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	diff --git a/python/vyos/ifconfig.py b/python/vyos/ifconfig.py
	index 217f898fa..786753b8c 100644
	--- a/python/vyos/ifconfig.py
	+++ b/python/vyos/ifconfig.py
	@@ -1,1084 +1,1084 @@
	# Copyright 2019 VyOS maintainers and contributors <maintainers@vyos.io>
	#
	# This library is free software; you can redistribute it and/or
	# modify it under the terms of the GNU Lesser General Public
	# License as published by the Free Software Foundation; either
	# version 2.1 of the License, or (at your option) any later version.
	#
	# This library is distributed in the hope that it will be useful,
	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	# Lesser General Public License for more details.
	#
	# You should have received a copy of the GNU Lesser General Public
	# License along with this library. If not, see <http://www.gnu.org/licenses/>.

	import os
	import subprocess
	import jinja2

	from vyos.validate import *
	from ipaddress import IPv4Network, IPv6Address
	from netifaces import ifaddresses, AF_INET, AF_INET6
	from time import sleep

	dhcp_cfg = """
	# generated by ifconfig.py
	option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;
	interface "{{ intf }}" {
	send host-name "{{ hostname }}";
	request subnet-mask, broadcast-address, routers, domain-name-servers, rfc3442-classless-static-routes, domain-name, interface-mtu;
	}
	"""

	dhcpv6_cfg = """
	# generated by ifconfig.py
	interface "{{ intf }}" {
	request routers, domain-name-servers, domain-name;
	}
	"""

	dhclient_base = r'/var/lib/dhcp/dhclient_'

	class Interface:
	def __init__(self, ifname, type=None):
	"""
	This is the base interface class which supports basic IP/MAC address
	operations as well as DHCP(v6). Other interface which represent e.g.
	and ethernet bridge are implemented as derived classes adding all
	additional functionality.

	DEBUG:
	This class has embedded debugging (print) which can be enabled by
	creating the following file:
	vyos@vyos# touch /tmp/vyos.ifconfig.debug

	Example:
	>>> from vyos.ifconfig import Interface
	>>> i = Interface('eth0')
	"""

	if not os.path.exists('/sys/class/net/{}'.format(ifname)) and not type:
	raise Exception('interface "{}" not found'.format(str(ifname)))

	self._ifname = str(ifname)
	self._debug = False

	if os.path.isfile('/tmp/vyos.ifconfig.debug'):
	self._debug = True

	if not os.path.exists('/sys/class/net/{}'.format(ifname)):
	cmd = 'ip link add dev "{}" type "{}"'.format(ifname, type)
	self._cmd(cmd)

	# per interface DHCP config files
	self._dhcp_cfg_file = dhclient_base + self._ifname + '.conf'
	self._dhcp_pid_file = dhclient_base + self._ifname + '.pid'
	self._dhcp_lease_file = dhclient_base + self._ifname + '.leases'

	# per interface DHCPv6 config files
	self._dhcpv6_cfg_file = dhclient_base + self._ifname + '.v6conf'
	self._dhcpv6_pid_file = dhclient_base + self._ifname + '.v6pid'
	self._dhcpv6_lease_file = dhclient_base + self._ifname + '.v6leases'


	def _debug_msg(self, msg):
	if self._debug:
	- print('"DEBUG/{}: {}'.format(self._ifname, msg))
	+ print('DEBUG/{}: {}'.format(self._ifname, msg))


	def remove(self):
	"""
	Remove system interface

	Example:
	>>> from vyos.ifconfig import Interface
	>>> i = Interface('eth0')
	>>> i.remove()
	"""

	# stop DHCP(v6) if running
	self.del_dhcp()
	self.del_dhcpv6()

	# NOTE (Improvement):
	# after interface removal no other commands should be allowed
	# to be called and instead should raise an Exception:
	cmd = 'ip link del dev "{}"'.format(self._ifname)
	self._cmd(cmd)


	def _cmd(self, command):
	self._debug_msg(command)

	process = subprocess.Popen(command,stdout=subprocess.PIPE, shell=True)
	proc_stdout = process.communicate()[0].strip()

