dhcp port binding fail

[Xurong Yang]

When creating a subnet while ovs agent is down, the subnet and the corresponding dhcp port are created successfully. However, the vif_type of the port is "binding_failed" and the segment is NULL so when ovs agent restarts, it won't set the vlan tag of the dhcp port and there is no chance for the vif_type to be set again.

I think we need a mechanism the validate the dhcp port so dhcp agent can recreate or update the port when the vif_type is invalid.

[Eugene Nikanorov (enikanorov)]

Removing assignee due to lack of activity

[Romil Gupta (romilg)]

I am trying to reproduce this and fix accordingly.

[ratalevolamena (chris-techno1307)]

how to fix this bug???

[songqianxia (songlihui1947)]

Will you please share your ideas, what you will do for it?

[vikas choudhary (choudharyvikas16)]

Hi..any body working on this bug?

[vikas choudhary (choudharyvikas16)]

As there is no activity on this since months, I am assigning it to myself.

[vikas choudhary (choudharyvikas16)]

I want to discuss on https://bugs.launchpad.net/neutron/+bug/1348589.This is there for more than a year and no discussion i could find on this.

Scenario:
ovs-agent is down and then a network and subnet under this newly created network are created using cli. No error visible to user, but following irregularities are found.

Discrepancies:
1. neutron port-show <dhcp-port> shows:
     binding:vif_type | binding_failed
2. Running "ovs-ofctl dump-flows br-tun", no of-flow got added
3. Running "ovs-vsctl show br-int", no tag for dhcp-port.

neutron db will have all the attributes required to retry vif binding.My query is when should we trigger this rebinding.Two approaches i could think of are:
1> At neutron server restart, for all ports with vif_type as "binding_failed" plugins/ml2/drivers/mech_agent.bind_port can be invoked as a sync up activity.

2> In neutron port update api, http://developer.openstack.org/api-ref-networking-v2-ext.html , could be enhanced to receive vif binding related options also and then eventually plugins/ml2/drivers/mech_agent.bind_port can be invoked.Corresponding changes will be made to 'port update cli' also.

Please suggest.