set of questions. Will the benefits seen in the WAN play out in the metro and access as well? Will MPLS scale to the
required extent? Can MPLS fill this role effectively? What leads to seamless MPLS? What else will make this possible?
We’ll take these questions in order.
Benefits
The idea of using MPLS for access is not new. It is already being done for some applications such as mobile or DSL
backhaul. The benefits of MPLS seen in the WAN are apparent in these applications as well. Thus, the question of how
MPLS will improve metro and access networks is clear. Some standards organizations (such as the IP/MPLS Forum
and the Broadband Forum) are attempting to formalize these approaches. However, these deployments are somewhat
ad hoc. What is being suggested in this paper is the systematic use of MPLS for the entire access and metro network—
whether mobile or fixed, residential or business, copper or fiber. Several service providers are looking at the implications
of doing this.
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