	# add exception handling code
	pass


	def _read_sysfs(self, filename):
	"""
	Provide a single primitive w/ error checking for reading from sysfs.
	"""
	value = None
	with open(filename, 'r') as f:
	value = f.read().rstrip('\n')

	- self._debug_msg('read "{}" <- "{}"'.format(value, filename))
	+ self._debug_msg("read '{}' < '{}'".format(value, filename))
	return value


	def _write_sysfs(self, filename, value):
	"""
	Provide a single primitive w/ error checking for writing to sysfs.
	"""
	- self._debug_msg('write "{}" -> "{}"'.format(value, filename))
	+ self._debug_msg("write '{}' > '{}'".format(value, filename))
	with open(filename, 'w') as f:
	f.write(str(value))

	return None


	@property
	def mtu(self):
	"""
	Get/set interface mtu in bytes.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').mtu
	'1500'
	"""
	return self._read_sysfs('/sys/class/net/{0}/mtu'
	.format(self._ifname))


	@mtu.setter
	def mtu(self, mtu):
	"""
	Get/set interface mtu in bytes.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').mtu = 1400
	>>> Interface('eth0').mtu
	'1400'
	"""
	if mtu < 68 or mtu > 9000:
	raise ValueError('Invalid MTU size: "{}"'.format(mru))

	return self._write_sysfs('/sys/class/net/{0}/mtu'
	.format(self._ifname), mtu)

	@property
	def mac(self):
	"""
	Get/set interface mac address

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').mac
	'00:0c:29:11:aa:cc'
	"""
	return self._read_sysfs('/sys/class/net/{0}/address'
	.format(self._ifname))


	@mac.setter
	def mac(self, mac):
	"""
	Get/set interface mac address

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').mac = '00:90:43:fe:fe:1b'
	>>> Interface('eth0').mac
	'00:90:43:fe:fe:1b'
	"""
	# a mac address consits out of 6 octets
	octets = len(mac.split(':'))
	if octets != 6:
	raise ValueError('wrong number of MAC octets: {} '.format(octets))

	# validate against the first mac address byte if it's a multicast address
	if int(mac.split(':')[0]) & 1:
	raise ValueError('{} is a multicast MAC address'.format(mac))

	# overall mac address is not allowed to be 00:00:00:00:00:00
	if sum(int(i, 16) for i in mac.split(':')) == 0:
	raise ValueError('00:00:00:00:00:00 is not a valid MAC address')

	# check for VRRP mac address
	if mac.split(':')[0] == '0' and addr.split(':')[1] == '0' and mac.split(':')[2] == '94' and mac.split(':')[3] == '0' and mac.split(':')[4] == '1':
	raise ValueError('{} is a VRRP MAC address'.format(mac))

	# Assemble command executed on system. Unfortunately there is no way
	# of altering the MAC address via sysfs
	cmd = 'ip link set dev "{}" address "{}"'.format(self._ifname, mac)
	self._cmd(cmd)


	@property
	def arp_cache_tmo(self):
	"""
	Get configured ARP cache timeout value from interface in seconds.
	Internal Kernel representation is in milliseconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').arp_cache_tmo
	'30'
	"""
	return (self._read_sysfs('/proc/sys/net/ipv4/neigh/{0}/base_reachable_time_ms'
	.format(self._ifname)) / 1000)


	@arp_cache_tmo.setter
	def arp_cache_tmo(self, tmo):
	"""
	Set ARP cache timeout value in seconds. Internal Kernel representation
	is in milliseconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').arp_cache_tmo = '40'
	"""
	return self._write_sysfs('/proc/sys/net/ipv4/neigh/{0}/base_reachable_time_ms'
	.format(self._ifname), (int(tmo) * 1000))

	@property
	def link_detect(self):
	"""
	How does the kernel act when receiving packets on 'down' interfaces

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').link_detect
	'0'
	"""
	return self._read_sysfs('/proc/sys/net/ipv4/conf/{0}/link_filter'
	.format(self._ifname))


	@link_detect.setter
	def link_detect(self, link_filter):
	"""
	Konfigure kernel response in packets received on interfaces that are 'down'

	0 - Allow packets to be received for the address on this interface
	even if interface is disabled or no carrier.

