Re: Sunday traffic curiosity

["Valdis Klētnieks" <valdis.kletnieks () vt edu>]

On Sun, 22 Mar 2020 13:17:59 -0600, Grant Taylor via NANOG said:

> As someone who 1) wasn't around during the last Internet scale foray
> into multicast and 2) working with multicast in a closed environment,
> I'm curios:
>
> What was wrong with Internet scale multicast?  Why did it get abandoned?

It failed to scale for some of the exact same reasons QoS failed to scale -
what works inside one administrative domain doesn't work once it crosses domain
boundaries.

Plus, there's a lot more state to keep - if you think spanning tree gets ugly
if the tree gets too big, think about what happens when the multicast covers
3,000 people in 117 ASN's, with people from multiple ASN's joining and leaving
every few seconds.

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