Lucent Technologies PortMaster - Manual (Page 312)

Glossary
Glossary-2 PortMaster Configuration Guide
aggregation
The process of combining multiple prefixes from one or several routes so that a single
prefix and route can be advertised. Route aggregation reduces the amount of information
that a device running BGP must store and exchange with its BGP peers. See also
summarization.
Annex-D
The ANSI T1.617 Frame Relay Annex-D version of the Local Management Interface
(LMI) protocol. The Annex-D protocol has a more robust feature set than the proprietary
Cisco/Stratacom LMI, but was developed later. Recent versions of the PortMaster
software support either type of LMI. Earlier versions supported only the Cisco/Stratacom
version. See also LMI.
area
In OSPF, a contiguous collection of networks and hosts. Each area runs a separate copy of
the shortest-path-first (SPF) algorithm and has its own topological database.
area border router
In OSPF, a router that attaches to the backbone and one other area. An area border router
runs separate copies of the shortest-path-first (SPF) algorithm for each area it attaches to.
Area border routers condense the topological information of their attached areas and
distribute it over the backbone to the other areas.
ARP
Address Resolution Protocol. A protocol that discovers the unique physical hardware
address of a node or a LAN from its IP address. When an ARP request is sent to the
network, naming the IP address, the machine with that IP address returns its physical
address so that it can receive the transmission.
ASCII
American Standard Code for Information Interchange. A standard 8-bit code commonly
used by computers and communications equipment.
autonomous system
A collection of routers under the control of a single technical administration, using one or
more Interior Gateway Protocols (IGPs)—such as OSPF—to route packets within itself,
and an Exterior Gateway Protocol (EGP)—such as BGP—to route packets to other
autonomous systems. An autonomous system typically uses a common BGP policy and
always presents a consistent view of network reachability to other autonomous systems.