path: root/tests/topotests/ospfv3_basic_functionality/test_ospfv3_routemaps.py

#!/usr/bin/python

#
# Copyright (c) 2021 by VMware, Inc. ("VMware")
# Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
# ("NetDEF") in this file.
#
# Permission to use, copy, modify, and/or distribute this software
# for any purpose with or without fee is hereby granted, provided
# that the above copyright notice and this permission notice appear
# in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
# OF THIS SOFTWARE.
#


"""OSPF Basic Functionality Automation."""
import os
import sys
import time
import pytest
import json
from copy import deepcopy
from ipaddress import IPv4Address
from lib.topotest import frr_unicode

# Save the Current Working Directory to find configuration files.
CWD = os.path.dirname(os.path.realpath(__file__))
sys.path.append(os.path.join(CWD, "../"))
sys.path.append(os.path.join(CWD, "../lib/"))

# pylint: disable=C0413
# Import topogen and topotest helpers
from lib.topogen import Topogen, get_topogen
import ipaddress

# Import topoJson from lib, to create topology and initial configuration
from lib.common_config import (
    start_topology,
    write_test_header,
    write_test_footer,
    reset_config_on_routers,
    create_prefix_lists,
    verify_rib,
    create_static_routes,
    step,
    create_route_maps,
    verify_prefix_lists,
    get_frr_ipv6_linklocal,
    topo_daemons,
)
from lib.topolog import logger
from lib.topojson import build_topo_from_json, build_config_from_json

from lib.ospf import (
    verify_ospf6_neighbor,
    config_ospf_interface,
    clear_ospf,
    verify_ospf6_rib,
    create_router_ospf,
    verify_ospf6_interface,
    verify_ospf6_database,
    config_ospf6_interface,
)

from ipaddress import IPv6Address

pytestmark = [pytest.mark.ospfd, pytest.mark.staticd]


# Global variables
topo = None

# Reading the data from JSON File for topology creation
jsonFile = "{}/ospfv3_routemaps.json".format(CWD)
try:
    with open(jsonFile, "r") as topoJson:
        topo = json.load(topoJson)
except IOError:
    assert False, "Could not read file {}".format(jsonFile)

NETWORK = {
    "ipv4": [
        "11.0.20.1/32",
        "11.0.20.2/32",
        "11.0.20.3/32",
        "11.0.20.4/32",
        "11.0.20.5/32",
    ],
    "ipv6": ["2::1/128", "2::2/128", "2::3/128", "2::4/128", "2::5/128"],
}

routerids = ["100.1.1.0", "100.1.1.1", "100.1.1.2", "100.1.1.3"]

"""
TOPOOLOGY =
      Please view in a fixed-width font such as Courier.
      +---+  A1       +---+
      +R1 +------------+R2 |
      +-+-+-           +--++
        |  --        --  |
        |    -- A0 --    |
      A0|      ----      |
        |      ----      | A2
        |    --    --    |
        |  --        --  |
      +-+-+-            +-+-+
      +R0 +-------------+R3 |
      +---+     A3     +---+

TESTCASES =
2. Verify OSPF route map support functionality when route map is not
    configured at system level but configured in OSPF
4. Verify OSPF route map support functionality
    when route map actions are toggled.
5. Verify OSPF route map support  functionality with multiple sequence
    numbers in a single  route-map for different match/set clauses.
6. Verify OSPF route map support functionality when we add/remove route-maps
    with multiple set clauses and without any match statement.(Set only)
7.  Verify OSPF route map support functionality when we
    add/remove route-maps with multiple match clauses and without
    any set statement.(Match only)
8. Verify OSPF route map applied to ospf redistribution with  ipv6 prefix list
 """


class CreateTopo(Topo):
    """
    Test topology builder.

    * `Topo`: Topology object
    """

    def build(self, *_args, **_opts):
        """Build function."""
        tgen = get_topogen(self)

        # Building topology from json file
        build_topo_from_json(tgen, topo)


def setup_module(mod):
    """
    Sets up the pytest environment

    * `mod`: module name
    """
    global topo
    testsuite_run_time = time.asctime(time.localtime(time.time()))
    logger.info("Testsuite start time: {}".format(testsuite_run_time))
    logger.info("=" * 40)

    logger.info("Running setup_module to create topology")

    # This function initiates the topology build with Topogen...
    tgen = Topogen(CreateTopo, mod.__name__)
    # ... and here it calls Mininet initialization functions.

