Define the NSSA area as NSSA. (on all routers in teh NSSA area; ABR
router will do the magic).
HTH,
Charles
More specifics:
From
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/np1_c
/1cprt1/1cospf.htm#xtocid1066410
Configure OSPF Not So Stubby Area (NSSA)
NSSA area is similar to OSPF stub area. NSSA does not flood Type 5 external
link state advertisements (LSAs) from the core into the area, but it has the
ability of importing AS external routes in a limited fashion within the
area.
NSSA allows importing of Type 7 AS external routes within NSSA area by
redistribution. These Type 7 LSAs are translated into Type 5 LSAs by NSSA
ABR which are flooded throughout the whole routing domain. Summarization and
filtering are supported during the translation.
Use NSSA to simplify administration if you are an Internet service provider
(ISP), or a network administrator that must connect a central site using
OSPF to a remote site that is using a different routing protocol.
Prior to NSSA, the connection between the corporate site border router and
the remote router could not be run as OSPF stub area because routes for the
remote site cannot be redistributed into stub area. A simple protocol like
RIP is usually run and handle the redistribution. This meant maintaining two
routing protocols. With NSSA, you can extend OSPF to cover the remote
connection by defining the area between the corporate router and the remote
router as an NSSA.
In router configuration mode, use the following command to specify area
parameters as needed to configure OSPF NSSA:
Command
Purpose
area area-id nssa [no-redistribution] [default-information-originate]
Define an area to be NSSA.
In router configuration mode on the ABR, use the following command to
control summarization and filtering of Type 7 LSA into Type 5 LSA:
Command
Purpose
summary address prefix mask [not advertise] [tag tag]
(Optional) Control the summarization and filtering during the translation
""Gerry Lian"" <[EMAIL PROTECTED]> wrote in message
000e01c020fe$47fb2fc0$[EMAIL PROTECTED]">news:000e01c020fe$47fb2fc0$[EMAIL PROTECTED]...
> Hi,
> Do you know how to translate NSSA type 7 LSA to Type 5 LSA ?
> NSSA type 7 will not be sent to OSPF backbone unless it can be translated
> from type 7(N1,N2) to type 5(E1,E2) at ABR.
> I don't know what command can do that.
>
> Thanks a lot
>
> Gerry Lian
>
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