backbone.border.j2

{# Inputs expected:
   a_zone_name
   z_zone_name
   a_border_1_lo0_address
   a_border_2_lo0_address
   z_border_1_lo0_address
   z_border_2_lo0_address
#}

{% set a_borders = [
  {"id": "1", "name": "border-sw-001", "lo0": a_border_1_lo0_address},
  {"id": "2", "name": "border-sw-002", "lo0": a_border_2_lo0_address},
] %}

{% set z_borders = [
  {"id": "1", "name": "border-sw-001", "lo0": z_border_1_lo0_address},
  {"id": "2", "name": "border-sw-002", "lo0": z_border_2_lo0_address},
] %}

{# ======================= A-SIDE BORDERS ======================= #}
{% for local in a_borders %}
! --------------------------------------------------------------
! Paste this block into {{ a_zone_name }} {{ local.name }}
! This creates BGP sessions from:
!   {{ a_zone_name }} {{ local.name }} -> all Z-side borders in {{ z_zone_name }}
! --------------------------------------------------------------
router bgp 400940
{% for remote in z_borders %}
   neighbor {{ remote.lo0 }} remote-as 400940
   neighbor {{ remote.lo0 }} next-hop-self
   neighbor {{ remote.lo0 }} update-source Loopback0
   neighbor {{ remote.lo0 }} description Backbone [{{ a_zone_name }}-{{ z_zone_name }}] {{ '%03d'|format(local.id|int) }}-{{ '%03d'|format(remote.id|int) }}
   neighbor {{ remote.lo0 }} route-map BORDER_ALLOW_BACKBONE_IN_V4 in
   neighbor {{ remote.lo0 }} route-map BORDER_ALLOW_BACKBONE_OUT_V4 out
{% endfor %}
   address-family ipv4
{% for remote in z_borders %}
      neighbor {{ remote.lo0 }} activate
{% endfor %}
!
{% endfor %}

{# ======================= Z-SIDE BORDERS ======================= #}
{% for local in z_borders %}
! --------------------------------------------------------------
! Paste this block into {{ z_zone_name }} {{ local.name }}
! This creates BGP sessions from:
!   {{ z_zone_name }} {{ local.name }} -> all A-side borders in {{ a_zone_name }}
! --------------------------------------------------------------
router bgp 400940
{% for remote in a_borders %}
   neighbor {{ remote.lo0 }} remote-as 400940
   neighbor {{ remote.lo0 }} next-hop-self
   neighbor {{ remote.lo0 }} update-source Loopback0
   {# A-side ID must always be first in the pair: A-Z #}
   neighbor {{ remote.lo0 }} description Backbone [{{ a_zone_name }}-{{ z_zone_name }}] {{ '%03d'|format(remote.id|int) }}-{{ '%03d'|format(local.id|int) }}
   neighbor {{ remote.lo0 }} route-map BORDER_ALLOW_BACKBONE_IN_V4 in
   neighbor {{ remote.lo0 }} route-map BORDER_ALLOW_BACKBONE_OUT_V4 out
{% endfor %}
   address-family ipv4
{% for remote in a_borders %}
      neighbor {{ remote.lo0 }} activate
{% endfor %}
!
{% endfor %}