IP ROUTING

CLI - This example configures a virtual link from the ABR adjacent to area 0.0.0.4, through a transit area to the neighbor router 10.1.1.252 at the other end of the link which is adjacent to the backbone.

Console(config-router)#area 0.0.0.0 virtual-link 10.1.1.2523-160Console(config-router)#

Configuring Network Area Addresses

OSPF protocol broadcast messages (i.e., Link State Advertisements or LSAs) are restricted by area to limit their impact on network performance. A large network should be split up into separate OSPF areas to increase network stability, and to reduce protocol traffic by summarizing routing information into more compact messages. Each router in an area shares the same view of the network topology, including area links, route summaries for directly connected areas, and external links to other areas.

Command Usage

•Use the Network Area Address Configuration page to specify an Area ID and the corresponding network address range. Each area identifies a logical group of OSPF routers that actively exchange LSAs to ensure that they share an identical view of the network topology.

•Each area must be connected to a backbone area. This area passes routing information between other areas in the autonomous system. The default value 0.0.0.0 is used as the Area ID for the backbone. All routers must be connected to the backbone, either directly, or through a virtual link if a direct physical connection is not possible.

•An area initially configured via the Network Area Address Configuration page is set as a normal area (or transit area) by default. A normal area can send and receive external Link State Advertisements (LSAs). If necessary, you can use the Area Configuration page to configure an area as a stubby area that cannot send or receive external LSAs, or a not-so-stubby area (NSSA) that can import external route information into its area (page 3-291).

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SMC Networks SMC8612XL3 F 1.0.1.3 manual 305, Configuring Network Area Addresses
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SMC8612XL3 F 1.0.1.3 specifications

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