Re: LSA Type 4 again

Shawn,

If the area that that has the ASBR happens to be a normal area, in that
case, the ASBR is the one that generates type 5 LSAs, and YES, the ABR will
inject type 4 into area 0, but NOT if the area that has the ASBR happens to
be an NSSA.

On Sun, Sep 6, 2009 at 11:28 AM, Shawn Zandi <szmetal_at_gmail.com> wrote:

> Here:
>
> http://books.google.com/books?id=8ZAQR-_TJJcC&pg=PA364&lpg=PA364&dq=juniper+abr+type+4&source=bl&ots=atDHxpQSZt&sig=a_2BG2ioWtqAigxn2GJYQ0w4C3c&hl=en&ei=Cf6jSq7RLMbajQeYieGzDg&sa=X&oi=book_result&ct=result&resnum=1#v=onepage&q=&f=false
>
> LSA type 4 in Area 0.0.0.0
> check the show ospf database at next page
>
>
>
>
> On Sun, Sep 6, 2009 at 10:18 PM, Narbik Kocharians <narbikk_at_gmail.com>wrote:
>
>> Rick
>>
>> Always look at it from the perspective of the router that originated LSA
>> type 5s, in a NSSA the ASBR originates type 7, but the ABR receives type
>> 7s
>> and originates type 5s, therefore, area 0 will NOT see LSA type 4s, but if
>> area 0 was connected to another area, that third area will receive type
>> 4s.
>> I think of the ABR (The one that connects the NSSA to area 0) as a
>> pseudo-ASBR. BTW i did not say that this will be explained in the same
>> manner in the RFC, just the way i think of that ABR.
>> On Sun, Sep 6, 2009 at 11:13 AM, Rick Mur <rmur_at_ipexpert.com> wrote:
>>
>> > Wow I think this is the first time I detect an error in text from Jeff
>> > Doyle, damn! he is human after all :-P
>> >
>> > --
>> >
>> > Rick Mur
>> > CCIE2 #21946 (R&S, Service provider)
>> > Sr. Support Engineer -- IPexpert, Inc.
>> >
>> > Sent from my iPhone
>> >
>> > On 6 sep 2009, at 18:26, Narbik Kocharians <narbikk_at_gmail.com> wrote:
>> >
>> > LSA type 4 WILL NOT be permitted in any stub areas, as a matter of
>> fact
>> > it won't even be in the area 0, if you have area 0 and a NSSA area, the
>> only
>> > time you will see LSA type 4s is if you have another area (Non-zero area
>> )
>> > connected to area 0.
>> >
>> >
>> > Therefore, i agree with Scott.
>> >
>> > On Sun, Sep 6, 2009 at 8:46 AM, Rick Mur <rmur_at_ipexpert.com> wrote:
>> >
>> >> That's a pretty clear explanation :-)
>> >>
>> >> --
>> >>
>> >> Rick Mur
>> >> CCIE2 #21946 (R&S, Service provider)
>> >> Sr. Support Engineer -- IPexpert, Inc.
>> >>
>> >> Sent from my iPhone
>> >>
>> >>
>> >> On 6 sep 2009, at 17:20, Scott Morris <swm_at_emanon.com> wrote:
>> >>
>> >> "Allowed" and "will exist" are two different things. I'll let Jeff
>> run
>> >>> with the idea that they're permitted in NSSA areas 'cause I like Jeff.
>> >>> However, I will guarantee that they will not exist in NSSA areas. :)
>> >>>
>> >>> So call it whatever you want!
>> >>>
>> >>>
>> >>>
>> >>>
>> >>> *Scott Morris*, CCIE/x4/ (R&S/ISP-Dial/Security/Service Provider)
>> #4713,
>> >>>
>> >>> JNCIE-M #153, JNCIS-ER, CISSP, et al.
>> >>>
>> >>> CCSI #21903, JNCI-M, JNCI-ER
>> >>>
>> >>> swm_at_emanon.com
>> >>>
>> >>>
>> >>> Knowledge is power.
>> >>>
>> >>> Power corrupts.
>> >>>
>> >>> Study hard and be Eeeeviiiil......
>> >>>
>> >>>
>> >>>
>> >>> Molomo wrote:
>> >>>
>> >>>> Experts,
>> >>>>
>> >>>> Jeff Doyle says LSA type 4 is allowed in nssa area ( see table
>> below). I
>> >>>> would have thought that since LSA 5 is not permitted then no need to
>> >>>> generate LSA 4.
>> >>>>
>> >>>> My understanding is , ABR generates LSA 4 based on the type 5, to
>> >>>> describe
>> >>>> the position of the ASBR.
>> >>>>
>> >>>>
>> >>>> Or am I missing something here?
>>
>>

-- 
Narbik Kocharians
CCSI#30832, CCIE# 12410 (R&S, SP, Security)
www.MicronicsTraining.com
Sr. Technical Instructor
Blogs and organic groups at http://www.ccie.net