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> > 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. We don't typically see carriers looking for anything greater than about 2000 bytes in practice, though we also follow a similar 9000 byte configuration on our internal transport links. 1500 to the internet edge. You could fiddle with the MTU to eek out a few extra bytes for circuits, but what you're doing today already ~4x the real world use cases that we've seen. Maybe experiences differ for providers that carry a lot of traffic between data centers. Ben Wiechman Director of IP Strategy and Engineering 320.247.3224 | [log in to unmask] Arvig | 224 East Main Street | Melrose, MN 56352 | arvig.com On Fri, Jun 18, 2021 at 2:53 PM Richard Laager <[log in to unmask]> wrote: > 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 > > > ------------------------------ > > To unsubscribe from the MICE-DISCUSS list, click the following link: > http://lists.iphouse.net/cgi-bin/wa?SUBED1=MICE-DISCUSS&A=1 >