VPLS: MTU 1500 on interface to CPE

RouterOS Forwarding Protocols
1

Hello.

Could you please advise, if it’s possible to transfer customers packets with MTU 1500 with VPLS:
CPE1: ethernet interface → Mikrotik1: ethernet → Mikrotik1: bridge → Mikrotik1: vpls → Mikrotik1: l2tp+IPSec → Mikrotik1: ppp over lte modem → INTERNET → Mikrotik2: ethernet_to_isp → Mikrotik2: l2tp+IPSec → Mikrotik2: vpls → Mikrotik2: bridge → Mikrotik2: ethernet → CPE2: ethernet interface

I understand, that for such purposes it’s necessary to use packet-fragmentation and it can be problems with hardware performance, but is it possible and how?
I’ve tried to increase MPLS MTU, but it seems that it’s necessary to tune packet fragmentation on l2tp and lte modem interfaces.

Regards,
Modest Sokolov

2

Hi, yes i think that is possible, but only using VPLS tunnels in the middle, if you want to add another header stage like L2TP/IPSec and PPP it will decrease the MTU by default.

3

Yes, you are right, but what about packet fragmentation?
Can Mikrotik fragment VPLS packets and transfer them in L2TP/IPSec and PPP packets?

Regards,
Modest Sokolov