On Juniper: ping mpls rsvp <name> sweep
100! 5052! 7528! 8768! 9388. 9080! 9392. 9236. 9160! 9240. 9200. 9180. 9172! 9184. 9180. 9176! --- lsp ping sweep result--- Maximum Transmission Unit (MTU) is 9176 bytes I'm sure other hardware can test a link the same way. I'd make sure to test all the possible paths in both directions. MTU means different things to different hardware. Cisco seems to mean payload while juniper is the actual MTU. On Wed, Apr 5, 2017 at 11:00 PM, Jason McKemie < [email protected]> wrote: > So just max out the wireless equipment between the routers, but make sure > either end is less than the radios? As far as I can tell from looking > around in forums, Ubiquiti will do 2024. I'm not sure what a Ceragon > IP-20C will do, or where this setting is located in the interface. > > On Wed, Apr 5, 2017 at 2:54 PM, Cassidy B. Larson <[email protected]> > wrote: > >> 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 <j.mckemie@veloxinetbroadband. >> com> 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]> >> 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]] *On Behalf Of *Jason McKemie >>> *Sent:* Wednesday, April 5, 2017 12:46 PM >>> *To:* [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 >>> >> >> >> > -- Carl Peterson *PORT NETWORKS* 401 E Pratt St, Ste 2553 Baltimore, MD 21202 (410) 637-3707
