I just upgrade my RB450s to RouterOS 6.38.1 and this broke my setup. Im not exactly sure why but maybe some can explain it to me in more detail
Router1 has a LAN_Bridge running VRRP110 (VLAN110 as only port in the bridge)
Router2 has a VLAN110 interface running VRRP110
Note: Both routers are connected to a CRS125 which act as switch (switchport trunk) and the switch is also upgraded tot 6.38.1
When u upgrade to 6.38.1 the LAN_Bridge seems to cause the issue (configured as RSTP) when i disable the bridge and move VRRP110 fro LAN_Bridge to VLAN110 it is working. When i disable RSTP it is also working.
The ip adres on the bridge becomes unreachable
It has something to do with the following change:
Important note!!!
RouterOS v6.38 contains STP/RSTP changes which makes bridges compatible with IEEE 802.1Q-2014 by sending and processing BPDU packets without VLAN tag.
To avoid STP/RSTP compatibility issues with older RouterOS versions, upgrade RouterOS to v6.38 on all routers in Layer2 networks with VLAN and STP/RSTP configurations.
The recommended procedure is to start by upgrading the remotest routers and gradually do it to the Root Bridge device.
If after upgrade you experience loss of connectivity, then disabling STP/RSTP on RouterOS bridge interface will restore connectivity so you can complete upgrade process on your network.