sonic-buildimage/dockers/docker-dhcp-relay/dhcpv6-relay.monitors.j2

[group:dhcpmon]
programs=
{%- set add_preceding_comma = { 'flag': False } %}
{% set monitor_instance = { 'flag': False } %}
{% for vlan_name in VLAN_INTERFACE %}
{% if VLAN and vlan_name in VLAN and 'dhcp_servers' in VLAN[vlan_name] and VLAN[vlan_name]['dhcp_servers']|length > 0 %}
{% set _dummy = monitor_instance.update({'flag': True}) %}
{%- endif %}
{% if VLAN and vlan_name in VLAN and 'dhcpv6_servers' in VLAN[vlan_name] and VLAN[vlan_name]['dhcpv6_servers']|length > 0 %}
{% set _dummy = monitor_instance.update({'flag': True}) %}
{%- endif %}
{% if monitor_instance.flag %}
{% if add_preceding_comma.flag %},{% endif %}
{% set _dummy = add_preceding_comma.update({'flag': True}) %}
dhcpmon-{{ vlan_name }}
{%- set _dummy = monitor_instance.update({'flag': False}) %}
{%- endif %}
{% endfor %}


{# Create a program entry for each DHCP MONitor instance #}
{% set relay_for_ipv4 = { 'flag': False } %}
{% set relay_for_ipv6 = { 'flag': False } %}
{% for vlan_name in VLAN_INTERFACE %}
{# Check DHCPv4 agents #}
{% if VLAN and vlan_name in VLAN and 'dhcp_servers' in VLAN[vlan_name] and VLAN[vlan_name]['dhcp_servers']|length > 0 %}
{% for dhcp_server in VLAN[vlan_name]['dhcp_servers'] %}
{% if dhcp_server | ipv4 %}
{% set _dummy = relay_for_ipv4.update({'flag': True}) %}
{% endif %}
{% endfor %}
{% endif %}
{# Check DHCPv6 agents #}
{% if VLAN and vlan_name in VLAN and 'dhcpv6_servers' in VLAN[vlan_name] and VLAN[vlan_name]['dhcpv6_servers']|length > 0 %}
{% for dhcpv6_server in VLAN[vlan_name]['dhcpv6_servers'] %}
{% if dhcpv6_server | ipv6 %}
{% set _dummy = relay_for_ipv6.update({'flag': True}) %}
{% endif %}
{% endfor %}
{% endif %}
{% if relay_for_ipv4.flag or relay_for_ipv6.flag %}
[program:dhcpmon-{{ vlan_name }}]
{# We treat this VLAN as a downstream interface (-id), as we only want to listen for requests #}
command=/usr/sbin/dhcpmon -id {{ vlan_name }}
{#- Dual ToR Option #}
{% if 'subtype' in DEVICE_METADATA['localhost'] and DEVICE_METADATA['localhost']['subtype'] == 'DualToR' %} -u Loopback0{% endif -%}
{#- We treat all other interfaces as upstream interfaces (-iu), as we only want to listen for replies #}
{% for (name, prefix) in VLAN_INTERFACE|pfx_filter %}
{% if prefix | ipv4 and name != vlan_name %} -iu {{ name }}{% endif -%}
{% endfor %}
{% for (name, prefix) in INTERFACE|pfx_filter %}
{% if prefix | ipv4 %} -iu {{ name }}{% endif -%}
{% endfor %}
{% for (name, prefix) in PORTCHANNEL_INTERFACE|pfx_filter %}
{% if prefix | ipv4 %} -iu {{ name }}{% endif -%}
{% endfor %}
{% if MGMT_INTERFACE %}
{% for (name, prefix) in MGMT_INTERFACE|pfx_filter %}
{% if prefix | ipv4 %} -im {{ name }}{% endif -%}
{% endfor %}
{% endif %}
{% if relay_for_ipv4.flag %} -4{% endif %}
{% if relay_for_ipv6.flag %} -6{% endif %}

priority=4
autostart=false
autorestart=false
stdout_logfile=syslog
stderr_logfile=syslog
dependent_startup=true
dependent_startup_wait_for=
{%- if relay_for_ipv4.flag %}isc-dhcpv4-relay-{{ vlan_name }}:running {% endif %}
{% if relay_for_ipv6.flag %}isc-dhcpv6-relay-{{ v6_vlan_list|join("-") }}:running{% endif %}


{% set _dummy = relay_for_ipv4.update({'flag': False}) %}
{% set _dummy = relay_for_ipv6.update({'flag': False}) %}
{% endif %}
{% endfor %}