	1 - Ignore packets received if interface associated with the incoming
	address is down.

	2 - Ignore packets received if interface associated with the incoming
	address is down or has no carrier.

	Default value is 0. Note that some distributions enable it in startup
	scripts.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').link_detect = '1'
	"""
	if link_filter >= 0 and link_filter <= 2:
	return self._write_sysfs('/proc/sys/net/ipv4/conf/{0}/link_filter'
	.format(self._ifname), link_filter)
	else:
	raise ValueError()


	@property
	def ifalias(self):
	"""
	Get/set interface alias name

	Example:

	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').ifalias
	''
	"""
	return self._read_sysfs('/sys/class/net/{0}/ifalias'
	.format(self._ifname))


	@ifalias.setter
	def ifalias(self, ifalias=None):
	"""
	Get/set interface alias name

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').ifalias = 'VyOS upstream interface'
	>>> Interface('eth0').ifalias
	'VyOS upstream interface'

	to clear interface alias e.g. delete it use:

	>>> Interface('eth0').ifalias = ''
	>>> Interface('eth0').ifalias
	''
	"""
	if not ifalias:
	# clear interface alias
	ifalias = '\0'

	self._write_sysfs('/sys/class/net/{0}/ifalias'
	.format(self._ifname), ifalias)


	@property
	def state(self):
	"""
	Enable (up) / Disable (down) an interface

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').state
	'up'
	"""
	return self._read_sysfs('/sys/class/net/{0}/operstate'
	.format(self._ifname))


	@state.setter
	def state(self, state):
	"""
	Enable (up) / Disable (down) an interface

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').state = 'down'
	>>> Interface('eth0').state
	'down'
	"""
	if state not in ['up', 'down']:
	raise ValueError('state must be "up" or "down"')

	# Assemble command executed on system. Unfortunately there is no way
	# to up/down an interface via sysfs
	cmd = 'ip link set dev "{}" "{}"'.format(self._ifname, state)
	self._cmd(cmd)

	@property
	def proxy_arp(self):
	"""
	Get current proxy ARP configuration from sysfs. Default: 0

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').proxy_arp
	'0'
	"""
	return self._read_sysfs('/proc/sys/net/ipv4/conf/{}/proxy_arp'
	.format(self._ifname))

	@proxy_arp.setter
	def proxy_arp(self, enable):
	"""
	Set per interface proxy ARP configuration

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').proxy_arp = 1
	>>> Interface('eth0').proxy_arp
	'1'
	"""
	if int(enable) >= 0 and int(enable) <= 1:
	return self._write_sysfs('/proc/sys/net/ipv4/conf/{}/proxy_arp'
	.format(self._ifname), enable)
	else:
	raise ValueError("Value out of range")


	@property
	def proxy_arp_pvlan(self):
	"""
	Private VLAN proxy arp.
	Basically allow proxy arp replies back to the same interface
	(from which the ARP request/solicitation was received).

	This is done to support (ethernet) switch features, like RFC
	3069, where the individual ports are NOT allowed to
	communicate with each other, but they are allowed to talk to
	the upstream router. As described in RFC 3069, it is possible
	to allow these hosts to communicate through the upstream
	router by proxy_arp'ing. Don't need to be used together with
	proxy_arp.

	This technology is known by different names:
	In RFC 3069 it is called VLAN Aggregation.
	Cisco and Allied Telesyn call it Private VLAN.
	Hewlett-Packard call it Source-Port filtering or port-isolation.
	Ericsson call it MAC-Forced Forwarding (RFC Draft).

