DXS-3600 Series Layer 3 Managed 10Gigabit Ethernet Switch CLI Reference Guide
901
Parameters
AREA-ID
Specifies the ID of the area to be assigned as an NSSA area.
no-summary
(Optional) Specifies that this function only takes effect when the router
is an ABR.
Default
No NSSA area is defined.
If
no-summary
is not specified, the summary route will be advertised to the NSSA area.
Command Mode
Router Configuration Mode.
Command Default Level
Level: 12.
Usage Guideline
The command
no area AREA-ID nssa
removes all NSSA related settings associated with the area. The
area remains as an NSSA area.
There are no external routes in an OSPF stub area, so routes cannot be redistributed from another
protocol into a stub area.
An NSSA allows external routes to be advertised to the area in the type-7 LSA. These routes are then
leaked into other areas. Although, the external routes from other areas still do not enter the NSSA.
Use the
area nssa
command to simplify administration if connecting a central site using OSPF to a
remote site that is using a different routing protocol. Extend OSPF to cover the remote connection by
defining the area between the central router and the remote router as a NSSA.
For ASBR NSSA redistribution, external routes will only be redistributed to the NSSA area when
redistribution is configured for the associated OSPF process.
The external routes from other areas within the same AS will not be injected to the NSSA area.
If there are multiple default routes generated into the NSSA area, the following priority will be followed:
intra-route > inter-route > external route.
Example
This example shows how to configure the NSSA area.
Switch# configure terminal
Switch(config)# router ospf
Switch(config-router)# area 1 nssa
Switch(config-router)#
75-3 area range
This command is used to summarize OSPF routes at an area border router. Use the
no
command to
remove the defined summarization of routes.
area AREA-ID range NETWORK-PREFIX NETWORK-MASK [advertise | no-advertise]
no area AREA-ID range NETWORK-PREFIX NETWORK-MASK
Parameters
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