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I'm setting up the following configuration RB1009 v6.42.1 with ether 5.6 in LACP (802.3ad) counted on a TP-link T2600G-52TS with LAG configured ports 1.2.
I activated MPLS (LDP), the neighbors are OK, but VPLS does not work and when I ping-1500 with the not fragment option, it returns the necessary timeout or fragments.
If you run ping size 1492, it works

My question is if the LACP has MTU size limit and what size MTUs maximize?

Can anybody help me?

Below setting:

RB1009
/interface bridge
add admin-mac=64:D1:54:XX:XX:XX auto-mac=no fast-forward=no name=lobridge
/interface ethernet
set [ find default-name=ether1 ] comment="Port 1" l2mtu=1598
set [ find default-name=ether2 ] comment="Port 2" l2mtu=1598 \
mac-address=64:D1:54:XX:XX:XX
/interface bonding
add comment=LACP1 mode=802.3ad name=LACP1 slaves=ether1,ether2 \
transmit-hash-policy=layer-2-and-3
/interface vlan
add interface=LACP1 name=vlan2090 vlan-id=2090

/mpls interface
set [ find default=yes ] interface=ether3 mpls-mtu=1550
add interface=vlan2090 mpls-mtu=1530
/mpls ldp
set enabled=yes lsr-id=192.168.254.254 transport-address=192.168.254.254
/mpls ldp interface
add interface=vlan2090

Hi, I think that you'll need to check if your switch support layer2 MTU higher than 1530bytes, usually everything related with MPLS seems to be related to MTU, just remember there are 3 types of MTU: L3MTU, MPLS-MTU and L2MTU; and it must follows this order: L3MTU < MPLS-MTU <= L2MTU