Is there any data on packet duplication?

Tue Jun 23 05:21:31 UTC 2020

On Tue, 23 Jun 2020 at 08:12, William Herrin <bill at herrin.us> wrote:

Hey Bill,

> That's what spanning tree and its compatriots are for. Otherwise,
> ordinary broadcast traffic (like those arp packets) would travel in a
> loop, flooding the network and it would just about instantly collapse
> when you first turned it on.

Metro: S1-S2-S3-S1
PE1: S1
PE2: S2
Customer: S3
STP blocking: ANY

S3 sends frame, it is unknown unicast flooded, S1+S2 both get it
(regardless of which metro port blocks), which will send it via PE to
Internet.

STP doesn't help, at all. Hope this helps.

-- 
  ++ytti