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').proxy_arp_pvlan
	'0'
	"""
	return self._read_sysfs('/proc/sys/net/ipv4/conf/{}/proxy_arp_pvlan'
	.format(self._ifname))

	@proxy_arp_pvlan.setter
	def proxy_arp_pvlan(self, enable):
	"""
	Private VLAN proxy arp.
	Basically allow proxy arp replies back to the same interface
	(from which the ARP request/solicitation was received).

	This is done to support (ethernet) switch features, like RFC
	3069, where the individual ports are NOT allowed to
	communicate with each other, but they are allowed to talk to
	the upstream router. As described in RFC 3069, it is possible
	to allow these hosts to communicate through the upstream
	router by proxy_arp'ing. Don't need to be used together with
	proxy_arp.

	This technology is known by different names:
	In RFC 3069 it is called VLAN Aggregation.
	Cisco and Allied Telesyn call it Private VLAN.
	Hewlett-Packard call it Source-Port filtering or port-isolation.
	Ericsson call it MAC-Forced Forwarding (RFC Draft).

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').proxy_arp_pvlan = 1
	>>> Interface('eth0').proxy_arp_pvlan
	'1'
	"""
	if int(enable) >= 0 and int(enable) <= 1:
	return self._write_sysfs('/proc/sys/net/ipv4/conf/{}/proxy_arp_pvlan'
	.format(self._ifname), enable)
	else:
	raise ValueError("Value out of range")


	def get_addr(self):
	"""
	Retrieve assigned IPv4 and IPv6 addresses from given interface.
	This is done using the netifaces and ipaddress python modules.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').get_addrs()
	['172.16.33.30/24', 'fe80::20c:29ff:fe11:a174/64']
	"""

	ipv4 = []
	ipv6 = []

	if AF_INET in ifaddresses(self._ifname).keys():
	for v4_addr in ifaddresses(self._ifname)[AF_INET]:
	# we need to manually assemble a list of IPv4 address/prefix
	prefix = '/' + str(IPv4Network('0.0.0.0/' + v4_addr['netmask']).prefixlen)
	ipv4.append( v4_addr['addr'] + prefix )

	if AF_INET6 in ifaddresses(self._ifname).keys():
	for v6_addr in ifaddresses(self._ifname)[AF_INET6]:
	# Note that currently expanded netmasks are not supported. That means
	# 2001:db00::0/24 is a valid argument while 2001:db00::0/ffff:ff00:: not.
	# see https://docs.python.org/3/library/ipaddress.html
	bits = bin( int(v6_addr['netmask'].replace(':',''), 16) ).count('1')
	prefix = '/' + str(bits)

	# we alsoneed to remove the interface suffix on link local addresses
	v6_addr['addr'] = v6_addr['addr'].split('%')[0]
	ipv6.append( v6_addr['addr'] + prefix )

	return ipv4 + ipv6


	def add_addr(self, addr):
	"""
	Add IP address to interface. Address is only added if it yet not added
	to that interface.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> j = Interface('eth0')
	>>> j.add_addr('192.0.2.1/24')
	>>> j.add_addr('2001:db8::ffff/64')
	>>> j.get_addr()
	['192.0.2.1/24', '2001:db8::ffff/64']
	"""
	if not is_intf_addr_assigned(self._ifname, addr):
	cmd = 'sudo ip addr add "{}" dev "{}"'.format(addr, self._ifname)
	self._cmd(cmd)


	def del_addr(self, addr):
	"""
	Remove IP address from interface.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> j = Interface('eth0')
	>>> j.add_addr('2001:db8::ffff/64')
	>>> j.add_addr('192.0.2.1/24')
	>>> j.get_addr()
	['192.0.2.1/24', '2001:db8::ffff/64']
	>>> j.del_addr('192.0.2.1/24')
	>>> j.get_addr()
	['2001:db8::ffff/64']
	"""
	if is_intf_addr_assigned(self._ifname, addr):
	cmd = 'ip addr del "{}" dev "{}"'.format(addr, self._ifname)
	self._cmd(cmd)


	# replace dhcpv4/v6 with systemd.networkd?
	def set_dhcp(self):
	"""
	Configure interface as DHCP client. The dhclient binary is automatically
	started in background!

