Extreme Networks ExtremeWare 7.7, Command Reference Manual

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1810 ExtremeWare 7.7 Command Reference Guide
IGP Commands
configure ospf area nssa stub-default-cost
configure ospf area <area identifier> nssa [summary | nosummary]
stub-default-cost <cost> {translate}
Description
Configures an OSPF area as an NSSA.
Syntax Description
Default
N/A.
Usage Guidelines
NSSAs are similar to the existing OSPF stub area configuration option, but have the following two
additional capabilities:
• 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 ExtremeWare 4.0.
This command was added to the Summit “ e ” series of switches in ExtremeWare 7.1e.
Platform Availability
This command is available on all platforms.
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.