test/test_ip4_vrf_multi_instance.py - fdio/vpp - Gitiles

 #!/usr/bin/env python3
 """IP4 VRF Multi-instance Test Case HLD:

 **NOTES:**
     - higher number of pg-ip4 interfaces causes problems => only 15 pg-ip4 \
     interfaces in 5 VRFs are tested
     - jumbo packets in configuration with 15 pg-ip4 interfaces leads to \
     problems too

 **config 1**
     - add 15 pg-ip4 interfaces
     - configure 5 hosts per pg-ip4 interface
     - configure 4 VRFs
     - add 3 pg-ip4 interfaces per VRF

 **test 1**
     - send IP4 packets between all pg-ip4 interfaces in all VRF groups

 **verify 1**
     - check VRF data by parsing output of ip_fib_dump API command
     - all packets received correctly in case of pg-ip4 interfaces in the same
     VRF
     - no packet received in case of pg-ip4 interfaces not in VRF
     - no packet received in case of pg-ip4 interfaces in different VRFs

 **config 2**
     - reset 2 VRFs

 **test 2**
     - send IP4 packets between all pg-ip4 interfaces in all VRF groups

 **verify 2**
     - all packets received correctly in case of pg-ip4 interfaces in the same
     VRF
     - no packet received in case of pg-ip4 interfaces not in VRF
     - no packet received in case of pg-ip4 interfaces in different VRFs

 **config 3**
     - add 1 of reset VRFs and 1 new VRF

 **test 3**
     - send IP4 packets between all pg-ip4 interfaces in all VRF groups

 **verify 3**
     - check VRF data by parsing output of ip_fib_dump API command
     - all packets received correctly in case of pg-ip4 interfaces in the same
     VRF
     - no packet received in case of pg-ip4 interfaces not in VRF
     - no packet received in case of pg-ip4 interfaces in different VRFs

 **config 4**
     - reset all created VRFs

 **test 4**
     - send IP4 packets between all pg-ip4 interfaces in all VRF groups

 **verify 4**
     - check VRF data by parsing output of ip_fib_dump API command
     - all packets received correctly in case of pg-ip4 interfaces in the same
     VRF
     - no packet received in case of pg-ip4 interfaces not in VRF
     - no packet received in case of pg-ip4 interfaces in different VRFs
 """

 import unittest
 import random
 import socket

 import scapy.compat
 from scapy.packet import Raw
 from scapy.layers.l2 import Ether
 from scapy.layers.inet import IP, UDP, ARP

 from framework import VppTestCase, VppTestRunner
 from util import ppp
 from vrf import VRFState


 def is_ipv4_misc(p):
     """ Is packet one of uninteresting IPv4 broadcasts? """
     if p.haslayer(ARP):
         return True
     return False


 class TestIp4VrfMultiInst(VppTestCase):
     """ IP4 VRF  Multi-instance Test Case """

     @classmethod
     def setUpClass(cls):
         """
         Perform standard class setup (defined by class method setUpClass in
         class VppTestCase) before running the test case, set test case related
         variables and configure VPP.
         """
         super(TestIp4VrfMultiInst, cls).setUpClass()

         # Test variables
         cls.hosts_per_pg = 5
         cls.nr_of_vrfs = 5
         cls.pg_ifs_per_vrf = 3

         try:
             # Create pg interfaces
             cls.create_pg_interfaces(
                 range(cls.nr_of_vrfs * cls.pg_ifs_per_vrf))

             # Packet flows mapping pg0 -> pg1, pg2 etc.
             cls.flows = dict()
             for i in range(len(cls.pg_interfaces)):
                 multiplicand = i // cls.pg_ifs_per_vrf
                 pg_list = [
                     cls.pg_interfaces[multiplicand * cls.pg_ifs_per_vrf + j]
                     for j in range(cls.pg_ifs_per_vrf)
                     if (multiplicand * cls.pg_ifs_per_vrf + j) != i]
                 cls.flows[cls.pg_interfaces[i]] = pg_list

             # Packet sizes - jumbo packet (9018 bytes) skipped
             cls.pg_if_packet_sizes = [64, 512, 1518]

             # Set up all interfaces
             for pg_if in cls.pg_interfaces:
                 pg_if.admin_up()
                 pg_if.generate_remote_hosts(cls.hosts_per_pg)

             # Create list of VRFs
             cls.vrf_list = list()

             # Create list of reset VRFs
             cls.vrf_reset_list = list()

             # Create list of pg_interfaces in VRFs
             cls.pg_in_vrf = list()

             # Create list of pg_interfaces not in VRFs
             cls.pg_not_in_vrf = [pg_if for pg_if in cls.pg_interfaces]

             # Create mapping of pg_interfaces to VRF IDs
             cls.pg_if_by_vrf_id = dict()
             for i in range(cls.nr_of_vrfs):
                 vrf_id = i + 1
                 pg_list = [
                     cls.pg_interfaces[i * cls.pg_ifs_per_vrf + j]
                     for j in range(cls.pg_ifs_per_vrf)]
                 cls.pg_if_by_vrf_id[vrf_id] = pg_list

         except Exception:
             super(TestIp4VrfMultiInst, cls).tearDownClass()
             raise

