Vlan/MPLS/VPLS issue V7 ?

RouterOS General
1

Once again the story repeats…

We had V6 around the network and everything was working fine… but we wanted to migrate to V7 and 99% is great (did some OSPF and BGP additional config) except that some devices are not able to reach cloud controller… They’re using Https and I can only guess that we have an MTU problem …

I’ve tried every MTU configuration for Ethernet, VLANs, MPLS, VPLS, with no luck :frowning:

Is there a (simple) way to understand and configure all to work? (I’m pretty sure that switches and Radio links do support jumbo frames so bigger MTU won’t be the problem there) …

And, yes, it’s the sites we’re using Network Fabric :slight_smile:

Thanks,
Dejan J

2

I deploy jumbo frames even on wireless equipment. As long as L2 MTU and L3 is configured correctly across the various paths in the network, there’s no issue.

Different wireless equipment have different MTU support, check with the vendor.

3

Right… I have it working in test environment… but there’s something (netonix, ubnt, xyz, …) that’s killing the MTU :smiley:

I’ll have to dig :confused:


P.S. I hope my MTU values are not wrong (1530 for MPLS, 1508 VPLS and I think it’s 1600 for the ethernet … I left VLAN at 1500?)

4

Refer to this:
http://forum.mikrotik.com/t/does-mtu-on-loopback-matter/171231/4

5

Yes, thanks.

It turned out that my config was good but one of the radio pairs was not passing 1500+ packets (or 1528, or somewhere in between). Fixing that (changed the data path) and everything is working like a clock :slight_smile:

Thanks,
Dejan