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#!/usr/bin/env python3
import unittest
import random
from scapy.packet import Raw
from scapy.layers.l2 import Ether
from scapy.layers.inet import IP, UDP
from framework import VppTestCase, VppTestRunner, running_extended_tests
from util import Host, ppp
class TestL2LearnLimit(VppTestCase):
""" L2 Learn limit Test Case """
@classmethod
def setUpClass(self):
super(TestL2LearnLimit, self).setUpClass()
self.create_pg_interfaces(range(3))
@classmethod
def tearDownClass(cls):
super(TestL2LearnLimit, cls).tearDownClass()
def create_hosts(self, pg_if, n_hosts_per_if, subnet):
"""
Create required number of host MAC addresses and distribute them among
interfaces. Create host IPv4 address for every host MAC address.
:param int n_hosts_per_if: Number of per interface hosts to
create MAC/IPv4 addresses for.
"""
hosts = dict()
swif = pg_if.sw_if_index
def mac(j): return "00:00:%02x:ff:%02x:%02x" % (subnet, swif, j)
def ip(j): return "172.%02u.1%02x.%u" % (subnet, swif, j)
def h(j): return Host(mac(j), ip(j))
hosts[swif] = [h(j) for j in range(n_hosts_per_if)]
return hosts
def learn_hosts(self, pg_if, bd_id, hosts):
"""
Create and send per interface L2 MAC broadcast packet stream to
let the bridge domain learn these MAC addresses.
:param int bd_id: BD to teach
:param dict hosts: dict of hosts per interface
"""
self.vapi.bridge_flags(bd_id=bd_id, is_set=1, flags=1)
swif = pg_if.sw_if_index
packets = [Ether(dst="ff:ff:ff:ff:ff:ff", src=host.mac)
for host in hosts[swif]]
pg_if.add_stream(packets)
self.logger.info("Sending broadcast eth frames for MAC learning")
self.pg_start()
def test_l2bd_learnlimit01(self):
""" L2BD test without learn Limit
"""
hosts = self.create_hosts(self.pg_interfaces[0], 20, 1)
self.learn_hosts(self.pg_interfaces[0], 1, hosts)
lfs = self.vapi.l2_fib_table_dump(1)
# check that 20 macs are learned.
self.assertEqual(len(lfs), 20)
def test_l2bd_learnlimit02(self):
""" L2BD test with learn Limit
"""
self.vapi.want_l2_macs_events(enable_disable=1, learn_limit=10)
hosts = self.create_hosts(self.pg_interfaces[0], 20, 1)
fhosts = self.create_hosts(self.pg_interfaces[1], 1, 2)
# inject 20 mac addresses on bd1
self.learn_hosts(self.pg_interfaces[0], 1, hosts)
# inject 1 mac address on bd2
self.learn_hosts(self.pg_interfaces[1], 2, fhosts)
lfs1 = self.vapi.l2_fib_table_dump(1)
lfs2 = self.vapi.l2_fib_table_dump(2)
# check that only 10 macs are learned.
self.assertEqual(len(lfs1), 10)
# check that bd2 was not able to learn
self.assertEqual(len(lfs2), 0)
def test_l2bd_learnlimit03(self):
""" L2BD test with bridge domain limit
"""
self.vapi.bridge_domain_set_default_learn_limit(4)
self.vapi.bridge_domain_add_del(bd_id=3)
self.vapi.sw_interface_set_l2_bridge(
self.pg_interfaces[2].sw_if_index, bd_id=3)
self.vapi.bridge_domain_set_learn_limit(2, 5)
hosts = self.create_hosts(self.pg_interfaces[1], 20, 2)
fhosts = self.create_hosts(self.pg_interfaces[2], 20, 3)
# inject 20 mac addresses on bd2
self.learn_hosts(self.pg_interfaces[1], 2, hosts)
# inject 20 macs address on bd3
self.learn_hosts(self.pg_interfaces[2], 3, fhosts)
lfs1 = self.vapi.l2_fib_table_dump(2)
lfs2 = self.vapi.l2_fib_table_dump(3)
# check that only 5 macs are learned.
self.assertEqual(len(lfs1), 5)
# check that only 4 macs are learned.
self.assertEqual(len(lfs2), 4)
self.vapi.sw_interface_set_l2_bridge(
rx_sw_if_index=self.pg_interfaces[2].sw_if_index,
bd_id=3, enable=0)
self.vapi.bridge_domain_add_del(is_add=0, bd_id=3)
def setUp(self):
super(TestL2LearnLimit, self).setUp()
self.vapi.bridge_domain_add_del(bd_id=1)
self.vapi.bridge_domain_add_del(bd_id=2)
self.vapi.sw_interface_set_l2_bridge(
self.pg_interfaces[0].sw_if_index, bd_id=1)
self.vapi.sw_interface_set_l2_bridge(
self.pg_interfaces[1].sw_if_index, bd_id=2)
def tearDown(self):
super(TestL2LearnLimit, self).tearDown()
self.vapi.sw_interface_set_l2_bridge(
rx_sw_if_index=self.pg_interfaces[0].sw_if_index,
bd_id=1, enable=0)
self.vapi.sw_interface_set_l2_bridge(
rx_sw_if_index=self.pg_interfaces[1].sw_if_index,
bd_id=2, enable=0)
self.vapi.bridge_domain_add_del(bd_id=1, is_add=0)
self.vapi.bridge_domain_add_del(bd_id=2, is_add=0)
i = 0
while (len(self.vapi.l2_fib_table_dump(bd_id=0xffffffff)) != 0):
time.sleep(1)
i = i + 1
if i == 30:
self.assertTrue(False)
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)
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