Internet Exchanges supporting jumbo frames?

Niels Bakker niels=nanog at
Thu Mar 10 00:44:07 UTC 2016

* nanog at (Kurt Kraut via NANOG) [Thu 10 Mar 2016, 00:59 CET]:
>I'm pretty confident there is no need for a specific MTU consensus 
>and not all IXP participants are obligated to raise their interface 
>MTU if the IXP starts allowing jumbo frames.

You're wrong here.  The IXP switch platform cannot send ICMP Packet 
Too Big messages.  That's why everybody must agree on one MTU.

>So we have Tier-1 backbones moving jumbo frames around continents, 
>why in a controlled L2 enviroment that usually resides in a single 
>building and managed by a single controller having jumbo frames is 
>that concerning?

Because the L3 devices connected to it aren't controlled by a single entity.

	-- Niels.

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