tests: extend topotest to test NSSA ranges

Test NSSA address ranges, including the "cost" and "not-advertise"
options.

Signed-off-by: Renato Westphal <renato@opensourcerouting.org>

tests/topotests/ospf6_topo2/test_ospf6_topo2.py

@@ -131,6 +131,8 @@ def build_topo(tgen):
     switch.add_link(tgen.gears["r2"])
     switch.add_link(tgen.gears["r4"])
 
+    switch = tgen.add_switch("s4")
+    switch.add_link(tgen.gears["r4"], nodeif="r4-stubnet")
 
 def setup_module(mod):
     "Sets up the pytest environment"
@@ -484,7 +486,7 @@ def test_area_filters():
         pytest.skip(tgen.errors)
 
     #
-    # Configure import/export filters on r2 (ABR for area 1).
+    # Configure import/export filters on r2 (ABR for area 2).
     #
     config = """
     configure terminal
@@ -544,6 +546,102 @@ def test_area_filters():
     expect_ospfv3_routes("r1", routes, wait=30, type="inter-area")
 
 
+def test_nssa_range():
+    """
+    Test NSSA ABR ranges.
+    """
+    tgen = get_topogen()
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    # Configure new addresses on r4 and enable redistribution of connected
+    # routes.
+    config = """
+    configure terminal
+    interface r4-stubnet
+    ipv6 address 2001:db8:1000::1/128
+    ipv6 address 2001:db8:1000::2/128
+    router ospf6
+    redistribute connected
+    """
+    tgen.gears["r4"].vtysh_cmd(config)
+    logger.info("Expecting NSSA-translated external routes to be added on r3")
+    routes = {"2001:db8:1000::1/128": {}, "2001:db8:1000::2/128": {}}
+    expect_ospfv3_routes("r3", routes, wait=30, type="external-2")
+
+    # Configure an NSSA range on r2 (ABR for area 2).
+    config = """
+    configure terminal
+    router ospf6
+    area 2 nssa range 2001:db8:1000::/64
+    """
+    tgen.gears["r2"].vtysh_cmd(config)
+    logger.info("Expecting summarized routes to be removed from r3")
+    for route in ["2001:db8:1000::1/128", "2001:db8:1000::2/128"]:
+        test_func = partial(dont_expect_route, "r3", route, type="external-2")
+        _, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
+        assertmsg = "{}'s {} summarized route still exists".format("r3", route)
+        assert result is None, assertmsg
+    logger.info("Expecting NSSA range to be added on r3")
+    routes = {
+        "2001:db8:1000::/64": {
+            "metricType":2,
+            "metricCost":20,
+            "metricCostE2":10,
+        }}
+    expect_ospfv3_routes("r3", routes, wait=30, type="external-2", detail=True)
+
+    # Change the NSSA range cost.
+    config = """
+    configure terminal
+    router ospf6
+    area 2 nssa range 2001:db8:1000::/64 cost 1000
+    """
+    tgen.gears["r2"].vtysh_cmd(config)
+    logger.info("Expecting NSSA range to be updated with new cost")
+    routes = {
+        "2001:db8:1000::/64": {
+            "metricType":2,
+            "metricCost":20,
+            "metricCostE2":1000,
+        }}
+    expect_ospfv3_routes("r3", routes, wait=30, type="external-2", detail=True)
+
+    # Configure the NSSA range to not be advertised.
+    config = """
+    configure terminal
+    router ospf6
+    area 2 nssa range 2001:db8:1000::/64 not-advertise
+    """
+    tgen.gears["r2"].vtysh_cmd(config)
+    logger.info("Expecting NSSA summary route to be removed")
+    route = "2001:db8:1000::/64"
+    test_func = partial(dont_expect_route, "r3", route, type="external-2")
+    _, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
+    assertmsg = "{}'s {} NSSA summary route still exists".format("r3", route)
+    assert result is None, assertmsg
+
+    # Remove the NSSA range.
+    config = """
+    configure terminal
+    router ospf6
+    no area 2 nssa range 2001:db8:1000::/64
+    """
+    tgen.gears["r2"].vtysh_cmd(config)
+    logger.info("Expecting previously summarized routes to be re-added")
+    routes = {
+        "2001:db8:1000::1/128": {
+            "metricType":2,
+            "metricCost":20,
+        },
+        "2001:db8:1000::2/128": {
+            "metricType":2,
+            "metricCost":20,
+        },
+    }
+    expect_ospfv3_routes("r3", routes, wait=30, type="external-2", detail=True)
+
+
 def teardown_module(_mod):
     "Teardown the pytest environment"
     tgen = get_topogen()