i have topology like in the picture.

i had enable rstp in every bridge. but still looping

for 4.4.4.4 (remote address) had changed to 1.1.1.2

Try a basic OSPF config and disable all of your rstp in all bridges. This is how I prefer to solve loop issues.

I don't think that ospf as ip route distribution protocol can help with bridge loops if someone needs to run bridges, because it is different level of iso/osi model.

I don't think that ospf as ip route distribution protocol can help with bridge loops if someone needs to run bridges, because it is different level of iso/osi model.

yes i need to run bridge here, would you like to help solve my problem?, maybe give some clue for searching in internet

I don't think that ospf as ip route distribution protocol can help with bridge loops if someone needs to run bridges, because it is different level of iso/osi model.

is it posible just bridge virtual interface like vlan or eoip without bridge real interface (ether1,.....) ?. i mean is it posible run without add real interface into bridge (will rstp work ?) to block a virtual interface (became alternate port)?

because when i looked rstp not bocking a virtual interfce became alternate port (role = alternate-port), in my case all interface bridge became dessignated-port and root-port (for eoip from sw_B to sw_a)

what protocol or port causing loop usually ? and what happend/effect if i drop it ?

is it enough like this ?

0 chain=forward action=drop
dst-mac-address = 01:00:0C:CC:CC:CC/FF:FF:FF:FF:FF:FF

1 chain=forward action=accept in-interface=EOIP-400-ANTP mac-protocol=ip
dst-port=5678 ip-protocol=udp

2 chain=input action=accept in-interface=EOIP-400-ANTP mac-protocol=ip
dst-port=5678 ip-protocol=udp

3 chain=output action=accept mac-protocol=ip dst-port=5678 ip-protocol=udp

4 chain=forward action=drop mac-protocol=ip packet-type=broadcast

5 chain=forward action=drop mac-protocol=ipv6 packet-type=broadcast

Maybe you can use routing instead bridging to get rid of these problems. Do you really insist on the bridges? If so, why?

Maybe you can use routing instead bridging to get rid of these problems. Do you really insist on the bridges? If so, why?

it is exiting topology buddy, i cant change it, i just can add it or increase it better

what happen if i block this "0 chain=forward action=drop
dst-mac-address = 01:00:0C:CC:CC:CC/FF:FF:FF:FF:FF:FF" and block broadcast ?