sonic-buildimage/files/image_config/interfaces/interfaces.j2

#
{% block banner %}
# =============== Managed by SONiC Config Engine DO NOT EDIT! ===============
# generated from /usr/share/sonic/templates/interfaces.j2 using sonic-cfggen
# file: /etc/network/interfaces
#
{% endblock banner %}
{% block loopback %}
# The loopback network interface
auto lo
iface lo inet loopback
# Use command 'ip addr list dev lo' to check all addresses
{% for (name, prefix) in LOOPBACK_INTERFACE %}
iface lo {{ 'inet' if prefix | ipv4 else 'inet6' }} static
    address {{ prefix | ip }}
    netmask {{ prefix | netmask if prefix | ipv4 else prefix | prefixlen }}
#
{% endfor %}
{% endblock loopback %}
{% block mgmt_interface %}
# The management network interface
auto eth0
{% if MGMT_INTERFACE %}
{% for (name, prefix) in MGMT_INTERFACE %}
iface eth0 {{ 'inet' if prefix | ipv4 else 'inet6' }} static
    address {{ prefix | ip }}
    netmask {{ prefix | netmask if prefix | ipv4 else prefix | prefixlen }}
    ########## management network policy routing rules
    # management port up rules
    up ip {{ '-4' if prefix | ipv4 else '-6' }} route add default via {{ MGMT_INTERFACE[(name, prefix)]['gwaddr'] }} dev eth0 table default
    up ip {{ '-4' if prefix | ipv4 else '-6' }} route add {{ prefix | network }}/{{ prefix | prefixlen }} dev eth0 table default
    up ip {{ '-4' if prefix | ipv4 else '-6' }} rule add from {{ prefix | ip }}/{{ '32' if prefix | ipv4 else '128' }} table default
{% for route in MGMT_INTERFACE[(name, prefix)]['forced_mgmt_routes'] %}
    up ip rule add to {{ route }} table default
{% endfor %}
    # management port down rules
    down ip {{ '-4' if prefix | ipv4 else '-6' }} route delete default via {{ MGMT_INTERFACE[(name, prefix)]['gwaddr'] }} dev eth0 table default
    down ip {{ '-4' if prefix | ipv4 else '-6' }} route delete {{ prefix | network }}/{{ prefix | prefixlen }} dev eth0 table default
    down ip {{ '-4' if prefix | ipv4 else '-6' }} rule delete from {{ prefix | ip }}/{{ '32' if prefix | ipv4 else '128' }} table default
{% for route in MGMT_INTERFACE[(name, prefix)]['forced_mgmt_routes'] %}
    down ip rule delete to {{ route }} table default
{% endfor %}
{# TODO: COPP policy type rules #}
{% endfor %}
{% else %}
iface eth0 inet dhcp
{% endif %}
#
{% endblock mgmt_interface %}
{% block front_panel_interfaces %}
# The switch front panel interfaces
{% for (name, prefix) in INTERFACE %}
allow-hotplug {{ name }}
iface {{ name }} {{ 'inet' if prefix | ipv4 else 'inet6' }} static
    mtu {{ PORT[name]['mtu'] if PORT[name]['mtu'] else 9100 }}
    address {{ prefix | ip }}
    netmask {{ prefix | netmask if prefix | ipv4 else prefix | prefixlen }}
#
{% endfor %}
{% if PORTCHANNEL %}
# "|| true" is added to suppress the error when interface is already a member of LAG
# "ip link show | grep -q master" is added to ensure interface is enslaved
{% for pc in PORTCHANNEL.keys()|sort %}
{% for member in PORTCHANNEL[pc]['members'] %}
allow-hotplug {{ member }}
iface {{ member }} inet manual
    pre-up teamdctl {{ pc }} port add {{ member }} || true
    post-up ip link show {{ member }} | grep -q master && ifconfig {{ member }} up
    post-down ifconfig {{ member }} down
#
{% endfor %}
{% endfor %}
{% endif %}
{% endblock front_panel_interfaces %}
{% block pc_interfaces %}
{% if PORTCHANNEL_INTERFACE %}
# Portchannel interfaces
{% for (name, prefix) in PORTCHANNEL_INTERFACE.keys() | sort %}
allow-hotplug {{ name }}
iface {{ name }} {{ 'inet' if prefix | ipv4 else 'inet6' }} static
    mtu {{ PORTCHANNEL[name]['mtu'] if PORTCHANNEL[name]['mtu'] else 9100 }}
    address {{ prefix | ip }}
    netmask {{ prefix | netmask if prefix | ipv4 else prefix | prefixlen }}
#
{% endfor %}
{% endif %}
{% endblock pc_interfaces %}