Cisco Cisco IOS Software Release 12.2(27)SBC
MPLS Traffic Engineering—Configurable Path Calculation Metric for Tunnels
Glossary
14
Cisco IOS Release: Multiple releases (see the Feature History table)
Glossary
Cisco Express Forwarding—An advanced Layer 3 IP switching technology. CEF optimizes network
performance and scalability for networks that have large and dynamic traffic patterns, such as the
Internet, as well as for networks characterized by intensive Web-based applications or interactive
sessions. CEF uses a Forwarding Information Base (FIB) to make IP destination prefix-based switching
decisions. The FIB is conceptually similar to a routing table or information base. When routing or
topology changes occur in the network, the IP routing table is updated, and those changes are reflected
in the FIB. The FIB maintains next-hop address information based on the information in the IP routing
table.
performance and scalability for networks that have large and dynamic traffic patterns, such as the
Internet, as well as for networks characterized by intensive Web-based applications or interactive
sessions. CEF uses a Forwarding Information Base (FIB) to make IP destination prefix-based switching
decisions. The FIB is conceptually similar to a routing table or information base. When routing or
topology changes occur in the network, the IP routing table is updated, and those changes are reflected
in the FIB. The FIB maintains next-hop address information based on the information in the IP routing
table.
IGP—Internet protocol used to exchange routing information within an autonomous system. Examples
of common Internet IGPs include OSPF and RIP.
of common Internet IGPs include OSPF and RIP.
Interior Gateway Protocol—See IGP.
metric—A metric is the method by which a routing algorithm determines that one route is better than
another. The information is stored in routing tables. Metrics include bandwidth, communication cost,
delay, hop count, load, and reliability.
another. The information is stored in routing tables. Metrics include bandwidth, communication cost,
delay, hop count, load, and reliability.
MPLS—Multiprotocol Label Switching. A method for forwarding packets (frames) through a network.
It enables routers at the edge of a network to apply labels to packets (frames). ATM switches or existing
routers in the network core can switch packets according to the labels with minimal lookup overhead.
It enables routers at the edge of a network to apply labels to packets (frames). ATM switches or existing
routers in the network core can switch packets according to the labels with minimal lookup overhead.
Multiprotocol Label Switching—See MPLS.
Open Shortest Path First—See OSPF.
OSPF—Link-state hierarchical IGP routing algorithm proposed as a successor to RIP in the Internet
community. OSPF features include least-cost routing, multipath routing, and load balancing.
community. OSPF features include least-cost routing, multipath routing, and load balancing.
traffic engineering—The techniques and processes used to cause routed traffic to travel through the
network on a path other than the one that would have been chosen if standard routing methods had been
used.
network on a path other than the one that would have been chosen if standard routing methods had been
used.
Note
See
for terms not included in this glossary.
Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and
figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and
coincidental.
figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and
coincidental.
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