     @classmethod
     def tearDownClass(cls):
         super(TestIp4VrfMultiInst, cls).tearDownClass()

     def setUp(self):
         """
         Clear trace and packet infos before running each test.
         """
         super(TestIp4VrfMultiInst, self).setUp()
         self.reset_packet_infos()

     def tearDown(self):
         """
         Show various debug prints after each test.
         """
         super(TestIp4VrfMultiInst, self).tearDown()

     def show_commands_at_teardown(self):
         self.logger.info(self.vapi.ppcli("show ip fib"))
         self.logger.info(self.vapi.ppcli("show ip arp"))

     def create_vrf_and_assign_interfaces(self, count, start=1):
         """
         Create required number of FIB tables / VRFs, put 3 pg-ip4 interfaces
         to every FIB table / VRF.

         :param int count: Number of FIB tables / VRFs to be created.
         :param int start: Starting number of the FIB table / VRF ID. \
         (Default value = 1)
         """

         for i in range(count):
             vrf_id = i + start
             pg_if = self.pg_if_by_vrf_id[vrf_id][0]
             dest_addr = pg_if.local_ip4n
             dest_addr_len = 24
             self.vapi.ip_table_add_del(is_add=1, table_id=vrf_id)
             self.logger.info("IPv4 VRF ID %d created" % vrf_id)
             if vrf_id not in self.vrf_list:
                 self.vrf_list.append(vrf_id)
             if vrf_id in self.vrf_reset_list:
                 self.vrf_reset_list.remove(vrf_id)
             for j in range(self.pg_ifs_per_vrf):
                 pg_if = self.pg_if_by_vrf_id[vrf_id][j]
                 pg_if.set_table_ip4(vrf_id)
                 self.logger.info("pg-interface %s added to IPv4 VRF ID %d"
                                  % (pg_if.name, vrf_id))
                 if pg_if not in self.pg_in_vrf:
                     self.pg_in_vrf.append(pg_if)
                 if pg_if in self.pg_not_in_vrf:
                     self.pg_not_in_vrf.remove(pg_if)
                 pg_if.config_ip4()
                 pg_if.configure_ipv4_neighbors()
         self.logger.debug(self.vapi.ppcli("show ip fib"))
         self.logger.debug(self.vapi.ppcli("show ip arp"))

     def reset_vrf_and_remove_from_vrf_list(self, vrf_id):
         """
         Reset required FIB table / VRF and remove it from VRF list.

         :param int vrf_id: The FIB table / VRF ID to be reset.
         """
         # self.vapi.reset_vrf(vrf_id, is_ipv6=0)
         self.vapi.reset_fib(vrf_id, is_ipv6=0)
         if vrf_id in self.vrf_list:
             self.vrf_list.remove(vrf_id)
         if vrf_id not in self.vrf_reset_list:
             self.vrf_reset_list.append(vrf_id)
         for j in range(self.pg_ifs_per_vrf):
             pg_if = self.pg_if_by_vrf_id[vrf_id][j]
             pg_if.unconfig_ip4()
             if pg_if in self.pg_in_vrf:
                 self.pg_in_vrf.remove(pg_if)
             if pg_if not in self.pg_not_in_vrf:
                 self.pg_not_in_vrf.append(pg_if)
         self.logger.info("IPv4 VRF ID %d reset finished" % vrf_id)
         self.logger.debug(self.vapi.ppcli("show ip fib"))
         self.logger.debug(self.vapi.ppcli("show ip arp"))
         self.vapi.ip_table_add_del(is_add=0, table_id=vrf_id)

     def create_stream(self, src_if, packet_sizes):
         """
         Create input packet stream for defined interface using hosts list.

         :param object src_if: Interface to create packet stream for.
         :param list packet_sizes: List of required packet sizes.
         :return: Stream of packets.
         """
         pkts = []
         src_hosts = src_if.remote_hosts
         for dst_if in self.flows[src_if]:
             for dst_host in dst_if.remote_hosts:
                 src_host = random.choice(src_hosts)
                 pkt_info = self.create_packet_info(src_if, dst_if)
                 payload = self.info_to_payload(pkt_info)
                 p = (Ether(dst=src_if.local_mac, src=src_host.mac) /
                      IP(src=src_host.ip4, dst=dst_host.ip4) /
                      UDP(sport=1234, dport=1234) /
                      Raw(payload))
                 pkt_info.data = p.copy()
                 size = random.choice(packet_sizes)
                 self.extend_packet(p, size)
                 pkts.append(p)
         self.logger.debug("Input stream created for port %s. Length: %u pkt(s)"
                           % (src_if.name, len(pkts)))
         return pkts

     def create_stream_crosswise_vrf(self, src_if, vrf_id, packet_sizes):
         """
         Create input packet stream for negative test for leaking across
         different VRFs for defined interface using hosts list.

