コード例 #1
0
def test_ospf_cost_tc52_p0(request):
    """OSPF Cost - verifying ospf interface cost functionality"""
    tc_name = request.node.name
    write_test_header(tc_name)
    tgen = get_topogen()
    global topo
    step("Bring up the base config.")
    reset_config_on_routers(tgen)

    step("Configure ospf cost as 20 on interface between R0 and R1. "
         "Configure ospf cost as 30 between interface between R0 and R2.")

    r0_ospf_cost = {
        "r0": {
            "links": {
                "r1": {
                    "ospf": {
                        "cost": 20
                    }
                },
                "r2": {
                    "ospf": {
                        "cost": 30
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r0_ospf_cost)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    step("Verify that cost is updated in the ospf interface between"
         " r0 and r1 as 30 and r0 and r2 as 20")
    dut = "r0"
    result = verify_ospf_interface(tgen,
                                   topo,
                                   dut=dut,
                                   input_dict=r0_ospf_cost)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(
        tc_name, result)

    step("Swap the costs between interfaces on r0, between r0 and r1 to 30"
         ", r0 and r2 to 20")

    r0_ospf_cost = {
        "r0": {
            "links": {
                "r1": {
                    "ospf": {
                        "cost": 30
                    }
                },
                "r2": {
                    "ospf": {
                        "cost": 20
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r0_ospf_cost)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    step("Verify that cost is updated in the ospf interface between r0 "
         "and r1 as 30 and r0 and r2 as 20.")
    result = verify_ospf_interface(tgen,
                                   topo,
                                   dut=dut,
                                   input_dict=r0_ospf_cost)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(
        tc_name, result)

    step(" Un configure cost from the interface r0 - r1.")

    r0_ospf_cost = {
        "r0": {
            "links": {
                "r1": {
                    "ospf": {
                        "cost": 30,
                        "del_action": True
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r0_ospf_cost)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    input_dict = {
        "r0": {
            "links": {
                "r1": {
                    "ospf": {
                        "cost": 10
                    }
                },
                "r2": {
                    "ospf": {
                        "cost": 20
                    }
                }
            }
        }
    }
    step("Verify that cost is updated in the ospf interface between r0"
         " and r1 as 10 and r0 and r2 as 20.")

    result = verify_ospf_interface(tgen, topo, dut=dut, input_dict=input_dict)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(
        tc_name, result)

    step(" Un configure cost from the interface r0 - r2.")

    r0_ospf_cost = {
        "r0": {
            "links": {
                "r2": {
                    "ospf": {
                        "cost": 20,
                        "del_action": True
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r0_ospf_cost)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    step("Verify that cost is updated in the ospf interface between r0"
         "and r1 as 10 and r0 and r2 as 10")

    input_dict = {
        "r0": {
            "links": {
                "r1": {
                    "ospf": {
                        "cost": 10
                    }
                },
                "r2": {
                    "ospf": {
                        "cost": 10
                    }
                }
            }
        }
    }
    result = verify_ospf_interface(tgen, topo, dut=dut, input_dict=input_dict)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(
        tc_name, result)

    write_test_footer(tc_name)
コード例 #2
0
ファイル: test_ospf_ecmp.py プロジェクト: zpericic/frr
def test_ospf_ecmp_tc17_p0(request):
    """
    Verify OSPF ECMP.

    Verify OSPF ECMP with max path configured as 2 (Edge having 2 uplink ports)
    """
    tc_name = request.node.name
    write_test_header(tc_name)
    tgen = get_topogen()

    # Don't run this test if we have any failure.
    if tgen.routers_have_failure():
        pytest.skip(tgen.errors)

    global topo
    step("Bring up the base config as per the topology")
    step("Configure 2 interfaces between R1 and R2 & enable ospf in area 0.")
    reset_config_on_routers(tgen)
    step("Verify that OSPF is up with 2 neighborship sessions.")
    dut = "r1"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence)

    step("Configure a static route in R0 and redistribute in OSPF.")