    # get list of daemons needs to be started for this suite.
    daemons = topo_daemons(tgen, topo)

    # Starting topology, create tmp files which are loaded to routers
    #  to start deamons and then start routers
    start_topology(tgen, daemons)

    # Creating configuration from JSON
    build_config_from_json(tgen, topo)

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

    ospf_covergence = verify_ospf6_neighbor(tgen, topo)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    logger.info("Running setup_module() done")


def teardown_module(mod):
    """
    Teardown the pytest environment.

    * `mod`: module name
    """

    logger.info("Running teardown_module to delete topology")

    tgen = get_topogen()

    # Stop toplogy and Remove tmp files
    tgen.stop_topology()

    logger.info(
        "Testsuite end time: {}".format(time.asctime(time.localtime(time.time())))
    )
    logger.info("=" * 40)


# ##################################
# Test cases start here.
# ##################################


def test_ospfv3_routemaps_functionality_tc20_p0(request):
    """
    OSPF route map support functionality.

    Verify OSPF route map support functionality when route map is not
    configured at system level but configured in OSPF

    """
    tc_name = request.node.name
    write_test_header(tc_name)
    tgen = get_topogen()
    global topo
    step("Bring up the base config as per the topology")

    reset_config_on_routers(tgen)

    step("Create static routes(10.0.20.1/32 and 10.0.20.2/32) in R0")
    # Create Static routes
    input_dict = {
        "r0": {
            "static_routes": [
                {
                    "network": NETWORK["ipv6"][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)

    step("Redistribute to ospf using route map ( non existent route map)")
    ospf_red_r1 = {
        "r0": {
            "ospf6": {
                "redistribute": [{"redist_type": "static", "route_map": "rmap_ipv6"}]
            }
        }
    }
    result = create_router_ospf(tgen, topo, ospf_red_r1)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    step(
        "Verify that routes are not allowed in OSPF even tough no "
        "matching routing map is configured."
    )

    dut = "r1"
    protocol = "ospf"
    result = verify_ospf6_rib(tgen, dut, input_dict)
    assert (
        result is not True
    ), "Testcase {} : Failed \n Route found in the RIB, Error: {}".format(
        tc_name, result
    )

    result = verify_rib(tgen, "ipv6", dut, input_dict, protocol=protocol)
    assert (
        result is not True
    ), "Testcase {} : Failed \n Route found in the RIB, Error: {}".format(
        tc_name, result
    )

    step(
        "configure the route map with the same name that is used "
        "in the ospf with deny rule."
    )

    # Create route map
    routemaps = {"r0": {"route_maps": {"rmap_ipv6": [{"action": "deny"}]}}}
    result = create_route_maps(tgen, routemaps)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    step("verify that now route map is activated & routes are denied in OSPF.")
    dut = "r1"
    protocol = "ospf"
    result = verify_ospf6_rib(tgen, dut, input_dict, expected=False)
    assert (
        result is not True
    ), "Testcase {} : Failed \n Route found in the RIB, Error: {}".format(
        tc_name, result
    )

    result = verify_rib(
        tgen, "ipv6", dut, input_dict, protocol=protocol, expected=False
    )
    assert (
        result is not True
    ), "Testcase {} : Failed \n Route found in the RIB, Error: {}".format(
        tc_name, result
    )

    # Create route map
    routemaps = {"r0": {"route_maps": {"rmap_ipv6": [{"action": "deny"}]}}}
    result = create_route_maps(tgen, routemaps)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    step("verify that now route map is activated & routes are denied in OSPF.")
    dut = "r1"
    protocol = "ospf"
    result = verify_ospf6_rib(tgen, dut, input_dict, expected=False)
    assert (
        result is not True
    ), "Testcase {} : Failed \n Route found in the RIB, Error: {}".format(
        tc_name, result
    )

    result = verify_rib(
        tgen, "ipv6", dut, input_dict, protocol=protocol, expected=False
    )
    assert (
        result is not True
    ), "Testcase {} : Failed \n Route found in the RIB, Error: {}".format(
        tc_name, result
    )

    step("Delete the route map.")
    # Create route map
    routemaps = {
        "r0": {"route_maps": {"rmap_ipv6": [{"action": "deny", "delete": True}]}}
    }
    result = create_route_maps(tgen, routemaps)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    step(
        "Verify that routes are allowed in OSPF even tough "
        "no matching routing map is configured."
    )
    dut = "r1"
    protocol = "ospf"
    result = verify_ospf6_rib(tgen, dut, input_dict, expected=False)
    assert (
        result is not True
    ), "Testcase {} : Failed \n Route found in the RIB, Error: {}".format(
        tc_name, result
    )

