configure ospf area nssa stub-default-cost
Description
Configures an OSPF area as an NSSA.
Syntax Description
area-identifier | Specifies an OSPF area. |
summary | Specifies that type-3 can be propagated into the area. |
nosummary | Specifies that type-3 cannot be propagated into the area. |
cost | Specifies a cost metric. |
translate | Specifies whether type-7 LSAs are translated into type-5 LSAs. |
Default
N/A.
Usage Guidelines
- External routes originating from an ASBR connected to the NSSA can be advertised within the NSSA.
- External routes originating from the NSSA can be propagated to other areas, including the backbone area, if translated to type 5 LSAs.
When configuring an OSPF area as an NSSA, the translate option should only be used on NSSA border routers, where translation is to be enforced. If translate is not used on any NSSA border router in a NSSA, one of the ABRs for that NSSA is elected to perform translation (as indicated in the NSSA specification). The option should not be used on NSSA internal routers. Doing so inhibits correct operation of the election algorithm.
Example
The following command configures an OSPF area as an NSSA:
configure ospf area 10.1.1.0 nssa summary stub-default-cost 10 translate
History
This command was first available in ExtremeXOS 10.1.
Platform Availability
This command is available on platforms with an Advanced Edge or Base license, or higher, as described in the ExtremeXOS 32.2 Feature License Requirements document.