	Example:

	>>> from vyos.ifconfig import Interface
	>>> j = Interface('eth0')
	>>> j.set_dhcp()
	"""
	dhcp = {
	'hostname': 'vyos',
	'intf': self._ifname
	}

	# read configured system hostname.
	# maybe change to vyos hostd client ???
	with open('/etc/hostname', 'r') as f:
	dhcp['hostname'] = f.read().rstrip('\n')

	# render DHCP configuration
	tmpl = jinja2.Template(dhcp_cfg)
	dhcp_text = tmpl.render(dhcp)
	with open(self._dhcp_cfg_file, 'w') as f:
	f.write(dhcp_text)

	cmd = 'start-stop-daemon --start --quiet --pidfile ' + self._dhcp_pid_file
	cmd += ' --exec /sbin/dhclient --'
	# now pass arguments to dhclient binary
	cmd += ' -4 -nw -cf {} -pf {} -lf {} {}'.format(self._dhcp_cfg_file, self._dhcp_pid_file, self._dhcp_lease_file, self._ifname)
	self._cmd(cmd)


	def del_dhcp(self):
	"""
	De-configure interface as DHCP clinet. All auto generated files like
	pid, config and lease will be removed.

	Example:

	>>> from vyos.ifconfig import Interface
	>>> j = Interface('eth0')
	>>> j.del_dhcp()
	"""
	pid = 0
	if os.path.isfile(self._dhcp_pid_file):
	with open(self._dhcp_pid_file, 'r') as f:
	pid = int(f.read())
	else:
	self._debug_msg('No DHCP client PID found')
	return None

	# stop dhclient
	cmd = 'start-stop-daemon --stop --quiet --pidfile {}'.format(self._dhcp_pid_file)
	self._cmd(cmd)

	# cleanup old config file
	if os.path.isfile(self._dhcp_cfg_file):
	os.remove(self._dhcp_cfg_file)

	# cleanup old pid file
	if os.path.isfile(self._dhcp_pid_file):
	os.remove(self._dhcp_pid_file)

	# cleanup old lease file
	if os.path.isfile(self._dhcp_lease_file):
	os.remove(self._dhcp_lease_file)


	def set_dhcpv6(self):
	"""
	Configure interface as DHCPv6 client. The dhclient binary is automatically
	started in background!

	Example:

	>>> from vyos.ifconfig import Interface
	>>> j = Interface('eth0')
	>>> j.set_dhcpv6()
	"""
	dhcpv6 = {
	'intf': self._ifname
	}

	# render DHCP configuration
	tmpl = jinja2.Template(dhcpv6_cfg)
	dhcpv6_text = tmpl.render(dhcpv6)
	with open(self._dhcpv6_cfg_file, 'w') as f:
	f.write(dhcpv6_text)

	# https://bugs.launchpad.net/ubuntu/+source/ifupdown/+bug/1447715
	#
	# wee need to wait for IPv6 DAD to finish once and interface is added
	# this suxx :-(
	sleep(5)

	# no longer accept router announcements on this interface
	cmd = 'sysctl -q -w net.ipv6.conf.{}.accept_ra=0'.format(self._ifname)
	self._cmd(cmd)

	cmd = 'start-stop-daemon --start --quiet --pidfile ' + self._dhcpv6_pid_file
	cmd += ' --exec /sbin/dhclient --'
	# now pass arguments to dhclient binary
	cmd += ' -6 -nw -cf {} -pf {} -lf {} {}'.format(self._dhcpv6_cfg_file, self._dhcpv6_pid_file, self._dhcpv6_lease_file, self._ifname)
	self._cmd(cmd)


	def del_dhcpv6(self):
	"""
	De-configure interface as DHCPv6 clinet. All auto generated files like
	pid, config and lease will be removed.

