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Interfaces of br-int are down

I have wield observation. But firstly, I explain what I have now: dedicated controller, compute and networking nodes running on Ubuntu12.04 with Havana, and using GRE to tunnel traffics. Everything is fine, traffic can go though router and instance can ping outside.

But, when I use "ovs-ofctl show br-int" on networking node, I get this

1(patch-tun): addr:6a:21:24:6a:8f:fb
 config:     0
 state:      0
 speed: 0 Mbps now, 0 Mbps max  
 2(qr-7e18429b-c4): addr:4a:01:00:00:00:00
 config:     PORT_DOWN
 state:      LINK_DOWN
 speed: 0 Mbps now, 0 Mbps max  
 3(tap2efc0c06-cb):addr:4a:01:00:00:00:00
 config:     PORT_DOWN
 state:      LINK_DOWN
 speed: 0 Mbps now, 0 Mbps max  LOCAL(br-int): addr:62:ac:83:9d:38:48
 config:     0
 state:      0
 speed: 0 Mbps now, 0 Mbps max

Can someone explain why the interfaces of br-int are down even though traffic can go though them?

Thanks.

BR, Le