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[Rodolfo Alonso <1732448@xxxxxxxxxxxxxxxxxx>]

Bug closed due to lack of activity, please feel free to reopen if
needed.

** Changed in: neutron
       Status: Confirmed => Won't Fix

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https://bugs.launchpad.net/bugs/1732448

Title:
  segment host mapping table overwritten by multiple l2 agents

Status in neutron:
  Won't Fix

Bug description:
  The routed-networks feature introduced changes to create mapping
  entries linking hosts to segments [1].  That feature assumes that only
  a single L2 agent will be reporting device mappings to physical
  networks.  If multiple agents are running (e.g., OVS + SRIOV) then the
  "segmenthostmappings" tuples which are created by a first agent
  reporting state are overwritten when subsequent agents report state.

  The segments data model and agent update callbacks [2] do not handle
  cases where multiple L2 agents are present on a node.

  The configuration to reproduce this is simple. Create a compute node
  where the OVS agent reports interface mappings to physnet0 and the
  SRIOV agent reports device mappings to physnet1. Then create a network
  with provider:physical_network=physnet1, and then another network with
  provider:physical_network=physnet0.  Those networks will each create a
  NetworkSegment entry.  Then restart the OVS agent.  This will cause
  the segmenthostmappings table to be overwritten with only those
  segments accessible via the OVS agent.  Then restart the SRIOV agent.
  This will cause the segmenthostmappings table to be overwritten with
  only those segments accessible via the SRIOV agent.

  This impacts the scheduling of DHCP networks and IP address
  allocations for networks that have routed segments enabled.

  [1] https://git.openstack.org/cgit/openstack/neutron/commit/?id=3d3f0595ebb3a20949d52b7226a2d4551f0eaf6d
  [2] neutron.services.segments.db._update_segment_host_mapping_for_agent

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