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

Anoop Ghanwani <anoop@alumni.duke.edu> Wed, 01 March 2017 18:27 UTC

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From: Anoop Ghanwani <anoop@alumni.duke.edu>
Date: Wed, 01 Mar 2017 10:27:14 -0800
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To: "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
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Subject: Re: [spring] WG Last Call for draft-ietf-spring-segment-routing-msdc-02
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On Wed, Mar 1, 2017 at 9:21 AM, Stefano Previdi (sprevidi) <
sprevidi@cisco.com> wrote:

>
> > On Mar 1, 2017, at 5:48 PM, Anoop Ghanwani <anoop@alumni.duke.edu>
> wrote:
> >
> > Thanks for the responses.
> >
> > On Wed, Mar 1, 2017 at 7:44 AM, Stefano Previdi (sprevidi) <
> sprevidi@cisco.com> wrote:
> >
> > > On Feb 28, 2017, at 8:29 PM, Anoop Ghanwani <anoop@alumni.duke.edu>
> wrote:
> > >
> > >
> > > - pg 5, line 1
> > >   What is the criteria that allow sharing the AS number?  Is there a
> reference?
> >
> >
> > we changed this to “use the same AS”. As explained in 4.3, using the
> same AS brings the update loop prevention mechanism so facilitate filtering
> and propagation.
> >
> >
> > I think your response is about the spine/leaf nodes.  My comment is
> about the ToR nodes.
>
>
> the same applies. The rules and guidelines related to bgp deployment and
> AS numbering are the same.
>
>
In this draft, we have:
>>>

 For efficient usage of the scarce 2-byte Private Use AS pool,
         different Tier-3 nodes might share the same AS.

>>>

In RFC 7938, we have:
>>>

 A unique ASN is allocated to every Tier 3 device (e.g., ToR) in
      this topology.

>>>

What I am asking for is clarification on how different Tier-3 nodes might
share the same AS number.

Your comment above (referencing 4.3) is talking about a different scheme
(iBGP) in which case I am assuming all nodes (spine, leaf, tor) share the
same AS number.

Thanks,
Anoop

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