    input_dict = {
        "r0": {
            "static_routes": [{
                "network": NETWORK["ipv4"][0],
                "no_of_ip": 5,
                "next_hop": "Null0",
            }]
        }
    }
    result = create_static_routes(tgen, input_dict)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(
        tc_name, result)

    dut = "r0"
    red_static(dut)

    step("Verify that route in R2 in stalled with 2 next hops.")

    nh1 = topo["routers"]["r0"]["links"]["r1-link1"]["ipv4"].split("/")[0]
    nh2 = topo["routers"]["r0"]["links"]["r1"]["ipv4"].split("/")[0]
    nh = [nh1, nh2]

    dut = "r1"
    result = verify_ospf_rib(tgen, dut, input_dict, next_hop=nh)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(
        tc_name, result)

    protocol = "ospf"
    result = verify_rib(tgen,
                        "ipv4",
                        dut,
                        input_dict,
                        protocol=protocol,
                        next_hop=nh)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(
        tc_name, result)

    step(" Un configure static route on R0")

    dut = "r0"
    red_static(dut, config=False)
    # sleep till the route gets withdrawn
    sleep(10)

    step("Verify that route is withdrawn from R2.")
    dut = "r1"
    result = verify_ospf_rib(tgen,
                             dut,
                             input_dict,
                             next_hop=nh,
                             attempts=5,
                             expected=False)
    assert result is not True, "Testcase {} : Failed \n Error: {}".format(
        tc_name, result)

    protocol = "ospf"
    result = verify_rib(
        tgen,
        "ipv4",
        dut,
        input_dict,
        protocol=protocol,
        next_hop=nh,
        attempts=5,
        expected=False,
    )
    assert result is not True, "Testcase {} : Failed \n Error: {}".format(
        tc_name, result)

    step("Reconfigure the static route in R0.Change ECMP value to 2.")
    dut = "r0"
    red_static(dut)

    step("Configure cost on R0 as 100")
    r0_ospf_cost = {"r0": {"links": {"r1": {"ospf": {"cost": 100}}}}}
    result = config_ospf_interface(tgen, topo, r0_ospf_cost)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    dut = "r1"
    result = verify_ospf_rib(tgen, dut, input_dict, next_hop=nh)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(
        tc_name, result)

    protocol = "ospf"
    result = verify_rib(tgen,
                        "ipv4",
                        dut,
                        input_dict,
                        protocol=protocol,
                        next_hop=nh)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(
        tc_name, result)

    write_test_footer(tc_name)
コード例 #3
0
def test_ospf_authentication_different_auths_tc30_p1(request):
    """
    OSPF Authentication - Verify ospf authentication with different
    authentication methods.

    """
    tc_name = request.node.name
    write_test_header(tc_name)
    tgen = get_topogen()
    global topo
    step("Bring up the base config.")
    reset_config_on_routers(tgen)
    step("Configure ospf with on R1 and R2, enable ospf on R1 interface "
         "connected to R2 with message-digest authentication using  ip "
         "ospf authentication  message-digest cmd.")

    r1_ospf_auth = {
        "r1": {
            "links": {
                "r2": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "ospf",
                        "message-digest-key": "10",
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r1_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    # wait for dead timer expiry
    sleep(6)
    step("Verify that the neighbour is not FULL between R1 and R2.")
    dut = "r1"
    ospf_covergence = verify_ospf_neighbor(tgen,
                                           topo,
                                           dut=dut,
                                           expected=False,
                                           attempts=5)
    assert ospf_covergence is not True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence)

    step("On R2 enable ospf on interface with message-digest authentication"
         "  using  ip ospf authentication  message-digest password cmd.")

    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "ospf",
                        "message-digest-key": "10",
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    step("Verify that the neighbour is FULL between R1 and R2  "
         "using show ip ospf neighbor cmd.")

    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence)

    step(" Delete the configured password on both the routers.")

