Hello Chenjie, I agree, this is a bug. I think the only reason it hasn’t been an issue is because the only user of the get_fdb_entries RPC is the BGP agent and it is not passing a host in the request (it is None), therefore it excludes the attempt to try and access the parameter as an agent based on the condition in _create_agent_fdb. Here is the BGP caller: https://github.com/starlingx-staging/stx-neutron-dynamic-routing/blob/master... From: "Xu, Chenjie" <chenjie.xu@intel.com> Date: Wednesday, November 28, 2018 at 10:11 AM To: "Peters, Matt" <Matt.Peters@windriver.com> Cc: "starlingx-discuss@lists.starlingx.io" <starlingx-discuss@lists.starlingx.io> Subject: [Starlingx-discuss] Analysis of patch 88b7bc7 for StartlingX upstreaming Hi Matt, I think that there exists a bug in patch 88b7bc7. Function _get_fdb_entries will call function _create_agent_fdb by following line: https://github.com/starlingx-staging/stx-neutron/blob/master/neutron/plugins... The variable “host” will be used to call _create_agent_fdb. However function _create_agent_fdb expects variable “agent”: https://github.com/starlingx-staging/stx-neutron/blob/master/neutron/plugins... I think this should be a bug. Could you please help review and comment? Best Regards, Xu, Chenjie