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stub (OSPF Area)
Function
The stub command sets an area to the stub area.
The undo stub command cancels the settings.
By default, no area is set to the stub area.
Parameters
| Parameter | Description | Value |
|---|---|---|
| no-summary | Forbids the ABR to send Summary LSAs to the stub area. | - |
| default-route-advertise | Enables the ABR to generate default Type 3 LSAs and advertise them to the stub area. | - |
| backbone-peer-ignore | Prevents the ABR from checking the neighbor status when the ABR generates default Type 3 LSAs and advertises them to the stub area. Specifically, the ABR generates default Type 3 LSAs and advertises them to the stub area if an interface that is Up exist in the backbone area. | - |
Usage Guidelines
There are two configuration commands for stub area: stub and default-cost (OSPF Area). If you want to configure one area as the stub area, you must configure all devices in the area by the stub command.
The default-cost (OSPF Area) command takes effect only when it is configured on an ABR. The command is used to specify the cost of the default summary route transmitted by the ABR to the stub area.
On an ABR, you can configure the no-summary of the stub command to prevent Type 3 LSA from entering the stub area that the ABR connects to.
The backbone area cannot be configured as a stub area.
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