Hirschmann RS20 Reference Manual page 206

Glossary
rights to system objects (such as file
directories and/or files).
ACL. See "Access Control List" on
page 205.
Address Resolution Protocol. An
Internet Protocol that dynamically
maps Internet addresses to physical
(hardware) addresses on a LAN.
Advanced Network Device Layer/
Software. Hirschmann term for the
Device Driver level.
Aging. When an entry for a node is
added to the lookup table of a
switch, it is given a timestamp. Each
time a packet is received from a
node, the timestamp is updated. The
switch has a user-configurable timer
that erases the entry after a certain
length of time with no activity from
that node.
API. See "Application Programming
Interface" on page 206.
Application Programming
Interface. An API is an interface
used by an programmer to interface
with functions provided by an
application.
Area Border Router. A router
located on the border of one or more
OSPF areas that connects those
areas to the backbone network.
ABRs are considered members of
both the OSPF backbone and the
attached areas. They therefore
maintain routing tables describing
both the backbone topology and the
CLI L2B
Release 4.0 11/07
topology of the other areas. (Cisco
Systems Inc.)
ARP. See "Address Resolution
Protocol" on page 206.
ASAM. See "ATM Subscriber
Access Multiplexer" on page 206.
ASBR. See "Autonomous System
Boundary Router" on page 206.
ATM Subscriber Access
Multiplexer. A telephone central
office multiplexer that supports SDL
ports over a wide range of network
interfaces. An ASAM sends and
receives subscriber data (often
Internet services) over existing
copper telephone lines,
concentrating all traffic onto a single
high-speed trunk for transport to the
Internet or the enterprise intranet.
This device is similar to a DSLAM
(different manufacturers use
different terms for similar devices).
(Cisco Systems Inc.)
Autonomous System Boundary
Router. ABR located between an
OSPF autonomous system and a
non-OSPF network. ASBRs run both
OSPF and another routing protocol,
such as RIP. ASBRs must reside in
a non-stub OSPF area. See also
ABR, non-stub area, and OSPF.
(Cisco Systems Inc.)
AVL tree. Binary tree having the
property that for any node in the
tree, the difference in height
between the left and right subtrees
of that node is no more than 1.
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