DPDK Instances can't ping. ovs-tcpdump shows no traffic on the interface.

Issue

After spawning DPDK instances you can't ping anything (default gateway, other instances even if on the same compute node).

If you look on your compute node for the interface assigned to the instance you see the link_state down and the interface disconnected:

[root@compute0 ~]# ovs-vsctl list interface vhu12345678-18 | grep _state
admin_state         : up
link_state          : down
[root@compute0 ~]# ovs-vsctl get interface vhu12345678-18 status
{mode=client, status=disconnected}