LevelOne GTL-2691 - Manual (Page 1493)

C HAPTER 49 | IP Routing Commands
Open Shortest Path First (OSPFv2)
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network area This command defines an OSPF area and the interfaces that operate within
this area. Use the no form to disable OSPF for a specified interface.
S YNTAX
[no] network ip-address netmask area area-id
ip-address - Address of the interfaces to add to the area.
netmask - Network mask of the address range to add to the area.
area-id - Area to which the specified address or range is assigned.
An OSPF area identifies a group of routers that share common
routing information. The area ID can be in the form of an IPv4
address or as a four octet unsigned integer ranging from
0-4294967295.
C OMMAND M ODE
Router Configuration
D EFAULT S ETTING
Disabled
C OMMAND U SAGE
◆ An area ID uniquely defines an OSPF broadcast area. The area ID
0.0.0.0 indicates the OSPF backbone for an autonomous system. Each
router must be connected to the backbone via a direct connection or a
virtual link.
◆ Set the area ID to the same value for all routers on a network segment
using the network mask to add one or more interfaces to an area.
◆ If an address range is overlapped in subsequent network area
commands, the router will use the network area with the address range
that most closely matches the interface address. Also, note that if a
more specific address range is removed from an area, the interface
belonging to that range may still remain active if a less specific address
range covering that area has been specified.
E XAMPLE
This example creates the backbone 0.0.0.0 covering class B addresses
10.1.x.x, and a normal transit area 10.2.9.0 covering the class C addresses
10.2.9.x.
Console(config-router)#network 10.1.0.0 255.255.0.0 area 0.0.0.0
Console(config-router)#network 10.2.9.0 255.255.255.0 area 10.1.0.0
Console(config-router)#