Re: LSA Type 4 again

It will be easy to lab it up.

R1 ------ Area 0 ------ R2 ------ Area 1 ------- R3

Set area 1 to nssa and configure R3 to redistribute a connected interface.
Then, do a "Show ip ospf da asbr-summ" on R1. Then try it again without
having Area 1 as NSSA and see the difference.

On Sun, Sep 6, 2009 at 1:03 PM, Mohamed El Henawy <m.henawy_at_link.net> wrote:

> Hello Molomo ,
>
> can you plz share the output of the show ?
>
>
>
> ----- Original Message ----- From: "Molomo" <letjedilakopa_at_gmail.com>
> To: "Rick Mur" <rmur_at_ipexpert.com>
> Cc: <ccielab_at_groupstudy.com>
> Sent: Sunday, September 06, 2009 5:50 PM
> Subject: Re: LSA Type 4 again
>
>
>
> Rick,
>> Actually I did lab it and it was not permitted,
>>
>> R1---area 1--- R2 ---area 0 --- R3 --area 0--- R4--- area 2--- R5
>>
>> area 0 backbone
>> area 1 normal area
>> area 2 is nssa
>>
>> R5 ASBR
>>
>> on R1 I cannot see the LSA type 4.
>>
>> Regards,
>> Molomo
>>
>>
>>
>> On Sun, Sep 6, 2009 at 4:43 PM, Rick Mur <rmur_at_ipexpert.com> wrote:
>>
>> It could be allowed in the NSSA area, but it would have no use.
>>> You are correct, the ABR generates a type 4 LSA, when it sees type 5
>>> LSA's
>>> indeed to describe the location of the ASBR.
>>>
>>> Try to lab it up. Create a topology, insert some external routes in OSPF
>>> and issue a 'show ip ospf database' on a router within the NSSA and see
>>> if
>>> you have a type-4 in your database. It's always good to see the theory
>>>
>> being
>>
>>> confirmed in a lab, at least that is what helps me to understand and
>>> remember the theory.
>>>
>>>
>>> --
>>> Regards,
>>>
>>> Rick Mur
>>> CCIE2 #21946 (R&S / Service Provider)
>>> Sr. Support Engineer IPexpert, Inc.
>>> URL: http://www.IPexpert.com <http://www.ipexpert.com/> <
>>> http://www.ipexpert.com/>
>>>
>>>
>>> On 6 sep 2009, at 16:27, 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?
>>>>
>>>>
>>>> I have also seen this in Quick Reference Sheet by Anthony Sequeira.
>>>>
>>>>
>>>>
>>>>
>>>> Table 8-5. LSA types allowed per area type.
>>>>
>>>> Area Type
>>>>
>>>> 1&2
>>>>
>>>> 3
>>>>
>>>> 4
>>>>
>>>> 5
>>>>
>>>> 7
>>>>
>>>> Backbone (area 0)
>>>>
>>>> Yes
>>>>
>>>> Yes
>>>>
>>>> Yes
>>>>
>>>> Yes
>>>>
>>>> No
>>>>
>>>> Non-backbone, non-stub
>>>>
>>>> Yes
>>>>
>>>> Yes
>>>>
>>>> Yes
>>>>
>>>> Yes
>>>>
>>>> No
>>>>
>>>> Stub
>>>>
>>>> Yes
>>>>
>>>> Yes
>>>>
>>>> No
>>>>
>>>> No
>>>>
>>>> No
>>>>
>>>> Totally stubby
>>>>
>>>> Yes
>>>>
>>>>
>>>> No[*]<mk:@MSITStore
>> :C:\Documents%20and%20Settings\user\Desktop\R&S%20CCIE\Rec
>>
>> ommended%20Reading\Books\Cisco%20press\Jeff%20Doyle\CCIE_Professional_Develop
>> ment_Routing_TCPIP,_Volume_I,_Second_Edition.chm::/1587052024/
>> ch08lev1sec1.ht
>> ml#ch08tn01>
>>
>>>
>>>>
>>>> No
>>>>
>>>> No
>>>>
>>>> No
>>>>
>>>> Not-so-stubby
>>>>
>>>> Yes
>>>>
>>>> Yes
>>>>
>>>> Yes
>>>>
>>>> No
>>>>
>>>> Yes
>>>>
>>>> [*] Except for a single type 3 LSA per ABR, advertising the default
>>>> route
>>>>
>>>>
>>>>
>>>> Regards,
>>>>
>>>> Molomo
>>>>
>>>>
>>>> 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
>>
>> _______________________________________________________________________
>> Subscription information may be found at:
>> http://www.groupstudy.com/list/CCIELab.html
>>
>>
>>
>>
>>
>>
>>
>>
>
>
> --------------------------------------------------------------------------------
>
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.5.409 / Virus Database: 270.13.80/2349 - Release Date: 09/06/09
> 05:51:00
>
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
>

-- 
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