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On 6/18/21 2:16 PM, Jonathan Stewart wrote:
>
> Finally, views do differ, i'm sure others have opinions that do not 
> match mine.
>
I don't see anything wrong in what you said. I'll add some detail on 
what we're doing in case it's helpful (or if someone can educate me if 
I'm doing something bad):

I use MTU 9000 on my transit connections, /coordinated with the transit 
provider/, because there seems to be no harm in doing that.

I use MTU 9000* on all my router-to-router links because I need to be 
able to carry larger-than-1500-byte circuit traffic. If nothing else, 
circuit VLANs all need to be a bit over 1500 bytes on the outside (i.e. 
with my tags and possibly tags of other carriers involved) so that they 
are 1500 bytes on the inside. * Maybe I should/will-need-to change this 
to 9000 + a bit to allow for 9000 inside.

I'm 1500 bytes at the customer edge for Internet. I'm also 1500 bytes at 
IXes.

-- 
Richard