Mikrotik STP and RSTP on bridges

RouterOS General
1

Hi, to make some tests I created a loop topology with an unmanaged switch and I connected it to a mikrotik port; then I made two vlan interfaces on two physical ports of the mikrotik and I setted up the bridge betwenn these two ports.
Then I connected the other port of the mikrotik to a Cisco 2960 which supports rapid-pvst.
As i Thought when I enabled the bridge on the mikrotik the loop occurred and went through the mikrotik getting to the Cisco that put the ports in blocking state.
Then to see if mikrotik would have blocked the loop (as Cisco did) I enabled STP on the bridge interface on the mikrotik but I noticed that whatever I did, mikrotik was enable to block the looped topology.
Is there something I’m missing in the mikrotik configuration to let it manage the STP architecure?

I’m using an rb1000 with RouterOS v5.19


Thanks

2
  1. What are the bridge priorities on the Cisco and the Mikrotik?
  2. post the output of show spanning-tree vlan on the cisco for the VLANs in question.
  3. how many redundant links are there between the devices?
3

Hi,

  1. The priorities are default set (8000 hex on the mikrotik if I’m not wrong).
  2. For the VLAN in question, sh spanning-tree vlan shows both ports of the cisco in fwd
  3. Between the devices there are 2 redundant links so you’ll have:
    Switch A (unmanaged with a loop in it) —> Mikrotik port 4
    Mikrotik port 3 → Cisco 2960
    Cisco 2960 → Switch A

Sorry I don’t currently have the cisco to post complete results (as far as I’ll get it back I’ll post the output).

Thanks