	Example:

	>>> from vyos.ifconfig import Interface
	>>> j = Interface('eth0')
	>>> j.del_dhcpv6()
	"""
	pid = 0
	if os.path.isfile(self._dhcpv6_pid_file):
	with open(self._dhcpv6_pid_file, 'r') as f:
	pid = int(f.read())
	else:
	self._debug_msg('No DHCPv6 client PID found')
	return None

	# stop dhclient
	cmd = 'start-stop-daemon --stop --quiet --pidfile {}'.format(self._dhcpv6_pid_file)
	self._cmd(cmd)

	# accept router announcements on this interface
	cmd = 'sysctl -q -w net.ipv6.conf.{}.accept_ra=1'.format(self._ifname)
	self._cmd(cmd)

	# cleanup old config file
	if os.path.isfile(self._dhcpv6_cfg_file):
	os.remove(self._dhcpv6_cfg_file)

	# cleanup old pid file
	if os.path.isfile(self._dhcpv6_pid_file):
	os.remove(self._dhcpv6_pid_file)

	# cleanup old lease file
	if os.path.isfile(self._dhcpv6_lease_file):
	os.remove(self._dhcpv6_lease_file)


	class LoopbackIf(Interface):
	def __init__(self, ifname):
	super().__init__(ifname, type='loopback')


	class DummyIf(Interface):
	def __init__(self, ifname):
	super().__init__(ifname, type='dummy')


	class BridgeIf(Interface):
	def __init__(self, ifname):
	super().__init__(ifname, type='bridge')

	@property
	def ageing_time(self):
	"""
	Return configured bridge interface MAC address aging time in seconds.
	Internal kernel representation is in centiseconds, thus its converted
	in the end. Kernel default is 300 seconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').aging_time
	'300'
	"""
	return (self._read_sysfs('/sys/class/net/{0}/bridge/ageing_time'
	.format(self._ifname)) / 100)

	@ageing_time.setter
	def ageing_time(self, time):
	"""
	Set bridge interface MAC address aging time in seconds. Internal kernel
	representation is in centiseconds. Kernel default is 300 seconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').ageing_time = 2
	"""
	time = int(time) * 100
	return self._write_sysfs('/sys/class/net/{0}/bridge/ageing_time'
	.format(self._ifname), time)

	@property
	def forward_delay(self):
	"""
	Get bridge forwarding delay in seconds. Internal Kernel representation
	is in centiseconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').ageing_time
	'3'
	"""
	return (self._read_sysfs('/sys/class/net/{0}/bridge/forward_delay'
	.format(self._ifname)) / 100)

	@forward_delay.setter
	def forward_delay(self, time):
	"""
	Set bridge forwarding delay in seconds. Internal Kernel representation
	is in centiseconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').forward_delay = 15
	"""
	return self._write_sysfs('/sys/class/net/{0}/bridge/forward_delay'
	.format(self._ifname), (int(time) * 100))

	@property
	def hello_time(self):
	"""
	Get bridge hello time in seconds. Internal Kernel representation
	is in centiseconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').hello_time
	'2'
	"""
	return (self._read_sysfs('/sys/class/net/{0}/bridge/hello_time'
	.format(self._ifname)) / 100)


	@hello_time.setter
	def hello_time(self, time):
	"""
	Set bridge hello time in seconds. Internal Kernel representation
	is in centiseconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').hello_time = 2
	"""
	return self._write_sysfs('/sys/class/net/{0}/bridge/hello_time'
	.format(self._ifname), (int(time) * 100))

	@property
	def max_age(self):
	"""
	Get bridge max max message age in seconds. Internal Kernel representation
	is in centiseconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').max_age
	'20'
	"""

	return (self._read_sysfs('/sys/class/net/{0}/bridge/max_age'
	.format(self._ifname)) / 100)

