Motorola BSR 2000, Configuration And Management Manual

Page: 491 / 650

526360-001-00 Rev. B MGBI 11-1
11
Configuring OSPF
Overview
OSPF supports IP sub-networking and tagging of externally derived routing
information. OSPF also allows packet authentication and uses IP multicast when
sending and receiving packets. It advertises the states of its local network links and
runs within a single Autonomous System (AS) to determine optimum routes. Each
participating OSPF router within the AS has an identical database of the AS topology.
OSPF uses the database information to calculate a routing table by constructing a
shortest-path tree. It recognizes AS topology changes and calculates new, loop-free
routes.
OSPF requires coordination among many internal routers, area border routers
(ABRs), and autonomous system boundary routers (ASBRs). Basic configuration of
OSPF-based routers or access servers uses all default parameter values, no
authentication, and interfaces assigned to areas. If you customize your environment,
you must ensure the coordinated configuration of all routers.
To configure OSPF, complete the tasks in the following sections. You must perform
the basic tasks, which include enabling OSPF and defining an OSPF area and area ID.
The advanced tasks are optional, but include some parameters that you may choose to
change. If a parameter default is satisfactory, you can ignore its associated task.
Use the following section to implement OSPF on the BSR 2000™:
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Enabling OSPF