         :param object src_if: Interface to create packet stream for.
         :param int vrf_id: The FIB table / VRF ID where src_if is assigned.
         :param list packet_sizes: List of required packet sizes.
         :return: Stream of packets.
         """
         pkts = []
         src_hosts = src_if.remote_hosts
         vrf_lst = list(self.vrf_list)
         vrf_lst.remove(vrf_id)
         for vrf in vrf_lst:
             for dst_if in self.pg_if_by_vrf_id[vrf]:
                 for dst_host in dst_if.remote_hosts:
                     src_host = random.choice(src_hosts)
                     pkt_info = self.create_packet_info(src_if, dst_if)
                     payload = self.info_to_payload(pkt_info)
                     p = (Ether(dst=src_if.local_mac, src=src_host.mac) /
                          IP(src=src_host.ip4, dst=dst_host.ip4) /
                          UDP(sport=1234, dport=1234) /
                          Raw(payload))
                     pkt_info.data = p.copy()
                     size = random.choice(packet_sizes)
                     self.extend_packet(p, size)
                     pkts.append(p)
         self.logger.debug("Input stream created for port %s. Length: %u pkt(s)"
                           % (src_if.name, len(pkts)))
         return pkts

     def verify_capture(self, pg_if, capture):
         """
         Verify captured input packet stream for defined interface.

         :param object pg_if: Interface to verify captured packet stream for.
         :param list capture: Captured packet stream.
         """
         last_info = dict()
         for i in self.pg_interfaces:
             last_info[i.sw_if_index] = None
         dst_sw_if_index = pg_if.sw_if_index
         for packet in capture:
             try:
                 ip = packet[IP]
                 udp = packet[UDP]
                 payload_info = self.payload_to_info(packet[Raw])
                 packet_index = payload_info.index
                 self.assertEqual(payload_info.dst, dst_sw_if_index)
                 self.logger.debug("Got packet on port %s: src=%u (id=%u)" %
                                   (pg_if.name, payload_info.src, packet_index))
                 next_info = self.get_next_packet_info_for_interface2(
                     payload_info.src, dst_sw_if_index,
                     last_info[payload_info.src])
                 last_info[payload_info.src] = next_info
                 self.assertIsNotNone(next_info)
                 self.assertEqual(packet_index, next_info.index)
                 saved_packet = next_info.data
                 # Check standard fields
                 self.assertEqual(ip.src, saved_packet[IP].src)
                 self.assertEqual(ip.dst, saved_packet[IP].dst)
                 self.assertEqual(udp.sport, saved_packet[UDP].sport)
                 self.assertEqual(udp.dport, saved_packet[UDP].dport)
             except:
                 self.logger.error(ppp("Unexpected or invalid packet:", packet))
                 raise
         for i in self.pg_interfaces:
             remaining_packet = self.get_next_packet_info_for_interface2(
                 i, dst_sw_if_index, last_info[i.sw_if_index])
             self.assertIsNone(
                 remaining_packet,
                 "Port %u: Packet expected from source %u didn't arrive" %
                 (dst_sw_if_index, i.sw_if_index))

     def verify_vrf(self, vrf_id):
         """
         Check if the FIB table / VRF ID is configured.

         :param int vrf_id: The FIB table / VRF ID to be verified.
         :return: 1 if the FIB table / VRF ID is configured, otherwise return 0.
         """
         ip_fib_dump = self.vapi.ip_route_dump(vrf_id)
         vrf_exist = len(ip_fib_dump)
         vrf_count = 0
         for ip_fib_details in ip_fib_dump:
             addr = ip_fib_details.route.prefix.network_address
             found = False
             for pg_if in self.pg_if_by_vrf_id[vrf_id]:
                 if found:
                     break
                 for host in pg_if.remote_hosts:
                     if str(addr) == host.ip4:
                         vrf_count += 1
                         found = True
                         break
         if not vrf_exist and vrf_count == 0:
             self.logger.info("IPv4 VRF ID %d is not configured" % vrf_id)
             return VRFState.not_configured
         elif vrf_exist and vrf_count == 0:
             self.logger.info("IPv4 VRF ID %d has been reset" % vrf_id)
             return VRFState.reset
         else:
             self.logger.info("IPv4 VRF ID %d is configured" % vrf_id)
             return VRFState.configured

     def run_verify_test(self):
         """
         Create packet streams for all configured pg interfaces, send all \
         prepared packet streams and verify that:
             - all packets received correctly on all pg-ip4 interfaces assigned
               to VRFs
             - no packet received on all pg-ip4 interfaces not assigned to VRFs

