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#!/usr/bin/env python
# SPDX-License-Identifier: ISC
#
# test_ospf_suppres_fa.py
# Carles Kishimoto
#
"""
test_ospf_suppres_fa.py: Test OSPF suppress-fa feature
- Topology: r1 --- R2 (ABR) --- R3 (redistribute static)
test_ospf_set_suppress_fa()
1) R1: Get a dict[LSA_ID] = fwd_addr for all type 5 LSA
2) R2: Configure: area 1 nssa suppress-fa
3) R1: Get a dict[LSA_ID] and compare fwd_address with 0.0.0.0
test_ospf_unset_suppress_fa()
4) R2: Configure: no area 1 nssa suppress-fa
5) R1: Get a dict[LSA_ID] = fwd_addr and compare it with the dict obtained in 1)
"""
import os
import sys
import re
import pytest
# Save the Current Working Directory to find configuration files.
CWD = os.path.dirname(os.path.realpath(__file__))
sys.path.append(os.path.join(CWD, "../"))
# pylint: disable=C0413
# Import topogen and topotest helpers
from lib import topotest
from lib.topogen import Topogen, TopoRouter, get_topogen
# Required to instantiate the topology builder class.
pytestmark = [pytest.mark.ospfd]
def build_topo(tgen):
"Build function"
# Create routers
for router in range(1, 4):
tgen.add_router("r{}".format(router))
# R1-R2 backbone area
switch = tgen.add_switch("s1")
switch.add_link(tgen.gears["r1"])
switch.add_link(tgen.gears["r2"])
# R2-R3 NSSA area
switch = tgen.add_switch("s2")
switch.add_link(tgen.gears["r2"])
switch.add_link(tgen.gears["r3"])
def setup_module(mod):
"Sets up the pytest environment"
tgen = Topogen(build_topo, mod.__name__)
tgen.start_topology()
# This is a sample of configuration loading.
router_list = tgen.routers()
# For all registered routers, load the zebra and ospf configuration file
for rname, router in router_list.items():
router.load_config(
TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname))
)
router.load_config(
TopoRouter.RD_OSPF, os.path.join(CWD, "{}/ospfd.conf".format(rname))
)
tgen.start_router()
def teardown_module(_mod):
"Teardown the pytest environment"
tgen = get_topogen()
tgen.stop_topology()
def test_converge_protocols():
"Wait for protocol convergence"
tgen = get_topogen()
# Don't run this test if we have any failure.
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
topotest.sleep(10, "Waiting for OSPF convergence")
def ospf_configure_suppress_fa(router_name, area):
"Configure OSPF suppress-fa in router_name"
tgen = get_topogen()
router = tgen.gears[router_name]
router.vtysh_cmd(
"conf t\nrouter ospf\narea {} nssa suppress-fa\nexit\n".format(area)
)
def ospf_unconfigure_suppress_fa(router_name, area):
"Remove OSPF suppress-fa in router_name"
tgen = get_topogen()
router = tgen.gears[router_name]
router.vtysh_cmd("conf t\nrouter ospf\narea {} nssa\nexit\n".format(area))
def ospf_get_lsa_type5(router_name):
"Return a dict with link state id as key and forwarding addresses as value"
result = dict()
tgen = get_topogen()
router = tgen.gears[router_name]
cmd = "show ip ospf database external\n"
output = topotest.normalize_text(router.vtysh_cmd(cmd))
for line in output.splitlines():
re0 = re.match(r"\s+Link State ID: (\S+) \(External Network Number\)", line)
if re0:
lsa = re0.group(1)
re1 = re.match(r"\s+Forward Address: (\S+)", line)
if re1:
result[lsa] = re1.group(1)
return result
@pytest.fixture(scope="module", name="original")
def test_ospf_set_suppress_fa():
"Test OSPF area [x] nssa suppress-fa"
# Get current forwarding address for each LSA type-5 in r1
initial = ospf_get_lsa_type5("r1")
# Configure suppres-fa in r2 area 1
ospf_configure_suppress_fa("r2", "1")
topotest.sleep(10, "Waiting for OSPF convergence")
# Check forwarding address on r1 for all statics is 0.0.0.0
assertmsg = "Forwarding address is not 0.0.0.0 after enabling OSPF suppress-fa"
suppress = ospf_get_lsa_type5("r1")
for prefix in suppress:
assert suppress[prefix] == "0.0.0.0", assertmsg
# Return the original forwarding addresses so we can compare them
# in the test_ospf_unset_supress_fa
return initial
def test_ospf_unset_supress_fa(original):
"Test OSPF no area [x] nssa suppress-fa"
# Remove suppress-fa in r2 area 1
ospf_unconfigure_suppress_fa("r2", "1")
topotest.sleep(10, "Waiting for OSPF convergence")
# Check forwarding address is the original value on r1 for all statics
assertmsg = "Forwarding address is not correct after removing OSPF suppress-fa"
restore = ospf_get_lsa_type5("r1")
for prefix in restore:
assert restore[prefix] == original[prefix], assertmsg
if __name__ == "__main__":
args = ["-s"] + sys.argv[1:]
sys.exit(pytest.main(args))
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