    result = verify_rib(
        tgen, "ipv6", dut, input_dict, protocol=protocol, expected=False
    )
    assert (
        result is not True
    ), "Testcase {} : Failed \n Route found in the RIB, Error: {}".format(
        tc_name, result
    )

    write_test_footer(tc_name)


def test_ospfv3_routemaps_functionality_tc25_p0(request):
    """
    OSPF route map support functionality.

    Verify OSPF route map support functionality
    when route map actions are toggled.

    """
    tc_name = request.node.name
    write_test_header(tc_name)
    tgen = get_topogen()
    global topo
    step("Bring up the base config as per the topology")

    reset_config_on_routers(tgen)

    step(
        "Create static routes(10.0.20.1/32) in R1 and redistribute "
        "to OSPF using route map."
    )

    # Create Static routes
    input_dict = {
        "r0": {
            "static_routes": [
                {
                    "network": NETWORK["ipv6"][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)

    ospf_red_r0 = {
        "r0": {
            "ospf6": {
                "redistribute": [{"redist_type": "static", "route_map": "rmap_ipv6"}]
            }
        }
    }
    result = create_router_ospf(tgen, topo, ospf_red_r0)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)
    step("Configure route map with permit rule")
    # Create route map
    routemaps = {"r0": {"route_maps": {"rmap_ipv6": [{"action": "permit"}]}}}
    result = create_route_maps(tgen, routemaps)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    step("Verify that route is advertised to R1.")
    dut = "r1"
    protocol = "ospf"
    result = verify_ospf6_rib(tgen, dut, input_dict)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    result = verify_rib(tgen, "ipv6", dut, input_dict, protocol=protocol)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)
    step("Configure route map with deny rule")
    # Create route map
    routemaps = {
        "r0": {"route_maps": {"rmap_ipv6": [{"seq_id": 10, "action": "deny"}]}}
    }
    result = create_route_maps(tgen, routemaps)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    # Api call verify whether OSPF is converged
    ospf_covergence = verify_ospf6_neighbor(tgen, topo)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    step("Verify that route is not advertised to R1.")
    dut = "r1"
    protocol = "ospf"
    result = verify_ospf6_rib(tgen, dut, input_dict, expected=False)
    assert (
        result is not True
    ), "Testcase {} : Failed \n Route found in the RIB, Error: {}".format(
        tc_name, result
    )

    result = verify_rib(
        tgen, "ipv6", dut, input_dict, protocol=protocol, expected=False
    )
    assert (
        result is not True
    ), "Testcase {} : Failed \n Route found in the RIB, Error: {}".format(
        tc_name, result
    )

    write_test_footer(tc_name)


def test_ospfv3_routemaps_functionality_tc22_p0(request):
    """
    OSPF Route map - Multiple sequence numbers.

    Verify OSPF route map support  functionality with multiple sequence
    numbers in a single  route-map for different match/set clauses.

    """
    tc_name = request.node.name
    write_test_header(tc_name)
    tgen = get_topogen()
    global topo
    step("Bring up the base config as per the topology")

    reset_config_on_routers(tgen)

    step(
        "Configure route map with seq number 10 to with ip prefix"
        " permitting route 10.0.20.1/32 in R1"
    )
    step(
        "Configure route map with seq number 20 to with  ip prefix"
        "  permitting route 10.0.20.2/32 in R1"
    )

    # Create route map
    input_dict_3 = {
        "r0": {
            "route_maps": {
                "rmap_ipv6": [
                    {
                        "action": "permit",
                        "seq_id": "10",
                        "match": {"ipv6": {"prefix_lists": "pf_list_1_ipv6"}},
                    },
                    {
                        "action": "permit",
                        "seq_id": "20",
                        "match": {"ipv6": {"prefix_lists": "pf_list_2_ipv4"}},
                    },
                ]
            }
        }
    }
    result = create_route_maps(tgen, input_dict_3)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    # Create ip prefix list
    input_dict_2 = {
        "r0": {
            "prefix_lists": {
                "ipv4": {
                    "pf_list_1_ipv6": [
                        {"seqid": 10, "network": NETWORK["ipv6"][0], "action": "permit"}
                    ]
                }
            }
        }
    }
    result = create_prefix_lists(tgen, input_dict_2)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    # Create ip prefix list
    input_dict_2 = {
        "r0": {
            "prefix_lists": {
                "ipv4": {
                    "pf_list_2_ipv4": [
                        {"seqid": 10, "network": NETWORK["ipv6"][1], "action": "permit"}
                    ]
                }
            }
        }
    }
    result = create_prefix_lists(tgen, input_dict_2)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    step("Configure static routes 10.0.20.1/32 and 10.0.20.2 in R1")
    # Create Static routes
    input_dict = {
        "r0": {
            "static_routes": [
                {
                    "network": NETWORK["ipv6"][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)