         :raise RuntimeError: If no packet captured on pg-ip4 interface assigned
             to VRF or if any packet is captured on pg-ip4 interface not
             assigned to VRF.
         """
         # Test
         # Create incoming packet streams for packet-generator interfaces
         for pg_if in self.pg_interfaces:
             pkts = self.create_stream(pg_if, self.pg_if_packet_sizes)
             pg_if.add_stream(pkts)

         # Enable packet capture and start packet sending
         self.pg_enable_capture(self.pg_interfaces)
         self.pg_start()

         # Verify
         # Verify outgoing packet streams per packet-generator interface
         for pg_if in self.pg_interfaces:
             if pg_if in self.pg_in_vrf:
                 capture = pg_if.get_capture(remark="interface is in VRF")
                 self.verify_capture(pg_if, capture)
             elif pg_if in self.pg_not_in_vrf:
                 pg_if.assert_nothing_captured(remark="interface is not in VRF",
                                               filter_out_fn=is_ipv4_misc)
                 self.logger.debug("No capture for interface %s" % pg_if.name)
             else:
                 raise Exception("Unknown interface: %s" % pg_if.name)

     def run_crosswise_vrf_test(self):
         """
         Create packet streams for every pg-ip4 interface in VRF towards all
         pg-ip4 interfaces in other VRFs, send all prepared packet streams and \
         verify that:
              - no packet received on all configured pg-ip4 interfaces

         :raise RuntimeError: If any packet is captured on any pg-ip4 interface.
         """
         # Test
         # Create incoming packet streams for packet-generator interfaces
         for vrf_id in self.vrf_list:
             for pg_if in self.pg_if_by_vrf_id[vrf_id]:
                 pkts = self.create_stream_crosswise_vrf(
                     pg_if, vrf_id, self.pg_if_packet_sizes)
                 pg_if.add_stream(pkts)

         # Enable packet capture and start packet sending
         self.pg_enable_capture(self.pg_interfaces)
         self.pg_start()

         # Verify
         # Verify outgoing packet streams per packet-generator interface
         for pg_if in self.pg_interfaces:
             pg_if.assert_nothing_captured(remark="interface is in other VRF",
                                           filter_out_fn=is_ipv4_misc)
             self.logger.debug("No capture for interface %s" % pg_if.name)

     def test_ip4_vrf_01(self):
         """ IP4 VRF  Multi-instance test 1 - create 4 VRFs
         """
         # Config 1
         # Create 4 VRFs
         self.create_vrf_and_assign_interfaces(4)

         # Verify 1
         for vrf_id in self.vrf_list:
             self.assert_equal(self.verify_vrf(vrf_id),
                               VRFState.configured, VRFState)

         # Test 1
         self.run_verify_test()
         self.run_crosswise_vrf_test()

     def test_ip4_vrf_02(self):
         """ IP4 VRF  Multi-instance test 2 - reset 2 VRFs
         """
         # Config 2
         # Reset 2 VRFs
         self.reset_vrf_and_remove_from_vrf_list(1)
         self.reset_vrf_and_remove_from_vrf_list(2)

         # Verify 2
         for vrf_id in self.vrf_reset_list:
             self.assert_equal(self.verify_vrf(vrf_id),
                               VRFState.reset, VRFState)
         for vrf_id in self.vrf_list:
             self.assert_equal(self.verify_vrf(vrf_id),
                               VRFState.configured, VRFState)

         # Test 2
         self.run_verify_test()
         self.run_crosswise_vrf_test()

     def test_ip4_vrf_03(self):
         """ IP4 VRF  Multi-instance 3 - add 2 VRFs
         """
         # Config 3
         # Add 1 of reset VRFs and 1 new VRF
         self.create_vrf_and_assign_interfaces(1)
         self.create_vrf_and_assign_interfaces(1, start=5)

         # Verify 3
         for vrf_id in self.vrf_reset_list:
             self.assert_equal(self.verify_vrf(vrf_id),
                               VRFState.reset, VRFState)
         for vrf_id in self.vrf_list:
             self.assert_equal(self.verify_vrf(vrf_id),
                               VRFState.configured, VRFState)

         # Test 3
         self.run_verify_test()
         self.run_crosswise_vrf_test()

     def test_ip4_vrf_04(self):
         """ IP4 VRF  Multi-instance test 4 - reset 4 VRFs
         """
         # Config 4
         # Reset all VRFs (i.e. no VRF except VRF=0 configured)
         for i in range(len(self.vrf_list)):
             self.reset_vrf_and_remove_from_vrf_list(self.vrf_list[0])

         # Verify 4
         for vrf_id in self.vrf_reset_list:
             self.assert_equal(self.verify_vrf(vrf_id),
                               VRFState.reset, VRFState)
         vrf_list_length = len(self.vrf_list)
         self.assertEqual(
             vrf_list_length, 0,
             "List of configured VRFs is not empty: %s != 0" % vrf_list_length)

