Re: [Sidrops] [GROW] IXP Route Server question

[Nick Hilliard <[e-mail]>]

Sriram, Kotikalapudi (Fed) wrote on 10/03/2022 03:31:
> Nick and all,
> 
> Thank you. What you all shared/discussed is very useful info.

>> Almost all RS's are transparent these days.  Usually IXPs go to
>> lengths to ensure that the RS ASN doesn't appear in the AS path.

> Good to know that. Well, that means there can be an occasional RS
> that is non-transparent. When there is a non-transparent RS, could
> there be big ISPs (Tier-1, Tier-2) present there as RS-clients?

I would seriously doubt it.  There are some "Tier 1" and "Tier 2" 
providers who peer using route servers at IXPs, but it's a bit unusual 
(and entertaining to hear them strenuously denying that this ever happens).

Non-transparent RS's were used until a couple of years ago but I'm not 
aware of any left at this point. Even when non-transparent RS's were 
more widespread, I would have expected the intersection of these two 
groups to be null, and that if there were an intersection, the 
Tier1/Tier2 providers would not be upset if those paths were dropped / 
marked as invalid.

> The ASPA verification draft treats the relationship of RS to
> RS-client as similar to that of Provider to Customer. Seems
> reasonable? The AS of an RS client includes the RS's AS in its ASPA
> as a "Provider".

yes, this is reasonable.

Nick