IP ROUTING

Command Usage

Before you create a stub or NSSA, first specify the address range for an area using the Network Area Address Configuration screen (page 3-305).

Stubs and NSSAs cannot be used as a transit area, and should therefore be placed at the edge of the routing domain.

A stub or NSSA can have multiple ABRs or exit points. However, all of the exit points and local routers must contain the same external routing data so that the exit point does not need to be determined for each external destination.

Command Attributes

Area ID – Identifier for an area, stub or NSSA.

Area Type – Specifies a normal area, stub area, or not-so-stubby area (NSSA). Area ID 0.0.0.0 is set to the backbone by default. (Default: Normal area)

Default Cost – Cost for the default summary route sent into a stub from an area border router (ABR). (Range: 0-16777215; Default: 1)

-Note that if you set the default cost to “0,” the router will not advertise a default route into the attached stub.

Summary – Makes an ABR send a Type-3 summary link advertisement into a stub. (Default: Summary)

-A stub is designed to save routing table space by blocking Type-4 AS summary LSAs and Type 5 external LSAs. If you use the “NoSummary” option to also block Type-3 summary LSAs that advertise the default route for destinations external to the local area or the AS, the stub will become completely isolated.

Note: This router supports up to 16 total areas (either normal transit areas, stubs, or NSSAs).

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SMC Networks SMC8612XL3 F 1.0.1.3 manual 293, Command Usage

SMC8612XL3 F 1.0.1.3 specifications

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