[j-nsp] Best practice MTU?

[Saku Ytti]

On (2012-04-27 09:33 +1000), Chris Kawchuk wrote:

> I usually set the interface physical MTU as high as it goes (per device), but manually set protocol inet to MTU 1500 (for things like OSPF to work). This allows for as-large-as-MTU-as-MPLS-can-do. Other address families aren't that picky about MTU matching.

+1. 

Short of platform specific side-effects it might cause like static
buffering per MTU ranges causing available buffers to be significantly
reduced when enabling large MTU. It is always good idea to set L2 and L3
link MTU to as large as they go, regardless if they match on ends or not,
and then for L3 protocols which rely link MTU being same, set it in
protocol level.
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  ++ytti