Re: [Lsr] Working Group Adoption Poll for "OSPF Extension for Prefix Originator" - draft-wang-lsr-ospf-prefix-originator-ext-01

[Peter Psenak <[e-mail]>]

Hi Dirk,

On 18/02/2019 14:27 , Goethals, Dirk (Nokia - BE/Antwerp) wrote:
> Hi Peter,
> See inline DG>.
> Dirk
>
>
> On 2/18/2019 14:18, Peter Psenak wrote:
>> Hi Dirk,
>>
>> On 18/02/2019 09:31 , Goethals, Dirk (Nokia - BE/Antwerp) wrote:
>>> support +1
>>>
>>> 1 question:
>>>
>>>> When S1 in another area receives such LSA, it then can learn that
>>>>    prefix Lt1 is associated with node T1, check the ELC, ERLD, or MSD
>>>>    value according to its necessity, and construct the right label
>>>> stack
>>>>    at the ingress node S1 for the traffic destined to Lt1.
>>>
>>> How is S1 going to know the "ELC, ERLD, or MSD" of  node T1?
>>> I guess, T1 will need to send an AS-scoped router info LSA?
>>
>> yes, that is a possibility.
>>
>>>
>>> If so, should T1 be ASBR as to be able to send this AS-scoped LSA?
>>
>> I would not think so.
> DG> What's the use of an AS-scoped LSA, if the receiver has no way
> to identify/locate the advertising router? Making T1 an ASBR will
> enforce the ABR to create a T4 LSA.

if the T1 advertises some properties in it's AS-scoped LSA and you use 
these when you send a traffic to some of the prefixes that T1 
originates, then you don't really need to know where it is located, you 
only care about its properties.



>>
>>
>>> I guess it was needed before as to enforce  the ABR to create the T4
>>> LSAs,
>>> so that others can learn which ABR to use to reach T4, but I guess
>>> it's not needed anymore when this draft is implemented.
>>
>> not sure how you reached the above conclusion. Can you please clarify?
> DG> Since the ABR is adding the originator, one can indirectly learn that
> the originator is also reachable via this ABR.

well, I don't think we want to replace the Type-4 LSA functionality with 
the Prefix-Originator.

thanks,
Peter

>>
>> thanks,
>> Peter
>>
>>
>>
>>>
>>> Regards,
>>> Dirk
>>>
>>>
>>> On 2/13/2019 14:25, Acee Lindem (acee) wrote:
>>>>
>>>> This begins a two week adoption poll for the subject draft. Please
>>>> send your comments to this list before 12:00 AM UTC on Thursday,
>>>> February 28^th , 2019.
>>>>
>>>>
>>>>
>>>> All authors have responded to the IPR poll and there is one
>>>> <https://datatracker.ietf.org/ipr/search/?submit=draft&id=draft-wang-lsr-ospf-prefix-originator-ext>
>>>> https://datatracker.ietf.org/ipr/search/?submit=draft&id=draft-wang-lsr-ospf-prefix-originator-ext
>>>>
>>>>
>>>> It is listed multiple times but references the same CN201810650141.
>>>>
>>>>
>>>>
>>>> Thanks,
>>>>
>>>> Acee
>>>>
>>>>
>>>>
>>>>
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>