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Re: [Idr] Comments on draft-ietf-idr-bgp-prefix-sid-01

"Stefano Previdi (sprevidi)" <sprevidi@cisco.com> Wed, 11 November 2015 08:00 UTC

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From: "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
To: Eric C Rosen <erosen@juniper.net>
Thread-Topic: [Idr] Comments on draft-ietf-idr-bgp-prefix-sid-01
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Date: Wed, 11 Nov 2015 08:00:39 +0000
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Subject: Re: [Idr] Comments on draft-ietf-idr-bgp-prefix-sid-01
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On Nov 9, 2015, at 5:02 PM, Eric C Rosen <erosen@juniper.net> wrote:
> 
> On 11/6/2015 8:18 AM, Stefano Previdi (sprevidi) wrote:
>> A prefix may have a shorter mask than 32 (or 128) and still be ok for
>> the Originator SRGB to be there.
> 
> Stefano,
> 
> On further thought, I wonder if I misunderstood the point of your question.  If all the addresses falling under a given prefix are loopback addresses of the same node, then the same SRGB might apply to all of them.


yes, but note that nothing mandates that we use only loopback addresses and nothing mandates a loopback address to be a /32.


>  In that case, it might make sense to have a shorter prefix but still advertise the Originator-SRGB.  Is that what you're thinking?


yes and more widely, I don’t want to constrain the advertisement of the Originator-SRGB to a /32 (or even to a loopback interface prefix).

s.

 
>  But on the other hand, if a node has multiple loopback addresses, it probably won't want the same SID assigned to all of them.
> 
> Eric

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