I always suggest you max out all your MTUs. MTU sizes have to match on both sides of a MPLS tunnel as well. It’s always nice to have equal or greater MTU available in between those two end points. 9200+ bytes or bust! :)
> On Apr 5, 2017, at 1:36 PM, Jason McKemie <[email protected]> > wrote: > > Thanks. > > So I want to set my Layer2 MTU on the Mikrotik Interface to something greater > than 1530, then the MTU on the interface to something greater than 1530, but > less than I have the Layer2 MTU set to? Then just set the MPLS MTU to 1530? > Is there any rule of thumb for the gap between all of these? > > On Wed, Apr 5, 2017 at 2:13 PM, Sterling Jacobson <[email protected] > <mailto:[email protected]>> wrote: > My MTU on all MPLS stuff is set for over 9000 so I can do jumbo. > > > > If you don’t want fragmentation or problems, your native MTU on layer2 needs > to be larger probably. > > Then the next layer up a bit smaller, and so on so that you can again pass > layer2 over the MPLS network at 1530. > > > > > > From: Af [mailto:[email protected] <mailto:[email protected]>] On > Behalf Of Jason McKemie > Sent: Wednesday, April 5, 2017 12:46 PM > To: [email protected] <mailto:[email protected]> > Subject: [AFMUG] MPLS/VPLS MTU > > > > What is the best way to test a link to make sure you're not going to have > issues running MPLS over it? Can the packets be fragmented, or will that > cause issues? I'm able to ping the other end of a couple of links with 1530 > byte packets, but when I disallow fragmentation, things stop working. > > > > -Jason > >
