| Exam 642-883 | Question id=3418 | OSPFv2 and OSPFv3 Routing in Service Provider Environments |
Refer to the OSPF command exhibit.
RP/0/RSP0/CPU0:P1(config-ospf)#area 1 stub no-summary
Which effect does the no-summary command option have?
| A. |
It will cause area 1 to be able to receive non-summarized inter-area routes. | |
| B. |
It will cause area 1 to not receive any inter-area routes and will use a default route to reach networks in other areas. | |
| C. |
It will cause area 1 to not receive any external routes and will use a default route to reach the external networks. | |
| D. |
It will convert the NSSA area into a NSSA totally stubby area. | |
| E. |
It will convert the stubby area into a NSSA. | |
| F. |
It will disable OSPF auto-summary. |
To define an area as a stub area, use the area stub command in router configuration mode. To disable this function, use the no form of this command.
area area-id stub [no-summary]
no area area-id stub
no area area-id
Syntax Description:
area-id - Identifier for the stub area; either a decimal value or an IP address.
no-summary - (Optional) Prevents an ABR from sending summary link advertisements into the stub area.
You must configure the area stub command on all routers and access servers in the stub area. Use the area router configuration command with the default-cost option to specify the cost of a default internal router sent into a stub area by an area border router.
There are two stub 3re3 router configuration commands: the stub and default-cost options of the area router configuration command. In all routers attached to the stub area, the area should be configured as a stub area using the stub option of the area command. Use the default-cost option only on an ABR attached to the stub area. The default-cost option provides the metric for the summary default route generated by the area border router into the stub area
To further reduce the number of link state advertisements (LSAs) sent into a stub area, you can configure no-summary on the ABR to prevent it from sending summary LSAs (LSAtype 3) into the stub area.