network/roles/exit/templates/isc-dhcp-relay.j2

{% set dhcp_vlans = vrf_prefixes | selectattr('custom_fields.dhcp_ranges')
    | map(attribute='vlan.vid') | sort -%}

# What servers should the DHCP relay forward requests to?
SERVERS="{{ dhcp }}"

# On what interfaces should the DHCP relay (dhrelay) serve DHCP requests?
# Always include the interface towards the DHCP server.
# This variable requires a -i for each interface configured above.
# This will be used in the actual dhcrelay command
# For example, "-i eth0 -i eth1"
INTF_CMD="{{ interfaces | selectattr('parent') | selectattr('parent.name', '==', 'bridge')
    | selectattr('untagged_vlan') | selectattr('untagged_vlan.vid', 'in', dhcp_vlans)
    | map(attribute='name') | sort | map('regex_replace', '^', '-id ') | join(' ') }} -iu {{ iface_uplink }} -iu peerlink.4"

# Additional options that are passed to the DHCP relay daemon?
OPTIONS="-U outside"