From: Peter van Oene (pvo@xxxxxxxxxxxx)
Date: Wed Jan 09 2002 - 11:48:19 GMT-3
comments inline
At 10:54 PM 1/8/2002 +0000, omar guarisco wrote:
>it's not possible to avoid conversion Type7 to Type5 configure the area
>NSSA as totally stub using the command on ABR
Sure it is. Although technically, what happens is likely more of a
filtering of type 5 announcements vs an interpretation of P bit settings
leading to a decision not to convert type 7's to 5's.
>area 1 nssa no-summary
>
>so that a default route using LSA type 3 from the ABR
Making the area totally stubby removes the inter area routing information
(Type 3 LSAs) from the area. It has nothing to do with externals.
>Another question: How it could be that on a NSSA area a router is ASBR is
>and also an ABR ??? Moreover that NSSA area won't support virual links
I take it you didn't check the link I provided which pictorially describes
this exact situation. The router is an ABR that has an interface in the
backbone, and interface in an NSSA area, and happens to redistribute some
routing information. In this case, it wishes not to inject that routing
information into the NSSA area, but only into the rest of the OSPF
domain. I'm completely unaware of the relevance of virtual links in this
scenario.
Pete
>Thnks for helps
>Omar
>
>
>
>
>>From: Peter van Oene <pvo@usermail.com>
>>Reply-To: Peter van Oene <pvo@usermail.com>
>>To: "'ccielab@groupstudy.com'" <ccielab@groupstudy.com>
>>Subject: RE: NSSA
>>Date: Tue, 08 Jan 2002 17:33:24 -0500
>>
>>The below describes the situation where an ASBR happens to be an NSSA ABR
>>at the same time. In this case, the desire is to bring externals into the
>>network on that router, yet not leak them into the NSSA area. The
>>no-redistribution command accomplishes that nicely.
>>
>>However, I think the original poster was looking more for how to restrict
>>the Type 7 to Type 5 conversion that the NSSA ABR will perform by
>>default. In this case, adding a summary address with the not-advertise
>>option for the prefixes you wish to restrict accomplishes this. The
>>following link is quite helpful in explaining both of these situations in
>>some detail.
>>
>>http://www.cisco.com/warp/public/104/nssa.html#2c
>>
>>Pete
>>
>>
>>
>>At 01:30 PM 1/8/2002 -0800, Jeongwoo Park wrote:
>>>Make ASBR into ABR by doing
>>>router ospf 1
>>> area 1 nssa no-redistribution
>>>This way, there will be no type 7 generated
>>>
>>>-----Original Message-----
>>>From: Christian C. Aguillo [mailto:chris_aguillo@alfalak.com]
>>>Sent: Tuesday, January 08, 2002 4:46 AM
>>>To: GroupStudy
>>>Subject: NSSA
>>>
>>>Hi Friends,
>>>
>>>How can I inject external routes to OSPF via NSSA ASBR wihtout conversion of
>>>the LSA-7 to LSA-5.
>>>
>>>Thanks and cheers....
>>>
>>>
>>>
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