Re: [spring] WG Last Call for draft-ietf-spring-segment-routing-msdc-02

["Stefano Previdi (sprevidi)" <[e-mail]>]

> On Mar 1, 2017, at 3:39 PM, [e-mail] wrote:
> 
> Hi Stefano,
> 
>> From: Stefano Previdi (sprevidi) [mailto:[e-mail]]  > Sent: Tuesday, February 28, 2017 10:16 AM
>> 
>> Hi Bruno,
>> 
>> thanks for the review. I integrated all the comments in the new version I'm going to submit
>> very soon.
> 
> 
> Thanks.
> 
> 
>> One last comment here below:
>> 
>>> On Feb 22, 2017, at 2:00 PM, [e-mail] wrote:
>>> 
>>> 2)      For the document write up, are there any known deployment of draft-ietf-spring-
>> segment-routing-msdc?
>>> 
>>> 
>>> 3)      § 2.1.  Reference design
>>> 
>>> "   o  Each node is its own AS (Node X has AS X)
>>> 
>>>      *  For simple and efficient route propagation filtering, Nodes 5,
>>>         6, 7 and 8 share the same AS, Nodes 3 and 4 share the same AS,
>>>         Nodes 9 and 10 share the same AS.
>>> 
>>>      *  For efficient usage of the scarce 2-byte Private Use AS pool,
>>>         different Tier-3 nodes might share the same AS.
>>> 
>>>      *  Without loss of generality, we will simplify these details in
>>>         this document and assume that each node has its own AS."
>>> 
>>> 
>>> First 2 bullets are contradicting each other's.
>> 
>> 
>> why so ? First bullet refers to tier-1 and tier-2. second bullet refers to tier-3.
> 
> Bullet 1: "Each node is its own AS"
> Bullet 2: "Nodes 5, 6, 7 and 8 share the same AS”


ok sorry, the indent was such that I was confused.


> Looks a priori contradicting.
> Now thinking more about this, and given that on your 5-stage clos topology nodes 5, 6, 7 and 8 are not connected to each other's and any flow has no valid reason to cross two of them, I now see what you mean.
> 
> I would then propose the following change:
> OLD: share the same AS
> NEW: use the same AS number


I agree. I also think that “sharing” has other implications which are not intended here.


> It may look the same, but the two nodes are indeed in different ASes. But they use the same AS number, just like private AS number.
> 
> Or may be it's just me ;-)  So up to you.


no, it’s me too ;-)

s.


> 
> Thanks,
> -- Bruno
>> 
>> thanks.
>> s.
>> 
> 
> 
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