VLAN SDN VNet Stops OSPF From Working

P

PrimeYeti

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Feb 10, 2025
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Currently I have a VLAN SDN zone setup with 3 nodes in it. I also have FRR setup on each node that is supposed to use OSPF to get its default gateways from some upstream routers, however, on the routers the neighbor state doesn't change from 'Init' indicating that there isn't bidirectional OSPF communication.

Everything else works it is just the OSPF on the nodes specifically that are having the problem. FRR configured on a VM on the nodes is also fine.

After some testing I thought it was just an MTU issue, however, even after ensuring that MTU on all interfaces is configured to 1500, this still doesn't work. I then created a separate zone that is exactly the same as the original zone except it doesn't have any VNets in. As soon as I put one of the nodes into this zone the OSPF neighborship comes up on this node. As soon as I add a VNet to the zone, the neighborship then drops again.

Any idea why adding a VNet would kill OSPF and how I could resolve it?
 
Can you post your exact configuration as well as some debug output (in the state where OSPF is not working)?

Code: 
pveversion -v

cat /etc/frr/frr.conf
vtysh -c 'show ip ospf summary'
vtysh -c 'show ip ospf interface'
vtysh -c 'show ip ospf neighbor detail'

cat /etc/network/interfaces
cat /etc/network/interfaces.d/sdn
 
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