User`s guide

PassFinder AP2520 VoIP Router/Gateway Operation Manual Version 1.10 / Mar. 2002
AddPac Technology Co., Ltd. -
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4.6.3. OSPF Configuration
Open Shortest Path First (OSPF) is a kind of Interior Gateway Protocol (IGP) that
has been developed by the OSPF working group of the Internet Engineering
Task Force (IETF,) and it uses the link state algorithm. Since OSPF has been
engineered to well support the IP network, OSPF supports IP subnet and
toggling of exchanged routing information. Also, OSPF supports packet
authentication with the neighboring router, and uses IP multicast when
exchanging routing information packet.
The PassFinder AP2520 router supports OSPF version 2 specifications that are
described in the Internet RFC 1583. The following is some of major functions
implemented in the PassFinder AP2520 router by the OSPF.
z Stub Area: Defines the stub area.
z Route Redistribution: Acquires routing information by IP routing protocol
and redistributes routing information to another routing protocol.
z Authentication: Supports plain text and MD5 authentication between
neighboring routers within the same area.
z Routing Interface Parameter: Enables the manager to set interface
parameters – interface output cost, retransmission interval, interface
transmit delay, router priority and authentication key.
z Area Boarder Router (ABR): If the router covers more than two OSPF areas,
the PassFinder AP2520 router functions as an area boarder router.
There are several areas including the backbone area in one routing domain of
the OSPF network.
z Routing Domain: The routing domain means an area that performs routing
processing with single routing protocol. If a network uses separate routing
protocol, OSPF considers this network as an outside network. One OSPF
Information