User Manual

Glossary
M40 Internet Router Hardware Guide
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J
jitter Small random variation introduced into the value of a timer to prevent multiple timer
expirations from becoming synchronized.
K
kernel forwarding table See forwarding table.
L
label-switched path
(LSP)
Sequence of routers that cooperatively perform MPLS operations for a packet stream. The
first router in an LSP is called the ingress router, and the last router in the path is called the
egress router. An LSP is a point-to-point, half-duplex connection from the ingress router to the
egress router. (The ingress and egress routers cannot be the same router.)
label switching See MPLS.
label-switching router See LSR.
link Communication path between two neighbors. A link is up when communication is possible
between the two end points.
link-state PDU (LSP) Packets that contain information about the state of adjacencies to neighboring systems.
LSP See label-switched path (LSP) and link-state PDU (LSP).
LSR Label-switching router. A router on which MPLS and RSVP are enabled and is thus capable of
processing label-switched packets.
M
mask See subnet mask.
MBone Internet multicast backbone. An interconnected set of subnetworks and routers that support
the delivery of IP multicast traffic. The MBone is a virtual network that is layered on top of
sections of the physical Internet.
MED Multiple exit discriminator. Optional BGP path attribute consisting of a metric value that is
used to determine the exit point to a destination when all other factors in determining the
exit point are equal.
mesh Network topology in which devices are organized in a manageable, segmented manner with
many, often redundant, interconnections between network nodes.
MIB Management Information Base. Definition of an object that can be managed by SNMP.
MPLS Multiprotocol Label Switching. Mechanism for engineering network traffic patterns that
functions by assigning to network packets short labels that describe how to forward them
through the network. Also called label switching. See also traffic engineering.
MTBF Mean time between failure. Measure of hardware component reliability.
MTU Maximum transfer unit. Limit on packet size for a network.
multicast Operation of sending network traffic from one network node to multiple network nodes.
Multiprotocol Label
Switching
See MPLS.