    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "ospf",
                        "message-digest-key": "10",
                        "del_action": True,
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    r1_ospf_auth = {
        "r1": {
            "links": {
                "r2": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "ospf",
                        "message-digest-key": "10",
                        "del_action": True,
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r1_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    step("Verify that the deletion is successful and  neighbour is FULL"
         " between R1 and R2 using show ip ospf neighbor cmd.")

    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence)

    step("Change the authentication type to simple password.")
    r1_ospf_auth = {
        "r1": {
            "links": {
                "r2": {
                    "ospf": {
                        "authentication": True,
                        "authentication-key": "ospf"
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r1_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {
                    "ospf": {
                        "authentication": True,
                        "authentication-key": "ospf"
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    step("Verify that the deletion is successful and  neighbour is"
         " FULL between R1 and R2 using show ip ")

    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence)

    step("Change the password in simple password.")

    r1_ospf_auth = {
        "r1": {
            "links": {
                "r2": {
                    "ospf": {
                        "authentication": True,
                        "authentication-key": "OSPFv4"
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r1_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {
                    "ospf": {
                        "authentication": True,
                        "authentication-key": "OSPFv4"
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    step("Verify that the deletion is successful and  neighbour is"
         " FULL between R1 and R2 using show ip ")

    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence)

    step("Delete the password authentication on the interface ")

    r1_ospf_auth = {
        "r1": {
            "links": {
                "r2": {
                    "ospf": {
                        "authentication": True,
                        "authentication-key": "OSPFv4",
                        "del_action": True,
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r1_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {
                    "ospf": {
                        "authentication": True,
                        "authentication-key": "OSPFv4",
                        "del_action": True,
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    step("Verify that the deletion is successful and  neighbour is"
         " FULL between R1 and R2 using show ip ")

    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence)

    step("Enable Md5 authentication on the interface")

    r1_ospf_auth = {
        "r1": {
            "links": {
                "r2": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "ospf",
                        "message-digest-key": "10",
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r1_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "ospf",
                        "message-digest-key": "10",
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    step("Verify that the neighbour is FULL between R1 and R2 using"
         " show ip ospf neighbor cmd.")

    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence)

    step("Change the MD5 authentication password")

    r1_ospf_auth = {
        "r1": {
            "links": {
                "r2": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "OSPFv4",
                        "message-digest-key": "10",
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r1_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "OSPFv4",
                        "message-digest-key": "10",
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    write_test_footer(tc_name)
コード例 #4
0
def test_ospf_tc4_mtu_ignore_p0(request):
    """
    OSPF NFSM - MTU change

    Verify NFSM events when ospf nbr changes with different MTU values
    """
    tc_name = request.node.name
    write_test_header(tc_name)
    tgen = get_topogen()

    # Don't run this test if we have any failure.
    if tgen.routers_have_failure():
        pytest.skip(tgen.errors)

    global topo
    step(" Bring up the base config as per the topology")
    step("Configure OSPF on all the routers of the topology.")
    step("Verify that OSPF neighbors are FULL.")
    reset_config_on_routers(tgen)
    result = verify_ospf_neighbor(tgen, topo)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(
        tc_name, result)

    step("Modify the MTU to non default Value on R0 to R1 interface. "
         "Reset ospf neighbors on R0.")

    rtr0 = tgen.routers()["r0"]
    rtr1 = tgen.routers()["r1"]

    r0_r1_intf = topo["routers"]["r0"]["links"]["r1"]["interface"]
    r1_r0_intf = topo["routers"]["r1"]["links"]["r0"]["interface"]

    rtr0.run("ip link set {} mtu 1200".format(r0_r1_intf))

    clear_ospf(tgen, "r0")

    step("Verify that OSPF neighborship between R0 and R1 is stuck in Exstart"
         " State.")
    result = verify_ospf_neighbor(tgen, topo, expected=False)
    assert result is not True, ("Testcase {} : Failed \n OSPF nbrs are Full "
                                "instead of Exstart. Error: {}".format(
                                    tc_name, result))

    step("Verify that configured MTU value is updated in the show ip "
         "ospf interface.")