	@max_age.setter
	def max_age(self, time):
	"""
	Set bridge max message age in seconds. Internal Kernel representation
	is in centiseconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').max_age = 30
	"""
	return self._write_sysfs('/sys/class/net/{0}/bridge/max_age'
	.format(self._ifname), (int(time) * 100))

	@property
	def priority(self):
	"""
	Get bridge max aging time in seconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').priority
	'32768'
	"""
	return self._read_sysfs('/sys/class/net/{0}/bridge/priority'
	.format(self._ifname))

	@priority.setter
	def priority(self, priority):
	"""
	Set bridge max aging time in seconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').priority = 8192
	"""
	return self._write_sysfs('/sys/class/net/{0}/bridge/priority'
	.format(self._ifname), priority)

	@property
	def stp_state(self):
	"""
	Get current bridge STP (Spanning Tree) state.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').stp_state
	'0'
	"""

	state = 0
	with open('/sys/class/net/{0}/bridge/stp_state'.format(self._ifname), 'r') as f:
	state = int(f.read().rstrip('\n'))

	return state


	@stp_state.setter
	def stp_state(self, state):
	"""
	Set bridge STP (Spannign Tree) state. 0 -> STP disabled, 1 -> STP enabled

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').stp_state = 1
	"""

	if int(state) >= 0 and int(state) <= 1:
	return self._write_sysfs('/sys/class/net/{0}/bridge/stp_state'
	.format(self._ifname), state)
	else:
	raise ValueError("Value out of range")

	@property
	def multicast_querier(self):
	"""
	Get bridge multicast querier membership state.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').multicast_querier
	'0'
	"""
	return self._read_sysfs('/sys/class/net/{0}/bridge/multicast_querier'
	.format(self._ifname))

	@multicast_querier.setter
	def multicast_querier(self, enable):
	"""
	Sets whether the bridge actively runs a multicast querier or not. When a
	bridge receives a 'multicast host membership' query from another network
	host, that host is tracked based on the time that the query was received
	plus the multicast query interval time.

	Use enable=1 to enable or enable=0 to disable

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').multicast_querier = 1
	"""
	if int(enable) >= 0 and int(enable) <= 1:
	return self._write_sysfs('/sys/class/net/{0}/bridge/multicast_querier'
	.format(self._ifname), enable)
	else:
	raise ValueError("Value out of range")


	def add_port(self, interface):
	"""
	Add physical interface to bridge (member port)

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').add_port('eth0')
	>>> BridgeIf('br0').add_port('eth1')
	"""
	if not interface:
	raise ValueError('No interface address specified')

	cmd = 'ip link set dev "{}" master "{}"'.format(interface, self._ifname)
	self._cmd(cmd)


	def del_port(self, interface):
	"""
	Add bridge member port

	Example:

	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').del_port('eth1')
	"""
	if not interface:
	raise ValueError('No interface address specified')

	cmd = 'ip link set dev "{}" nomaster'.format(interface)
	self._cmd(cmd)


	def set_cost(self, interface, cost):
	"""
	Set interface path cost, only relevant for STP enabled interfaces

	Example:

	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').path_cost(4)
	"""
	return self._write_sysfs('/sys/class/net/{}/brif/{}/path_cost'
	.format(self._ifname, interface), cost)


	def set_priority(self, interface, priority):
	"""
	Set interface path priority, only relevant for STP enabled interfaces

	Example:

	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').priority(4)
	"""
	return self._write_sysfs('/sys/class/net/{}/brif/{}/priority'
	.format(self._ifname, interface), priority)


	class BondIf(Interface):
	def __init__(self, ifname):
	super().__init__(ifname, type='bond')

	@property
	def xmit_hash_policy(self):
	"""
	Selects the transmit hash policy to use for slave selection in
	balance-xor, 802.3ad, and tlb modes. Possible values are: layer2,
	layer2+3, layer3+4, encap2+3, encap3+4.