         # Test 4
         self.run_verify_test()
         self.run_crosswise_vrf_test()


 if __name__ == '__main__':
     unittest.main(testRunner=VppTestRunner)
	#!/usr/bin/env python3
	"""IP4 VRF Multi-instance Test Case HLD:

	NOTES:
	- higher number of pg-ip4 interfaces causes problems => only 15 pg-ip4 \
	interfaces in 5 VRFs are tested
	- jumbo packets in configuration with 15 pg-ip4 interfaces leads to \
	problems too

	config 1
	- add 15 pg-ip4 interfaces
	- configure 5 hosts per pg-ip4 interface
	- configure 4 VRFs
	- add 3 pg-ip4 interfaces per VRF

	test 1
	- send IP4 packets between all pg-ip4 interfaces in all VRF groups

	verify 1
	- check VRF data by parsing output of ip_fib_dump API command
	- all packets received correctly in case of pg-ip4 interfaces in the same
	VRF
	- no packet received in case of pg-ip4 interfaces not in VRF
	- no packet received in case of pg-ip4 interfaces in different VRFs

	config 2
	- reset 2 VRFs

	test 2
	- send IP4 packets between all pg-ip4 interfaces in all VRF groups

	verify 2
	- all packets received correctly in case of pg-ip4 interfaces in the same
	VRF
	- no packet received in case of pg-ip4 interfaces not in VRF
	- no packet received in case of pg-ip4 interfaces in different VRFs

	config 3
	- add 1 of reset VRFs and 1 new VRF

	test 3
	- send IP4 packets between all pg-ip4 interfaces in all VRF groups

	verify 3
	- check VRF data by parsing output of ip_fib_dump API command
	- all packets received correctly in case of pg-ip4 interfaces in the same
	VRF
	- no packet received in case of pg-ip4 interfaces not in VRF
	- no packet received in case of pg-ip4 interfaces in different VRFs

	config 4
	- reset all created VRFs

	test 4
	- send IP4 packets between all pg-ip4 interfaces in all VRF groups

	verify 4
	- check VRF data by parsing output of ip_fib_dump API command
	- all packets received correctly in case of pg-ip4 interfaces in the same
	VRF
	- no packet received in case of pg-ip4 interfaces not in VRF
	- no packet received in case of pg-ip4 interfaces in different VRFs
	"""

	import unittest
	import random
	import socket

	import scapy.compat
	from scapy.packet import Raw
	from scapy.layers.l2 import Ether
	from scapy.layers.inet import IP, UDP, ARP

	from framework import VppTestCase, VppTestRunner
	from util import ppp
	from vrf import VRFState


	def is_ipv4_misc(p):
	""" Is packet one of uninteresting IPv4 broadcasts? """
	if p.haslayer(ARP):
	return True
	return False


	class TestIp4VrfMultiInst(VppTestCase):
	""" IP4 VRF Multi-instance Test Case """

	@classmethod
	def setUpClass(cls):
	"""
	Perform standard class setup (defined by class method setUpClass in
	class VppTestCase) before running the test case, set test case related
	variables and configure VPP.
	"""
	super(TestIp4VrfMultiInst, cls).setUpClass()

	# Test variables
	cls.hosts_per_pg = 5
	cls.nr_of_vrfs = 5
	cls.pg_ifs_per_vrf = 3

	try:
	# Create pg interfaces
	cls.create_pg_interfaces(
	range(cls.nr_of_vrfs * cls.pg_ifs_per_vrf))

	# Packet flows mapping pg0 -> pg1, pg2 etc.
	cls.flows = dict()
	for i in range(len(cls.pg_interfaces)):
	multiplicand = i // cls.pg_ifs_per_vrf
	pg_list = [
	cls.pg_interfaces[multiplicand * cls.pg_ifs_per_vrf + j]
	for j in range(cls.pg_ifs_per_vrf)
	if (multiplicand * cls.pg_ifs_per_vrf + j) != i]
	cls.flows[cls.pg_interfaces[i]] = pg_list

	# Packet sizes - jumbo packet (9018 bytes) skipped
	cls.pg_if_packet_sizes = [64, 512, 1518]

	# Set up all interfaces
	for pg_if in cls.pg_interfaces:
	pg_if.admin_up()
	pg_if.generate_remote_hosts(cls.hosts_per_pg)

