def test_ospf_link_down():
"Test OSPF convergence after a link goes down"
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip('skipped because of router(s) failure')
# Simulate a network down event on router3 switch3 interface.
router3 = tgen.gears['r3']
topotest.interface_set_status(router3,
'r3-eth0',
ifaceaction=False,
vrf_name='r3-cust1')
# Expect convergence on all routers
for rname, router in tgen.routers().iteritems():
logger.info('Waiting for router "%s" convergence after link failure',
rname)
# Load expected results from the command
reffile = os.path.join(CWD, '{}/ospfroute_down.txt'.format(rname))
expected = open(reffile).read()
# Run test function until we get an result. Wait at most 60 seconds.
test_func = partial(topotest.router_output_cmp, router,
'show ip ospf vrf {0}-cust1 route'.format(rname),
expected)
result, diff = topotest.run_and_expect(test_func,
'',
count=140,
wait=0.5)
assertmsg = 'OSPF did not converge on {}:\n{}'.format(rname, diff)
assert result, assertmsg
def test_ospf_link_down():
"Test OSPF convergence after a link goes down"
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip('skipped because of router(s) failure')
# Simulate a network down event on router3 switch3 interface.
router3 = tgen.gears['r3']
topotest.interface_set_status(router3, 'r3-eth0', ifaceaction=False, vrf_name='r3-cust1')
# Expect convergence on all routers
for rname, router in tgen.routers().iteritems():
logger.info('Waiting for router "%s" convergence after link failure', rname)
# Load expected results from the command
reffile = os.path.join(CWD, '{}/ospfroute_down.txt'.format(rname))
expected = open(reffile).read()
# Run test function until we get an result. Wait at most 60 seconds.
test_func = partial(topotest.router_output_cmp,
router,
'show ip ospf vrf {0}-cust1 route'.format(rname),
expected)
result, diff = topotest.run_and_expect(test_func, '',
count=140, wait=0.5)
assertmsg = 'OSPF did not converge on {}:\n{}'.format(rname, diff)
assert result, assertmsg
def test_bfd_fast_convergence():
"""
Assert that BFD notices the link down after simulating network
failure.
"""
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
# Disable r2-eth0 link
router2 = tgen.gears["r2"]
topotest.interface_set_status(router2,
"r2-eth0",
ifaceaction=False,
vrf_name="r2-bfd-cust1")
# Wait the minimum time we can before checking that BGP/BFD
# converged.
logger.info("waiting for BFD converge")
# Check that BGP converged quickly.
for router in tgen.routers().values():
json_file = "{}/{}/peers.json".format(CWD, router.name)
expected = json.loads(open(json_file).read())
# Load the same file as previous test, but expect R1 to be down.
if router.name == "r1":
for peer in expected:
if peer["peer"] == "192.168.0.2":
peer["status"] = "down"
else:
for peer in expected:
if peer["peer"] == "192.168.0.1":
peer["status"] = "down"
test_func = partial(topotest.router_json_cmp, router,
"show bfd peers json", expected)
_, res = topotest.run_and_expect(test_func, None, count=40, wait=1)
assertmsg = '"{}" JSON output mismatches'.format(router.name)
assert res is None, assertmsg
def test_ospf_link_down():
"Test OSPF convergence after a link goes down"
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip('skipped because of router(s) failure')
# Simulate a network down event on router3 switch3 interface.
router3 = tgen.gears['r3']
topotest.interface_set_status(router3, 'r3-eth0', ifaceaction=False, vrf_name='r3-cust1')
# Expect convergence on all routers
for rnum in range(1, 4):
router = 'r{}'.format(rnum)
logger.info('Waiting for router "%s" convergence after link failure', router)
# Load expected results from the command
reffile = os.path.join(CWD, '{}/ospfroute_down.txt'.format(router))
expected = open(reffile).read()
# Run test function until we get an result. Wait at most 60 seconds.
test_func = partial(compare_show_ip_ospf_vrf, router, expected)
result, diff = topotest.run_and_expect(test_func, '',
count=25, wait=3)
assert result, 'OSPF did not converge on {}:\n{}'.format(router, diff)
def _test_reachability(tgen, testbin):
waitlist = [
"192.168.0.1,192.168.0.2,192.168.0.4",
"192.168.0.2,192.168.0.4",
"192.168.0.1,192.168.0.2,192.168.0.4",
]
r2 = tgen.gears["r2"]
r3 = tgen.gears["r3"]
wait_args = [f"--wait={x}" for x in waitlist]
p = None
try:
step("reachable: check for initial reachability")
p = r3.popen(
["/usr/bin/timeout", "120", testbin, "-v", *wait_args],
encoding=None, # don't buffer
stdin=subprocess.DEVNULL,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
)
_wait_output(p, "SUCCESS: {}".format(waitlist[0]))
step("reachable: check for modified reachability")
interface_set_status(r2, "r2-eth0", False)
_wait_output(p, "SUCCESS: {}".format(waitlist[1]))
step("reachable: check for restored reachability")
interface_set_status(r2, "r2-eth0", True)
_wait_output(p, "SUCCESS: {}".format(waitlist[2]))
except Exception as error:
logging.error("ERROR: %s", error)
raise
finally:
if p:
p.terminate()
p.wait()
def test_bfd_fast_convergence():
"""
Assert that BFD notices the link down after simulating network
failure.
"""
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
# Disable r2-eth0 link
router2 = tgen.gears['r2']
topotest.interface_set_status(router2, 'r2-eth0', ifaceaction=False, vrf_name='r2-cust1')
# Wait the minimum time we can before checking that BGP/BFD
# converged.
logger.info('waiting for BFD converge')
# Check that BGP converged quickly.
for router in tgen.routers().values():
json_file = '{}/{}/peers.json'.format(CWD, router.name)
expected = json.loads(open(json_file).read())
# Load the same file as previous test, but expect R1 to be down.
if router.name == 'r1':
for peer in expected:
if peer['peer'] == '192.168.0.2':
peer['status'] = 'down'
else:
for peer in expected:
if peer['peer'] == '192.168.0.1':
peer['status'] = 'down'
test_func = partial(topotest.router_json_cmp,
router, 'show bfd peers json', expected)
_, res = topotest.run_and_expect(test_func, None, count=20, wait=0.5)
assertmsg = '"{}" JSON output mismatches'.format(router.name)
assert res is None, assertmsg