    step("Configure redistribute static route with route map.")
    ospf_red_r0 = {
        "r0": {
            "ospf6": {
                "redistribute": [{"redist_type": "static", "route_map": "rmap_ipv6"}]
            }
        }
    }
    result = create_router_ospf(tgen, topo, ospf_red_r0)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    input_dict = {
        "r0": {
            "static_routes": [
                {
                    "network": NETWORK["ipv6"][0],
                    "no_of_ip": 2,
                    "next_hop": "Null0",
                }
            ]
        }
    }
    result = create_static_routes(tgen, input_dict)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    step("Verify that both routes are learned in R1 and R2")
    dut = "r1"
    protocol = "ospf"
    result = verify_ospf6_rib(tgen, dut, input_dict)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    result = verify_rib(tgen, "ipv6", dut, input_dict, protocol=protocol)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    dut = "r2"
    protocol = "ospf"
    result = verify_ospf6_rib(tgen, dut, input_dict)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    result = verify_rib(tgen, "ipv6", dut, input_dict, protocol=protocol)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    step("Change route map with seq number 20 to deny.")
    # Create route map
    input_dict_3 = {
        "r0": {
            "route_maps": {
                "rmap_ipv6": [
                    {
                        "action": "deny",
                        "seq_id": "20",
                        "match": {"ipv6": {"prefix_lists": "pf_list_2_ipv4"}},
                    }
                ]
            }
        }
    }
    result = create_route_maps(tgen, input_dict_3)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    step(
        "Verify the route 10.0.20.2/32 is withdrawn and not present "
        "in the routing table of R0 and R1."
    )

    input_dict = {
        "r0": {"static_routes": [{"network": NETWORK["ipv6"][1], "next_hop": "Null0"}]}
    }

    dut = "r1"
    protocol = "ospf"
    result = verify_ospf6_rib(tgen, dut, input_dict, expected=False)
    assert (
        result is not True
    ), "Testcase {} : Failed \n Route found in the RIB, Error: {}".format(
        tc_name, result
    )

    result = verify_rib(
        tgen, "ipv6", dut, input_dict, protocol=protocol, expected=False
    )
    assert (
        result is not True
    ), "Testcase {} : Failed \n Route found in the RIB, Error: {}".format(
        tc_name, result
    )

    dut = "r2"
    protocol = "ospf"
    result = verify_ospf6_rib(tgen, dut, input_dict, expected=False)
    assert (
        result is not True
    ), "Testcase {} : Failed \n Route found in the RIB, Error: {}".format(
        tc_name, result
    )

    result = verify_rib(
        tgen, "ipv6", dut, input_dict, protocol=protocol, expected=False
    )
    assert (
        result is not True
    ), "Testcase {} : Failed \n Route found in the RIB, Error: {}".format(
        tc_name, result
    )

    write_test_footer(tc_name)


def test_ospfv3_routemaps_functionality_tc24_p0(request):
    """
    OSPF Route map - Multiple set clauses.

    Verify OSPF route map support functionality when we
    add/remove route-maps with multiple match clauses and without
    any set statement.(Match only)

