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JunosE 11.2.x BGP and MPLS Configuration Guide
MPLS Overview
Related Topics
Terminology for MPLS Topics
210
Tracking Resources for MPLS Traffic Engineering Overview on page 253
Topology-Driven LSPs Overview on page 255
LDP Graceful Restart Overview on page 256
LDP-IGP Synchronization Overview on page 258
Use of RSVP-TE Hello Messages to Determine Peer Reachability on page 260
RSVP-TE Graceful Restart Overview on page 263
RSVP-TE Hellos Based on Node IDs Overview on page 265
BFD Protocol and RSVP-TE Overview on page 266
Tunneling Model for Differentiated Services Overview on page 267
EXP Bits for Differentiated Services Overview on page 268
Point-to-Multipoint LSPs Overview on page 271
In conventional IP routing, as a packet traverses from one router to the next through a
network, each router analyzes the packet's header and performs a network layer routing
table lookup to choose the next hop for the packet. In conventional IP forwarding, the
router looks for the address in its forwarding table with the longest match (best match)
for the packet's destination address. All packets forwarded to this longest match are
considered to be in the same forwarding equivalence class (FEC).
MPLS is a hybrid protocol that integrates network layer routing with label switching to
provide a layer 3 network with traffic management capability. MPLS provides
traffic-engineering capabilities that make effective use of network resources while
maintaining high bandwidth and stability. MPLS enables service providers to provide
their customers with the best service available given the provider's resources, with or
without traffic engineering. MPLS is the foundation for layer 3 and layer 2 VPNs.
The two basic components of MPLS are label distribution and data mapping.
Label distribution is the set of actions MPLS performs to establish and maintain a
label-switched path (LSP), also known as an MPLS tunnel.
Data mapping is the process of getting data packets onto an established LSP.
MPLS Terms and Acronyms on page 212
Terminology for MPLS Topics on page 210
Certain terms used with MPLS, such as the names of messages, are often expressed in
the RFCs and other sources either with initial uppercase letters or all uppercase letters.
For improved readability, those terms are represented in lowercase in this chapter. Table
49 on page 211 lists the terms and some of their variant spellings.
Copyright © 2010, Juniper Networks, Inc.
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