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1) available bit rate
A quality
of service (QoS) class defined by the ATM Forum for ATM networks. ABR is used
for connections that do not require timing relationships between source and
destination. ABR provides no guarantees in terms of cell loss or delay, and
provides only best-effort service. Traffic sources adjust their transmission
rate in response to information they receive which describes the status of the
network and its capability to successfully deliver data. Compare with CBR,
UBR, and VBR. 2) 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 maintain routing tables which describe both the backbone topology
and the topology of the other areas.
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