Re: Type-4 LSA and NSSA

Good job, But the ABR of that area will generate LSA type 4 into other
areas. You guys should lab this up and do a simple show command.

On Sat, May 9, 2009 at 12:28 AM, Mike Leske <mike.leske_at_googlemail.com>wrote:

> Thanks Scott and Narbik for confirming my thoughts.
>
> I think I finally found an "official" confirmation for that.
>
> RFC 1587 The OSPF NSSA Option states on page 5:
> "Type-7 LSAs are only flooded within the NSSA. The flooding of type-7 LSAs
> follow the same rules as the flooding of type 1-4 LSAs."
> But it describes at no point, that Type-4 LSAs will not be flooded into
> NSSAs.
>
>
> However, RFC 3101 The OSPF Not-So-Stubby Area (NSSA) Option, which
> obsoletes RFC 1587, clearly states on page 5:
> "Since Type-5 AS-external-LSAs are not flooded into NSSAs, NSSA border
> routers should not originate Type-4 summary-LSAs into their NSSAs."
>
>
> Cheers
> Mike
>
>
> 2009/5/9 Scott Morris <smorris_at_internetworkexpert.com>
>
>> Type 4's are used for next hop reachability to get to the Type 5 LSAs
>> (ASBR). If you have no Type 5's, you have zero need for a Type 4 LSA. :)
>>
>> So I'd suggest that someone messed up in the book?
>>
>> *Scott Morris*, CCIE*x4* (R&S/ISP-Dial/Security/Service Provider) #4713
>>
>
>
>

-- 
Narbik Kocharians
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