    dut = "r0"
    input_dict = {"r0": {"links": {"r1": {"ospf": {"mtuBytes": 1200}}}}}
    result = verify_ospf_interface(tgen, topo, dut=dut, input_dict=input_dict)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(
        tc_name, result)

    step("Modify the MTU to non default Value on R0 to R1 interface. "
         "Reset ospf neighbors on R0.")
    rtr0.run("ip link set {} mtu 1500".format(r0_r1_intf))

    clear_ospf(tgen, "r0")

    step("Verify that OSPF neighborship between R0 and R1 becomes full.")
    result = verify_ospf_neighbor(tgen, topo)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(
        tc_name, result)

    step("Configure mtu ignore and change the value of the mtu to non default"
         " on R0 to R1 interface. Reset ospf neighbors on R0.")
    r0_ospf_mtu = {"r0": {"links": {"r1": {"ospf": {"mtu_ignore": True}}}}}
    result = config_ospf_interface(tgen, topo, r0_ospf_mtu)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    dut = "r0"
    input_dict = {
        "r0": {
            "links": {
                "r1": {
                    "ospf": {
                        "mtuMismatchDetect": True
                    }
                }
            }
        }
    }
    result = verify_ospf_interface(tgen, topo, dut=dut, input_dict=input_dict)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(
        tc_name, result)

    r1_ospf_mtu = {"r1": {"links": {"r0": {"ospf": {"mtu_ignore": True}}}}}
    result = config_ospf_interface(tgen, topo, r1_ospf_mtu)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    rtr0.run("ip link set {} mtu 1200".format(r0_r1_intf))

    clear_ospf(tgen, "r0")

    step("Verify that OSPF neighborship between R0 and R1 becomes full.")
    result = verify_ospf_neighbor(tgen, topo)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(
        tc_name, result)

    step("Unconfigure mtu-ignore command from the interface. "
         "Reset ospf neighbors on R0.")

    r1_ospf_mtu = {
        "r1": {
            "links": {
                "r0": {
                    "ospf": {
                        "mtu_ignore": True,
                        "del_action": True
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r1_ospf_mtu)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    clear_ospf(tgen, "r0")

    step("Verify that OSPF neighborship between R0 and R1 is stuck in Exstart"
         " State.")
    result = verify_ospf_neighbor(tgen, topo, expected=False)
    assert result is not True, ("Testcase {} : Failed \n OSPF nbrs are Full "
                                "instead of Exstart. Error: {}".format(
                                    tc_name, result))

    step("Modify the MTU to again default valaue on R0 to R1 interface.")

    rtr0.run("ip link set {} mtu 1500".format(r0_r1_intf))

    clear_ospf(tgen, "r0")

    step("Verify that OSPF neighborship between R0 and R1 becomes full.")
    result = verify_ospf_neighbor(tgen, topo)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(
        tc_name, result)

    step("Configure ospf interface with jumbo MTU (9216)."
         "Reset ospf neighbors on R0.")

    rtr0.run("ip link set {} mtu 9216".format(r0_r1_intf))
    rtr1.run("ip link set {} mtu 9216".format(r1_r0_intf))

    clear_ospf(tgen, "r0")
    clear_ospf(tgen, "r1")

    step("Verify that OSPF neighborship between R0 and R1 becomes full.")
    result = verify_ospf_neighbor(tgen, topo)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(
        tc_name, result)

    step("Verify that jumbo MTU is updated in the show ip ospf interface.")
    dut = "r0"
    input_dict = {"r0": {"links": {"r1": {"ospf": {"mtuBytes": 9216}}}}}
    result = verify_ospf_interface(tgen, topo, dut=dut, input_dict=input_dict)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(
        tc_name, result)

    write_test_footer(tc_name)
コード例 #5
0
def test_ospf_authentication_md5_tc29_p1(request):
    """
    OSPF Authentication - Verify ospf authentication with MD5 authentication.