	# Create list of VRFs
	cls.vrf_list = list()

	# Create list of reset VRFs
	cls.vrf_reset_list = list()

	# Create list of pg_interfaces in VRFs
	cls.pg_in_vrf = list()

	# Create list of pg_interfaces not in VRFs
	cls.pg_not_in_vrf = [pg_if for pg_if in cls.pg_interfaces]

	# Create mapping of pg_interfaces to VRF IDs
	cls.pg_if_by_vrf_id = dict()
	for i in range(cls.nr_of_vrfs):
	vrf_id = i + 1
	pg_list = [
	cls.pg_interfaces[i * cls.pg_ifs_per_vrf + j]
	for j in range(cls.pg_ifs_per_vrf)]
	cls.pg_if_by_vrf_id[vrf_id] = pg_list

	except Exception:
	super(TestIp4VrfMultiInst, cls).tearDownClass()
	raise

	@classmethod
	def tearDownClass(cls):
	super(TestIp4VrfMultiInst, cls).tearDownClass()

	def setUp(self):
	"""
	Clear trace and packet infos before running each test.
	"""
	super(TestIp4VrfMultiInst, self).setUp()
	self.reset_packet_infos()

	def tearDown(self):
	"""
	Show various debug prints after each test.
	"""
	super(TestIp4VrfMultiInst, self).tearDown()

	def show_commands_at_teardown(self):
	self.logger.info(self.vapi.ppcli("show ip fib"))
	self.logger.info(self.vapi.ppcli("show ip arp"))

	def create_vrf_and_assign_interfaces(self, count, start=1):
	"""
	Create required number of FIB tables / VRFs, put 3 pg-ip4 interfaces
	to every FIB table / VRF.

	:param int count: Number of FIB tables / VRFs to be created.
	:param int start: Starting number of the FIB table / VRF ID. \
	(Default value = 1)
	"""

	for i in range(count):
	vrf_id = i + start
	pg_if = self.pg_if_by_vrf_id[vrf_id][0]
	dest_addr = pg_if.local_ip4n
	dest_addr_len = 24
	self.vapi.ip_table_add_del(is_add=1, table_id=vrf_id)
	self.logger.info("IPv4 VRF ID %d created" % vrf_id)
	if vrf_id not in self.vrf_list:
	self.vrf_list.append(vrf_id)
	if vrf_id in self.vrf_reset_list:
	self.vrf_reset_list.remove(vrf_id)
	for j in range(self.pg_ifs_per_vrf):
	pg_if = self.pg_if_by_vrf_id[vrf_id][j]
	pg_if.set_table_ip4(vrf_id)
	self.logger.info("pg-interface %s added to IPv4 VRF ID %d"
	% (pg_if.name, vrf_id))
	if pg_if not in self.pg_in_vrf:
	self.pg_in_vrf.append(pg_if)
	if pg_if in self.pg_not_in_vrf:
	self.pg_not_in_vrf.remove(pg_if)
	pg_if.config_ip4()
	pg_if.configure_ipv4_neighbors()
	self.logger.debug(self.vapi.ppcli("show ip fib"))
	self.logger.debug(self.vapi.ppcli("show ip arp"))

	def reset_vrf_and_remove_from_vrf_list(self, vrf_id):
	"""
	Reset required FIB table / VRF and remove it from VRF list.

	:param int vrf_id: The FIB table / VRF ID to be reset.
	"""
	# self.vapi.reset_vrf(vrf_id, is_ipv6=0)
	self.vapi.reset_fib(vrf_id, is_ipv6=0)
	if vrf_id in self.vrf_list:
	self.vrf_list.remove(vrf_id)
	if vrf_id not in self.vrf_reset_list:
	self.vrf_reset_list.append(vrf_id)
	for j in range(self.pg_ifs_per_vrf):
	pg_if = self.pg_if_by_vrf_id[vrf_id][j]
	pg_if.unconfig_ip4()
	if pg_if in self.pg_in_vrf:
	self.pg_in_vrf.remove(pg_if)
	if pg_if not in self.pg_not_in_vrf:
	self.pg_not_in_vrf.append(pg_if)
	self.logger.info("IPv4 VRF ID %d reset finished" % vrf_id)
	self.logger.debug(self.vapi.ppcli("show ip fib"))
	self.logger.debug(self.vapi.ppcli("show ip arp"))
	self.vapi.ip_table_add_del(is_add=0, table_id=vrf_id)

	def create_stream(self, src_if, packet_sizes):
	"""
	Create input packet stream for defined interface using hosts list.

	:param object src_if: Interface to create packet stream for.
	:param list packet_sizes: List of required packet sizes.
	:return: Stream of packets.
	"""
	pkts = []
	src_hosts = src_if.remote_hosts
	for dst_if in self.flows[src_if]:
	for dst_host in dst_if.remote_hosts:
	src_host = random.choice(src_hosts)
	pkt_info = self.create_packet_info(src_if, dst_if)
	payload = self.info_to_payload(pkt_info)
	p = (Ether(dst=src_if.local_mac, src=src_host.mac) /
	IP(src=src_host.ip4, dst=dst_host.ip4) /
	UDP(sport=1234, dport=1234) /
	Raw(payload))
	pkt_info.data = p.copy()
	size = random.choice(packet_sizes)
	self.extend_packet(p, size)
	pkts.append(p)
	self.logger.debug("Input stream created for port %s. Length: %u pkt(s)"
	% (src_if.name, len(pkts)))
	return pkts

	def create_stream_crosswise_vrf(self, src_if, vrf_id, packet_sizes):
	"""
	Create input packet stream for negative test for leaking across
	different VRFs for defined interface using hosts list.

