Re: Type-4 LSA and NSSA

@narbuik that includes backbone area 0?
Thanking You

Yours Sincerely

Divin Mathew John
divinjohn_at_gmail.com
divin_at_dide3d.com
http://www.dide3d.com
+91 9945430983
+91 9846697191
+974 5008916
PGP PUBLIC KEY BLOCK @ http://www.dide3d.com/divin_Public_PGP_key.txt
Sent from Bengaluru, Karnataka, India

On Sat, May 9, 2009 at 1:02 PM, Narbik Kocharians <narbikk_at_gmail.com> wrote:
> 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
> CCSI#30832, CCIE# 12410 (R&S, SP, Security)
> www.MicronicsTraining.com
> www.Net-Workbooks.com
> Sr. Technical Instructor
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Sat May 09 2009 - 13:06:08 ART