message-pacing —The former name of the rate limiting feature.
MPLS —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.
OSPF —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.
router —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 information.
RSVP —Resource Reservation Protocol. A protocol that supports the reservation of resources across an IP
network.
scalability —An indicator showing how quickly some measure of resource usage increases as a network gets
larger.
TLV —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.
topology —The physical arrangement of network nodes and media within an enterprise networking structure.
TE (traffic engineering) —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.
traffic engineering tunnel —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.
MPLS Traffic Engineering Path Calculation and Setup Configuration Guide, Cisco IOS XE Release 3S (Cisco
ASR 920 Series)
10
MPLS Traffic Engineering – Bundled Interface Support
Glossary
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