interface—Generic terms to represent port-channel, multilink, and
—A means for accelerating the forwarding of packets within a
router, by storing route lookup information in several data structures instead
of in a route cache.
—Connectionless Network Service. The Open Systems Interconnection
(OSI) network layer service that does not require a circuit to be established
before data is transmitted. CLNS routes messages to their destination
independently of any other messages.
—Constrained Shortest Path First. A routing protocol that
calculates the shortest path based on a set of constraints, such as a minimum
bandwidth requirement, maximum number of nodes, or nodes to include or exclude.
—A large and diverse network connecting most major points in a
company or other organization.
—The endpoint of a broadband network. All stations send toward
the headend; the headend then sends toward the destination stations.
—Interior Gateway Protocol. An Internet protocol used to exchange
routing information within an autonomous system. Examples of common Internet
IGPs include Interior Gateway Routing protocol (IGRP), Open Shortest Path First
(OSPF), and Routing Information Protocol (RIP).
—A network connection.
—Intermediate System to Intermediate System. OSI link-state
hierarchical routing protocol based on DECnet Phase V routing, where ISs
(routers) exchange routing information based on a single metric, to determine
the network topology.
LDN— Link Down Notification.
—Label-Switched Path. A sequence of hops (R0...Rn) in
which a packet travels from R0 to Rn through label switching mechanisms. A
label-switched path can be chosen dynamically, based on normal routing
mechanisms, or through configuration.
links—Individual interfaces that are grouped into a bundled
—The former name of the rate limiting feature.
—Formerly known as tag switching, Multiprotocol Label Switching
is a method for directing packets primarily through Layer 2 switching rather
than Layer 3 routing. In MPLS, packets are assigned short fixed-length labels
at the ingress to an MPLS cloud by using the concept of forwarding equivalence
classes. Within the MPLS domain, the labels are used to make forwarding
decisions mostly without recourse to the original packet headers.
—Open Shortest Path First. A link-state, hierarchical Interior
Gateway Protocol (IGP) routing protocol. derived from the Intermediate
System-Intermediate System (IS-IS) protocol. OSPF features are least-cost
routing, multipath routing, and load balancing.
—A network layer device that uses one or more metrics to
determine the optimal path along which network traffic should be forwarded.
Routers forward packets from one network to another based on network layer
—Resource Reservation Protocol. A protocol that supports the
reservation of resources across an IP network.
—An indicator showing how quickly some measure of resource usage
increases as a network gets larger.
—type, length, value. TLV objects are used in data communication
to provide optional information. The type field indicates the type of items in
the value field. The length field indicates the length of the value field. The
value field is the data portion of the packet.
—The physical arrangement of network nodes and media within an
enterprise networking structure.
—Techniques and processes that cause routed traffic to travel
through the network on a path other than the one that would have been chosen if
standard routing methods were used.
—A label-switched tunnel that is used for traffic engineering.
Such a tunnel is set up through means other than normal Layer 3 routing; it is
used to direct traffic over a path different from the one that Layer 3 routing
would cause the tunnel to take.