HP Intelligent Management Center Licenses - Manual (Page 138)

LDP Label Distribution Protocol. It establishes virtual circuits by establishing point-to-point sessions
between a pair of PEs.
LDP Session LDP sessions are established between LSRs based on TCP connections and are used to exchange
messages for label binding, label releasing, and error notification.
Link Invalid If association lost or RT value change on a VPN link results in the link not belonging to the original
VPN, MVM considers it invalid.
LSP Label Switched Path
LSP A label switched path (LSP) is the path along which packets of a FEC travel through an MPLS
network.
LSR A label switching router (LSR) is a fundamental component on an MPLS network. LSRs support
label distribution and label swapping.
Management VPN Generally, a VPN manages PEs and Ps only. A management VPN, however, is a VPN with
Hub-Spoke networking scheme, and it can manage user-end CEs.
MCE A MCE (Multi-VPN-Instance CE) is a router which has Multiple VPN-Instances, running in an
Intranet.
MPE In an HoPE (hierarchy of PE) architecture, the device connecting an underlayer PE (UPE) and a
superstratum PE (SPE) is called middle-level PE (MPE).
MPLS Multiprotocol Label Switching. MPLS is critical to the implementation of MPLS traffic engineering,
and supports explicit LSP routing. Compared with IP packet forwarding, explicit LSP routing is
easier to manage and maintain.
MPLS TE MPLS Traffic Engineering. MPLS TE combines the MPLS and traffic engineering technologies. By
establishing LSP tunnels along specific paths, it supports reserving resources, so as to make best
utilization of network resources and avoid non-even load distribution. When network resources
are insufficient, MPLS TE allows bandwidth-hungry LSPs and critical user traffic to occupy the
bandwidth for lower priority LSP tunnels. In case an LSP tunnel fails or congestion occurs on a
network node, the path backup and Fast Reroute (FRR) features that MPLS TE provides can reroute
traffic to a backup path for forwarding.
MPLS VPN Multi-Protocol Label Switching Virtual Private Network
MPLS VPN
Configuration
Synchronization The latest VRF configuration and VRF routing information on a PE are obtained, deciding whether
the VRF configuration in MVM has changed.
Non-managed CE A CE device in a VPN. It maps to an actually existing but unmanageable CE device.
NPE Network provider edge device that functions as the network core PE. An NPE resides at the edge
of a VPLS network core domain and provides transparent VPLS transport services between core
networks.
P Provider Router, which is a backbone router on a service provider network and not directly
connected with any CE. It only needs to be equipped with MPLS capability.
PBB Provider Backbone Bridge.
PE Provider edge device that connects one or more CEs to the service provider network, mainly for
access to VPN services. A PE maps and forwards packets between private networks and public
network tunnels. A PE can be a UPE or NPE.
Peer Two LSRs using an LDP session to exchange FEC-label bindings are peers.
PW Pseudo wire, the bidirectional virtual connection between two VSIs. A pseudo wire consists of
two unidirectional virtual circuits (VCs).
RD Route Distinguisher, an address prefix prefixed to a specific IPv4 address, making VPN IPv4
prefixes globally unique.
Region For devices in the same geographical region, a region can be divided into different subregions,
and the subregions can be further divided into subregions. The nested subregions cannot be more
than four levels.
RSVP Resource Reservation Protocol. RSVP is designed for Integrated Service (IntServ). It reserves
resources on each node along a path. RSVP operates at the transport layer but does not participate
in data transmission. It is an Internet control protocol similar to ICMP.
138 Glossary of Terms