From: Keane, James (James.Keane@agriculture.gov.ie)
Date: Mon Apr 11 2005 - 10:25:25 GMT-3
>If you are given the requirement to
>1) not allow the network 0.0.0.0/0 in any router's routing table,
>
> * you have an nssa area with no-summary on the ABR,
> * your nssa internal routers have naturally occuring 0.0.0.0/0
> default route resulting from the nssa no-summary,
>
>how does one over come this seemingly contradictory scenario?
I suppose you need to understand the difference between
area 14 nssa default-information-originate no-summary
area 14 nssa no-summary
Also
'To control summarization and filtering of type 7 LSAs into type 5 LSAs, use the following command in router configuration mode on the ABR: '
'Router(config-router)# summary address prefix mask [not advertise] [tag tag]
Controls the summarization and filtering during the translation. '
What if you put in a summary address ?
I havent labed this but I'd imagine you need to play with these parameters.
If I recall correcty a default route is generated to replace the routes filtered by the stub, what if you summarise all the routes that are going to be filtered, is a default still needed, is it still generated ?
Some ideas !
If you are really desperate you could attempt to filter out lsa's but its unlikely this is the solution
James
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