# Setup BIRD
Tips: Use with network role for loopback/dummy interface configuraton

## Supported OS
- AlmaLinux 8/9
- Rocky Linux 8/9
- CentOS 7
- Debian 11/12

## Bird config examples
<details>
  <summary>Using template config</summary>

    # Set routing interface
    bird_interface: "eth1"
    bird:
      bgp:
        common:
          storage04.s3.msk2.example.com:
            routerid: 10.101.42.14
          storage05.s3.msk2.example.com:
            routerid: 10.101.42.15
          storage06.s3.msk2.example.com:
            routerid: 10.101.42.16
          storage07.s3.msk2.example.com:
            routerid: 10.101.42.17
        static:
          - name: STATIC1
            networks:
              storage04.s3.msk2.example.com:
                - ip: "10.110.42.1/32"
                  bgp_local_pref: "100"
                  interface: "{{ bird_interface }}"
                - ip: "10.110.42.21/32"
                  bgp_local_pref: "100"
                  interface: "{{ bird_interface }}"
              storage05.s3.msk2.example.com:
                - ip: "10.110.42.1/32"
                  bgp_local_pref: "100"
                  interface: "{{ bird_interface }}"
                - ip: "10.110.42.21/32"
                  bgp_local_pref: "100"
                  interface: "{{ bird_interface }}"
              storage06.s3.msk2.example.com:
                - ip: "10.110.42.1/32"
                  bgp_local_pref: "100"
                  interface: "{{ bird_interface }}"
                - ip: "10.110.42.21/32"
                  bgp_local_pref: "100"
                  interface: "{{ bird_interface }}"
              storage07.s3.msk2.example.com:
                - ip: "10.110.42.1/32"
                  bgp_local_pref: "100"
                  interface: "{{ bird_interface }}"
                - ip: "10.110.42.21/32"
                  bgp_local_pref: "100"
                  interface: "{{ bird_interface }}"
        bgp:
          - name: SW06
            remote_asnum: 4200200000
            local_asnum: 4200200000
            confederation: 209684
            remote_addr: "10.127.2.6"
            export:
              - STATIC1
          - name: SW10
            remote_asnum: 4200200000
            local_asnum: 4200200000
            confederation: 209684
            remote_addr: "10.127.2.10"
            export:
              - STATIC1

</details>

<details>
  <summary>Complete config override</summary>

    bird:
      bgp_asnum: 4200200000
      bgp_mesh:
        controller1.example.com:
          routerid: "10.180.0.101"
          bgp:
            - "10.180.0.101"
            - "192.168.255.101"
        controller2.example.com:
          routerid: "10.180.0.102"
          bgp:
            - "10.180.0.102"
            - "192.168.255.102"
        controller3.example.com:
          routerid: "10.180.0.103"
          bgp:
            - "10.180.0.103"
            - "192.168.255.103"
        compute1.example.com:
          routerid: "10.180.0.104"
          bgp:
            - "10.180.0.104"
            - "192.168.255.104"
        compute2.example.com:
          routerid: "10.180.0.105"
          bgp:
            - "10.180.0.105"
            - "192.168.255.105"
    
    bird_config_override: |
      log syslog all;
      router id {{ bird.bgp_mesh[inventory_hostname].bgp[0] }};
    
      filter bgp_mesh_export {
          if net ~ [192.168.0.101/32] then accept;
          if net ~ [192.168.0.102/32] then accept;
          if net ~ [192.168.0.103/32] then accept;
          if net ~ [192.168.0.104/32] then accept;
          if net ~ [192.168.0.105/32] then accept;
          reject;
      }
      filter bgp_mesh_import {
          if net ~ [192.168.0.101/32] then accept;
          if net ~ [192.168.0.102/32] then accept;
          if net ~ [192.168.0.103/32] then accept;
          if net ~ [192.168.0.104/32] then accept;
          if net ~ [192.168.0.105/32] then accept;
          reject;
      }
    
      protocol device {
      }
    
      protocol direct {
        ipv4;
        ipv6;
      }
    
      protocol kernel KERNEL4 {
        merge paths yes;
        learn;
        ipv4 {
          export all;
        };
      }
    
      protocol kernel KERNEL6 {
        ipv6 {
          export all;
        };
      }
    
      {% for host in bird.bgp_mesh %}
      {% for protocol_bgp in bird.bgp_mesh[host].bgp %}
      {% if inventory_hostname not in host %}
      protocol bgp {{ host.split(".")[0] }}_{{ loop.index * 100 }} {
        password "3472e7d08e4aca276d72b5165adfc189";
        source address {{ bird.bgp_mesh[inventory_hostname].bgp[loop.index0] }};
        local as {{ bird.bgp_asnum }};
        neighbor {{ protocol_bgp }} as {{ bird.bgp_asnum }};
        hold time 10;
        ipv4 {
          import filter bgp_mesh_import;
          export filter bgp_mesh_export;
        };
        default bgp_local_pref {{ 300 - (loop.index * 100) }};
      }
    
      {% endif %}
      {% endfor %}
      {% endfor %}

</details>