Re: LSA Type 4 again

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?
>>>>
>>>>
>>>> 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\Recommended%20Reading\Books\Cisco%20press\Jeff%20Doyle\CCIE_Professional_Development_Routing_TCPIP,_Volume_I,_Second_Edition.chm::/1587052024/ch08lev1sec1.html#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
>>>
>>
>>
>> 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 <http://www.micronicstraining.com/><http://www.micronicstraining.com/>
> Sr. Technical Instructor
>
>

-- 
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