    """
    tc_name = request.node.name
    write_test_header(tc_name)
    tgen = get_topogen()
    global topo
    step("Bring up the base config.")
    reset_config_on_routers(tgen)
    step("Configure ospf with on R1 and R2, enable ospf on R1 interface "
         "connected to R2 with message-digest authentication using  ip "
         "ospf authentication  message-digest cmd.")

    r1_ospf_auth = {
        "r1": {
            "links": {
                "r2": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "ospf",
                        "message-digest-key": "10",
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r1_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    step("Verify that the neighbour is not FULL between R1 and R2.")
    # wait for dead time expiry.
    sleep(6)
    dut = "r1"
    ospf_covergence = verify_ospf_neighbor(tgen,
                                           topo,
                                           dut=dut,
                                           expected=False,
                                           attempts=3)
    assert ospf_covergence is not True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence)

    step("On R2 enable ospf on interface with message-digest authentication"
         "  using  ip ospf authentication  message-digest password cmd.")

    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "ospf",
                        "message-digest-key": "10",
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    step("Verify that the neighbour is FULL between R1 and R2  "
         "using show ip ospf neighbor cmd.")

    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence)

    step("Disable message-digest authentication on R2  using no ip ospf "
         "authentication  message-digest password cmd.")

    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "ospf",
                        "message-digest-key": "10",
                        "del_action": True,
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    step("Verify on R1 ,nbr is deleted for R2 after dead interval expiry")
    #  wait till the dead timer expiry
    sleep(6)
    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(tgen,
                                           topo,
                                           dut=dut,
                                           expected=False,
                                           attempts=5)
    assert ospf_covergence is not True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence)

    step("Again On R2 enable ospf on interface with  message-digest auth")
    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "ospf",
                        "message-digest-key": "10",
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    step("Verify that the neighbour is FULL between R1 and R2 using"
         " show ip ospf neighbor cmd.")

    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence)

    step("Shut no shut interface on R1")
    dut = "r1"
    intf = topo["routers"]["r1"]["links"]["r2"]["interface"]
    shutdown_bringup_interface(tgen, dut, intf, False)

    dut = "r2"
    step("Verify that the neighbour is not FULL between R1 and R2 using "
         "show ip ospf neighbor cmd.")
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut, expected=False)
    assert ospf_covergence is not True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence)

    dut = "r1"
    shutdown_bringup_interface(tgen, dut, intf, True)

    step("Verify that the neighbour is FULL between R1 and R2 using "
         "show ip ospf neighbor cmd.")

    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence)

    step("Change Ip address on R1 and R2")

    topo_modify_change_ip = deepcopy(topo)

    intf_ip = topo_modify_change_ip["routers"]["r1"]["links"]["r2"]["ipv4"]

    topo_modify_change_ip["routers"]["r1"]["links"]["r2"]["ipv4"] = str(
        IPv4Address(unicode(intf_ip.split("/")[0])) + 3) + "/{}".format(
            intf_ip.split("/")[1])

    build_config_from_json(tgen, topo_modify_change_ip, save_bkup=False)

    reset_config_on_routers(tgen, routerName="r1")
    dut = "r1"
    intf = topo["routers"]["r1"]["links"]["r2"]["interface"]
    shutdown_bringup_interface(tgen, dut, intf, False)
    shutdown_bringup_interface(tgen, dut, intf, True)
    clear_ospf(tgen, "r1")
    r1_ospf_auth = {
        "r1": {
            "links": {
                "r2": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "ospf",
                        "message-digest-key": "10",
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r1_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(
        tc_name, result)

    step("Verify that the neighbour is FULL between R1 and R2 with new "
         "ip address using show ip ospf ")

    dut = "r1"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence)

    write_test_footer(tc_name)