    """
    tc_name = request.node.name
    write_test_header(tc_name)
    tgen = get_topogen()
    global topo
    step("Bring up the base config as per the topology")

    reset_config_on_routers(tgen)

    step(
        "Create static routes(10.0.20.1/32) in R1 and redistribute to "
        "OSPF using route map."
    )
    # Create Static routes
    input_dict = {
        "r0": {
            "static_routes": [
                {
                    "network": NETWORK["ipv6"][0],
                    "no_of_ip": 1,
                    "next_hop": "Null0",
                }
            ]
        }
    }
    result = create_static_routes(tgen, input_dict)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    ospf_red_r0 = {
        "r0": {
            "ospf6": {
                "redistribute": [{"redist_type": "static", "route_map": "rmap_ipv6"}]
            }
        }
    }
    result = create_router_ospf(tgen, topo, ospf_red_r0)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    # Create ip prefix list
    pfx_list = {
        "r0": {
            "prefix_lists": {
                "ipv6": {
                    "pf_list_1_ipv6": [
                        {"seqid": 10, "network": "any", "action": "permit"}
                    ]
                }
            }
        }
    }
    result = create_prefix_lists(tgen, pfx_list)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    step("verify that prefix-list is created in R0.")
    result = verify_prefix_lists(tgen, pfx_list)
    assert (
        result is not True
    ), "Testcase {} : Failed \n Prefix list not " "present. Error: {}".format(
        tc_name, result
    )

    # Create route map
    routemaps = {
        "r0": {
            "route_maps": {
                "rmap_ipv6": [
                    {
                        "action": "permit",
                        "match": {"ipv6": {"prefix_lists": "pf_list_1_ipv6"}},
                    }
                ]
            }
        }
    }
    result = create_route_maps(tgen, routemaps)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    step("Verify that metric falls back to original metric for ospf routes.")
    dut = "r1"
    protocol = "ospf"

    result = verify_ospf6_rib(tgen, dut, input_dict)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    result = verify_rib(tgen, "ipv6", dut, input_dict, protocol=protocol)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    step(
        "Create static routes(10.0.20.1/32) in R1 and redistribute to "
        "OSPF using route map."
    )
    # Create Static routes
    input_dict = {
        "r0": {
            "static_routes": [
                {
                    "network": NETWORK["ipv6"][1],
                    "no_of_ip": 1,
                    "next_hop": "Null0",
                    "tag": 1000,
                }
            ]
        }
    }
    result = create_static_routes(tgen, input_dict)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    # Create ip prefix list
    pfx_list = {
        "r0": {
            "prefix_lists": {
                "ipv6": {
                    "pf_list_1_ipv6": [
                        {"seqid": 10, "network": "any", "action": "permit"}
                    ]
                }
            }
        }
    }
    result = create_prefix_lists(tgen, pfx_list)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    step("verify that prefix-list is created in R0.")
    result = verify_prefix_lists(tgen, pfx_list)
    assert (
        result is not True
    ), "Testcase {} : Failed \n Prefix list not " "present. Error: {}".format(
        tc_name, result
    )

    # Create route map
    routemaps = {
        "r0": {
            "route_maps": {
                "rmap_ipv6": [{"action": "permit", "match": {"ipv6": {"tag": "1000"}}}]
            }
        }
    }
    result = create_route_maps(tgen, routemaps)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    step("Verify that metric falls back to original metric for ospf routes.")
    dut = "r1"
    protocol = "ospf"

    result = verify_ospf6_rib(tgen, dut, input_dict)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    result = verify_rib(tgen, "ipv6", dut, input_dict, protocol=protocol)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    step("Delete the match clause with tag in route map")
    # Create route map
    routemaps = {
        "r0": {
            "route_maps": {
                "rmap_ipv6": [
                    {
                        "action": "permit",
                        "match": {"ipv6": {"tag": "1000", "delete": True}},
                    }
                ]
            }
        }
    }
    result = create_route_maps(tgen, routemaps)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    step("Verify that metric falls back to original metric for ospf routes.")
    dut = "r1"
    protocol = "ospf"

    result = verify_ospf6_rib(tgen, dut, input_dict)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    result = verify_rib(tgen, "ipv6", dut, input_dict, protocol=protocol)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    step("Delete the match clause with metric in route map.")

    # Create route map
    routemaps = {
        "r0": {
            "route_maps": {
                "rmap_ipv6": [
                    {
                        "action": "permit",
                        "match": {"ipv6": {"prefix_lists": "pf_list_1_ipv6"}},
                    }
                ]
            }
        }
    }
    result = create_route_maps(tgen, routemaps)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    result = verify_ospf6_rib(tgen, dut, input_dict)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    result = verify_rib(tgen, "ipv6", dut, input_dict, protocol=protocol)
    assert result is True, "Testcase {} : Failed \n Error: {}".format(tc_name, result)

    write_test_footer(tc_name)


if __name__ == "__main__":
    args = ["-s"] + sys.argv[1:]
    sys.exit(pytest.main(args))