`bridge_name` is still present in templates during and post FFU causing further updates failure

Environment

• Red Hat OpenStack 17.1 [post FFU]

Issue

• bridge_name is no longer a valid variable
• Presence of bridge_name leads to further updates failure
• If stack update is ran post FFU with NetworkDeploymentActions it will cause an outage leading to creation of new ovs-bridge named bridge_name and disrupting the VM FIP connectivity

Resolution

• Modify nic-config files and replace bridge_name with either "{{ neutron_physical_bridge_name }}" or "br-ex"

  Existing

  name: bridge_name
  type: ovs_bridge
  use_dhcp: false
  

  To

  type: ovs_bridge
  name: {{ neutron_physical_bridge_name }}
  

  Or

  name: br-ex
  type: ovs_bridge
  

• There is a This content is not included.Bug raised to get the changes incorporated post upgrade

Root Cause

• The templates still contain older name called bridge_name which no longer is valid in RHOSP17.1

Diagnostic Steps

• While checking /etc/os-net-config/config.yaml on compute and controller, it shows entry with name bridge_name

• Similarly in compute.j2 also have bridge_name

• In ovs-vsctl show displays new bridge and all vlans part of it now whereas br-ex remains blank

    Bridge bridge_name
        fail_mode: standalone
        Port vlan453
            tag: 453
            Interface vlan453
                type: internal
        Port bridge_name
            Interface bridge_name
                type: internal
        Port bond2
            Interface bond2
        Port vlan456
            tag: 456
            Interface vlan456
                type: internal
        Port patch-provnet-25b288a3-1fda-4eea-ad03-2ea8d79ee2c6-to-br-int
            Interface patch-provnet-25b288a3-1fda-4eea-ad03-2ea8d79ee2c6-to-br-int
                type: patch
                options: {peer=patch-br-int-to-provnet-25b288a3-1fda-4eea-ad03-2ea8d79ee2c6}
        Port patch-provnet-fcdb8b2a-750d-436d-a96e-e2b5e671b610-to-br-int
            Interface patch-provnet-fcdb8b2a-750d-436d-a96e-e2b5e671b610-to-br-int
                type: patch
                options: {peer=patch-br-int-to-provnet-fcdb8b2a-750d-436d-a96e-e2b5e671b610}
        Port patch-provnet-0a1585b2-1cc8-4df7-86b8-ad84ab2042e9-to-br-int
            Interface patch-provnet-0a1585b2-1cc8-4df7-86b8-ad84ab2042e9-to-br-int
                type: patch
                options: {peer=patch-br-int-to-provnet-0a1585b2-1cc8-4df7-86b8-ad84ab2042e9}

    Bridge br-ex
        fail_mode: standalone
        Port br-ex
            Interface br-ex
                type: internal
    ovs_version: "3.1.4"

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