Hi, Team!

 

Pretty long time we’re experiencing some troubles with auto-restoration of ovs after some storms. We’re using neutron-wallaby and openvswitch 2.15.

 

The problem is the next:

 

After some storms we’re receiving situation, when ovs agent constantly recreating bridges and doing full syncs, which affects our network stability.

 

All versions (incl. 2024.2), containing some parts of code that I want to highlight:

1. Non-empty `idl_monitor.bridges_added` triggers
2. `_do_reconfigure_physical_bridges`, then it triggers
3. `setup_physical_bridges(bridge_mappings)` then it contains
4. br.create()

 

I’m seeing note in code «The bridge already exists, so create won't recreate it», BUT at the same time we’re receiving in logs:

 

```

Matched CREATE: BridgeCreateEvent(events=('create',), table='Bridge', conditions=None, old_conditions=None) to row=Bridge(name=br-tun

```

and

```

BridgeCreateEvent, bridge name: br-tun

```

 

Constantly – by hours and for all our bridges (we have four: br-tun, br-ex, br-int, br-rmi) while we will not restart ovs agent.

So this event filling idl_monitor.bridges_added then ovs reacting on it by _do_reconfigure_physical_bridges, then it triggers br.create() and we’re receiving event once again – we’re in loop.

 

Want to add that our datapath-id NOT changing between these runs – keeps same.

 

Any ideas or ways how to fix this problem and never experience it next?