Juniper BGP - CONFIGURATION GUIDE V 11.1.X

■ LDP-IGP Synchronization on page 249
■ Determining Peer Reachability with RSVP-TE Hello Messages on page 251
■ RSVP-TE Graceful Restart on page 254
■ RSVP-TE Hellos Based on Node IDs on page 256
■ BFD Protocol and RSVP-TE on page 257
■ Tunneling Model for Differentiated Services Overview on page 258
■ EXP Bits for Differentiated Services Overview on page 259
■ Point-to-Multipoint LSPs Overview on page 262
■ Point-to-Multipoint LSPs Configuration on page 265
MPLS Overview
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.
Conventions for MPLS Topics
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 22 on page 202 lists the terms and some of their variant spellings.
Table 22: Conventions for MPLS Terms
In RFCs and Other SourcesIn This Chapter
ACKAckack
–Bundlebundle
202 ■ MPLS Overview
JUNOSe 11.1.x BGP and MPLS Configuration Guide