	The default value is layer2

	Example:
	>>> from vyos.ifconfig import BondIf
	>>> BondIf('bond0').xmit_hash_policy
	'layer3+4'
	"""
	# Linux Kernel appends has policy value to string, e.g. 'layer3+4 1',
	# so remove the later part and only return the mode as string.
	return self._read_sysfs('/sys/class/net/{}/bonding/xmit_hash_policy'
	.format(self._ifname)).split(' ')[0]

	@xmit_hash_policy.setter
	def xmit_hash_policy(self, mode):
	"""
	Selects the transmit hash policy to use for slave selection in
	balance-xor, 802.3ad, and tlb modes. Possible values are: layer2,
	layer2+3, layer3+4, encap2+3, encap3+4.

	The default value is layer2

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BondIf('bond0').xmit_hash_policy = 'layer2+3'
	>>> BondIf('bond0').proxy_arp
	'1'
	"""
	if not mode in ['layer2', 'layer2+3', 'layer3+4', 'encap2+3', 'encap3+4']:
	raise ValueError()
	return self._write_sysfs('/sys/class/net/{}/bonding/xmit_hash_policy'
	.format(self._ifname), mode)

	@property
	def arp_interval(self):
	"""
	Specifies the ARP link monitoring frequency in milliseconds.

	The ARP monitor works by periodically checking the slave devices to
	determine whether they have sent or received traffic recently (the
	precise criteria depends upon the bonding mode, and the state of the
	slave). Regular traffic is generated via ARP probes issued for the
	addresses specified by the arp_ip_target option.

	The default value is 0.

	Example:
	>>> from vyos.ifconfig import BondIf
	>>> BondIf('bond0').arp_interval
	'0'
	"""
	return self._read_sysfs('/sys/class/net/{}/bonding/arp_interval'
	.format(self._ifname))

	@arp_interval.setter
	def arp_interval(self, time):
	"""
	Specifies the IP addresses to use as ARP monitoring peers when
	arp_interval is > 0. These are the targets of the ARP request sent to
	determine the health of the link to the targets. Specify these values
	in ddd.ddd.ddd.ddd format. Multiple IP addresses must be separated by
	a comma. At least one IP address must be given for ARP monitoring to
	function. The maximum number of targets that can be specified is 16.

	The default value is no IP addresses.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BondIf('bond0').arp_interval = '100'
	>>> BondIf('bond0').arp_interval
	'100'
	"""
	return self._write_sysfs('/sys/class/net/{}/bonding/arp_interval'
	.format(self._ifname), time)

	@property
	def arp_ip_target(self):
	"""
	Specifies the IP addresses to use as ARP monitoring peers when
	arp_interval is > 0. These are the targets of the ARP request sent to
	determine the health of the link to the targets. Specify these values
	in ddd.ddd.ddd.ddd format. Multiple IP addresses must be separated by
	a comma. At least one IP address must be given for ARP monitoring to
	function. The maximum number of targets that can be specified is 16.

	The default value is no IP addresses.

	Example:
	>>> from vyos.ifconfig import BondIf
	>>> BondIf('bond0').arp_ip_target
	'192.0.2.1'
	"""
	return self._read_sysfs('/sys/class/net/{}/bonding/arp_ip_target'
	.format(self._ifname))

	@arp_ip_target.setter
	def arp_ip_target(self, target):
	"""
	Specifies the IP addresses to use as ARP monitoring peers when
	arp_interval is > 0. These are the targets of the ARP request sent to
	determine the health of the link to the targets. Specify these values
	in ddd.ddd.ddd.ddd format. Multiple IP addresses must be separated by
	a comma. At least one IP address must be given for ARP monitoring to
	function. The maximum number of targets that can be specified is 16.

	The default value is no IP addresses.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BondIf('bond0').arp_ip_target = '192.0.2.1'
	>>> BondIf('bond0').arp_ip_target
	'192.0.2.1'
	"""
	return self._write_sysfs('/sys/class/net/{}/bonding/arp_ip_target'
	.format(self._ifname), target)

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