	:param object src_if: Interface to create packet stream for.
	:param int vrf_id: The FIB table / VRF ID where src_if is assigned.
	:param list packet_sizes: List of required packet sizes.
	:return: Stream of packets.
	"""
	pkts = []
	src_hosts = src_if.remote_hosts
	vrf_lst = list(self.vrf_list)
	vrf_lst.remove(vrf_id)
	for vrf in vrf_lst:
	for dst_if in self.pg_if_by_vrf_id[vrf]:
	for dst_host in dst_if.remote_hosts:
	src_host = random.choice(src_hosts)
	pkt_info = self.create_packet_info(src_if, dst_if)
	payload = self.info_to_payload(pkt_info)
	p = (Ether(dst=src_if.local_mac, src=src_host.mac) /
	IP(src=src_host.ip4, dst=dst_host.ip4) /
	UDP(sport=1234, dport=1234) /
	Raw(payload))
	pkt_info.data = p.copy()
	size = random.choice(packet_sizes)
	self.extend_packet(p, size)
	pkts.append(p)
	self.logger.debug("Input stream created for port %s. Length: %u pkt(s)"
	% (src_if.name, len(pkts)))
	return pkts

	def verify_capture(self, pg_if, capture):
	"""
	Verify captured input packet stream for defined interface.

	:param object pg_if: Interface to verify captured packet stream for.
	:param list capture: Captured packet stream.
	"""
	last_info = dict()
	for i in self.pg_interfaces:
	last_info[i.sw_if_index] = None
	dst_sw_if_index = pg_if.sw_if_index
	for packet in capture:
	try:
	ip = packet[IP]
	udp = packet[UDP]
	payload_info = self.payload_to_info(packet[Raw])
	packet_index = payload_info.index
	self.assertEqual(payload_info.dst, dst_sw_if_index)
	self.logger.debug("Got packet on port %s: src=%u (id=%u)" %
	(pg_if.name, payload_info.src, packet_index))
	next_info = self.get_next_packet_info_for_interface2(
	payload_info.src, dst_sw_if_index,
	last_info[payload_info.src])
	last_info[payload_info.src] = next_info
	self.assertIsNotNone(next_info)
	self.assertEqual(packet_index, next_info.index)
	saved_packet = next_info.data
	# Check standard fields
	self.assertEqual(ip.src, saved_packet[IP].src)
	self.assertEqual(ip.dst, saved_packet[IP].dst)
	self.assertEqual(udp.sport, saved_packet[UDP].sport)
	self.assertEqual(udp.dport, saved_packet[UDP].dport)
	except:
	self.logger.error(ppp("Unexpected or invalid packet:", packet))
	raise
	for i in self.pg_interfaces:
	remaining_packet = self.get_next_packet_info_for_interface2(
	i, dst_sw_if_index, last_info[i.sw_if_index])
	self.assertIsNone(
	remaining_packet,
	"Port %u: Packet expected from source %u didn't arrive" %
	(dst_sw_if_index, i.sw_if_index))

	def verify_vrf(self, vrf_id):
	"""
	Check if the FIB table / VRF ID is configured.

	:param int vrf_id: The FIB table / VRF ID to be verified.
	:return: 1 if the FIB table / VRF ID is configured, otherwise return 0.
	"""
	ip_fib_dump = self.vapi.ip_route_dump(vrf_id)
	vrf_exist = len(ip_fib_dump)
	vrf_count = 0
	for ip_fib_details in ip_fib_dump:
	addr = ip_fib_details.route.prefix.network_address
	found = False
	for pg_if in self.pg_if_by_vrf_id[vrf_id]:
	if found:
	break
	for host in pg_if.remote_hosts:
	if str(addr) == host.ip4:
	vrf_count += 1
	found = True
	break
	if not vrf_exist and vrf_count == 0:
	self.logger.info("IPv4 VRF ID %d is not configured" % vrf_id)
	return VRFState.not_configured
	elif vrf_exist and vrf_count == 0:
	self.logger.info("IPv4 VRF ID %d has been reset" % vrf_id)
	return VRFState.reset
	else:
	self.logger.info("IPv4 VRF ID %d is configured" % vrf_id)
	return VRFState.configured

	def run_verify_test(self):
	"""
	Create packet streams for all configured pg interfaces, send all \
	prepared packet streams and verify that:
	- all packets received correctly on all pg-ip4 interfaces assigned
	to VRFs
	- no packet received on all pg-ip4 interfaces not assigned to VRFs

