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I had the same problem some time ago! I had it with Icehouse on Ubuntu 14, could you tell us your version?

The problem is your dhcp agent tag 4095, which is equivalent to be unassigned VLAN tag for your local DHCP agents (it looks like you have 2 of them):

        Port "qg-89453d16-b7"
            tag: 4095                   <------------------- bad tag should be low number 2-10 usually
            Interface "qg-89453d16-b7"
                type: internal
        Port "qr-b143c6db-76"
            tag: 4095                 <--------------------- bad tag should be low number 2-10 usually
            Interface "qr-b143c6db-76"
                type: internal

What you need to do is remove and add back your network from dhcp agent as follows: neutron net-list #get network id neutron agent-list |grep -i dhcp #get <agent id=""> from first column

neutron dhcp-agent-network remove <agent id=""> <neutron net-list=""> neutron dhcp-agent-network remove <agent id=""> <neutron net-list="">

verify if your tag id 4095 is gone and should be low number perhaps below 10 or so, definitely below 4095