[ovs-dev] br-int bridge dpid changes when openvswitch is restarted

Thu Oct 27 23:51:42 UTC 2016

Hi there,

Has anyone noticed a "connection flapping" behaviour for the br-int bridge (used between openstack and opendaylight's netvirt module) when openvswitch is restarted? I've provided some details below.

Scenario:

-          Opendaylight 3-node cluster running distribution-karaf-0.5.0-Boron with the odl-ovsdb-openstack feature installed

-          A standalone OVS node running OVS version 2.4.0

-          Step 1) set-manager of OVS node to all 3-nodes in the cluster

-          Step 2) confirm that br-int is created automatically by the Opendaylight's NetVirt module) and all pipeline flows are pushed to the OVS node

-          Step 3) on the OVS node, run systemctl stop openvswitch

-          Step 4) on the OVS node, run systemctl start openvswitch

Here is what ovs-vswitchd.log shows at step 4):

It seems like the bridge has an initial dpid 0000bc8838168d41 that connects to opendaylight and then it changes to dpid 0000b88fc560944b and disconnects and reconnects to opendaylight.

Can anyone provide insight on the errors:
2016-10-26T19:16:24.929Z|00001|ofproto_dpif_upcall(handler5)|INFO|received packet on unassociated datapath port 0
2016-10-26T19:16:25.430Z|00001|dpif(revalidator4)|WARN|system at ovs-system: failed to flow_get (Invalid argument) ufid:b1d72bef-1acb-4755-850a-2aeb4fb75ad2 <empty>, packets:0, bytes:0, used:never
2016-10-26T19:16:25.430Z|00002|ofproto_dpif_upcall(revalidator4)|WARN|Failed to acquire udpif_key corresponding to unexpected flow (Invalid argument): ufid:b1d72bef-1acb-4755-850a-2aeb4fb75ad2

Do the errors above cause the bridge to get a new dpid, which then causes the disconnect and reconnect to opendaylight?

Thanks,
Bertrand

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