Table 50: MPLS Terms and Acronyms (continued)
DefinitionTerm
Label-switched path—The path traversed by a packet that is routed
by MPLS. Some LSPs act as tunnels.
LSP
A priority that indicates the importance of one LSP relative to another
LSP. LSPs having higher priorities can preempt LSPs having lower
priorities. Priorities range from 0 through 7 in order of decreasing
priority.
LSP priority level
Label-only-inferred-PSC LSP. The label value, and possibly the
EXP-bits, are used to determine the per-hop behavior applied to the
packet.
L-LSP
Label-switching router—An MPLS node that can forward layer 3
packets based on their labels
LSR
Multiprotocol Label Switching—Set of techniques enabling
forwarding of traffic using layer 2 and layer 3 information
MPLS
MPLS node that connects an MPLS domain with a node outside the
domain that either does not run MPLS or is in a different domain
MPLS edge node
MPLS edge node in the role of handling traffic as it leaves an MPLS
domain
MPLS egress node
MPLS edge node in the role of handling traffic as it enters an MPLS
domain
MPLS ingress node
Label carried in a packet header that represents a packet’s forwarding
equivalence class
MPLS label
A router running MPLS. An MPLS node is aware of MPLS control
protocols, operates one or more L3 routing protocols, and is capable
of forwarding packets based on labels. Optionally, an MPLS node
can be capable of forwarding native L3 packets.
MPLS node
The series of LSRs and links that form the path from an ingress LSR
to all of its egress LSRs. Each tunnel is uniquely identified by a session
object.
Point-to-multipoint
tunnel
An RSVP-TE LSP with a single ingress LSR and one or more egress
LSRs. Incoming data is replicated at the branch nodes.
Point-to-multipoint LSP
PE—An LER at the edge of a service provider core that provides
ingress to or egress from a VPN
Provider edge router
P—An LSR within a service provider core that carries traffic for a VPNProvider core router
Resource Reservation Protocol; E Series routers do not support RSVPRSVP
213Copyright © 2010, Juniper Networks, Inc.
Chapter 3: MPLS Overview
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