	:raise RuntimeError: If no packet captured on pg-ip4 interface assigned
	to VRF or if any packet is captured on pg-ip4 interface not
	assigned to VRF.
	"""
	# Test
	# Create incoming packet streams for packet-generator interfaces
	for pg_if in self.pg_interfaces:
	pkts = self.create_stream(pg_if, self.pg_if_packet_sizes)
	pg_if.add_stream(pkts)

	# Enable packet capture and start packet sending
	self.pg_enable_capture(self.pg_interfaces)
	self.pg_start()

	# Verify
	# Verify outgoing packet streams per packet-generator interface
	for pg_if in self.pg_interfaces:
	if pg_if in self.pg_in_vrf:
	capture = pg_if.get_capture(remark="interface is in VRF")
	self.verify_capture(pg_if, capture)
	elif pg_if in self.pg_not_in_vrf:
	pg_if.assert_nothing_captured(remark="interface is not in VRF",
	filter_out_fn=is_ipv4_misc)
	self.logger.debug("No capture for interface %s" % pg_if.name)
	else:
	raise Exception("Unknown interface: %s" % pg_if.name)

	def run_crosswise_vrf_test(self):
	"""
	Create packet streams for every pg-ip4 interface in VRF towards all
	pg-ip4 interfaces in other VRFs, send all prepared packet streams and \
	verify that:
	- no packet received on all configured pg-ip4 interfaces

	:raise RuntimeError: If any packet is captured on any pg-ip4 interface.
	"""
	# Test
	# Create incoming packet streams for packet-generator interfaces
	for vrf_id in self.vrf_list:
	for pg_if in self.pg_if_by_vrf_id[vrf_id]:
	pkts = self.create_stream_crosswise_vrf(
	pg_if, vrf_id, self.pg_if_packet_sizes)
	pg_if.add_stream(pkts)

	# Enable packet capture and start packet sending
	self.pg_enable_capture(self.pg_interfaces)
	self.pg_start()

	# Verify
	# Verify outgoing packet streams per packet-generator interface
	for pg_if in self.pg_interfaces:
	pg_if.assert_nothing_captured(remark="interface is in other VRF",
	filter_out_fn=is_ipv4_misc)
	self.logger.debug("No capture for interface %s" % pg_if.name)

	def test_ip4_vrf_01(self):
	""" IP4 VRF Multi-instance test 1 - create 4 VRFs
	"""
	# Config 1
	# Create 4 VRFs
	self.create_vrf_and_assign_interfaces(4)

	# Verify 1
	for vrf_id in self.vrf_list:
	self.assert_equal(self.verify_vrf(vrf_id),
	VRFState.configured, VRFState)

	# Test 1
	self.run_verify_test()
	self.run_crosswise_vrf_test()

	def test_ip4_vrf_02(self):
	""" IP4 VRF Multi-instance test 2 - reset 2 VRFs
	"""
	# Config 2
	# Reset 2 VRFs
	self.reset_vrf_and_remove_from_vrf_list(1)
	self.reset_vrf_and_remove_from_vrf_list(2)

	# Verify 2
	for vrf_id in self.vrf_reset_list:
	self.assert_equal(self.verify_vrf(vrf_id),
	VRFState.reset, VRFState)
	for vrf_id in self.vrf_list:
	self.assert_equal(self.verify_vrf(vrf_id),
	VRFState.configured, VRFState)

	# Test 2
	self.run_verify_test()
	self.run_crosswise_vrf_test()

	def test_ip4_vrf_03(self):
	""" IP4 VRF Multi-instance 3 - add 2 VRFs
	"""
	# Config 3
	# Add 1 of reset VRFs and 1 new VRF
	self.create_vrf_and_assign_interfaces(1)
	self.create_vrf_and_assign_interfaces(1, start=5)

	# Verify 3
	for vrf_id in self.vrf_reset_list:
	self.assert_equal(self.verify_vrf(vrf_id),
	VRFState.reset, VRFState)
	for vrf_id in self.vrf_list:
	self.assert_equal(self.verify_vrf(vrf_id),
	VRFState.configured, VRFState)

	# Test 3
	self.run_verify_test()
	self.run_crosswise_vrf_test()

	def test_ip4_vrf_04(self):
	""" IP4 VRF Multi-instance test 4 - reset 4 VRFs
	"""
	# Config 4
	# Reset all VRFs (i.e. no VRF except VRF=0 configured)
	for i in range(len(self.vrf_list)):
	self.reset_vrf_and_remove_from_vrf_list(self.vrf_list[0])

	# Verify 4
	for vrf_id in self.vrf_reset_list:
	self.assert_equal(self.verify_vrf(vrf_id),
	VRFState.reset, VRFState)
	vrf_list_length = len(self.vrf_list)
	self.assertEqual(
	vrf_list_length, 0,
	"List of configured VRFs is not empty: %s != 0" % vrf_list_length)

	# Test 4
	self.run_verify_test()
	self.run_crosswise_vrf_test()


	if __name__ == '__main__':
	unittest.main(testRunner=VppTestRunner)