tests: Adding bgp path attribute tests

Signed-off-by: Ashish Pant <ashish12pant@gmail.com>

Adding multiple test cases for bgp attributes.
Adding verfication APIs for them.

1 files changed, 1078 insertions, 0 deletions

diff --git a/tests/topotests/bgp-path-attributes-topo1/test_bgp_path_attributes.py b/tests/topotests/bgp-path-attributes-topo1/test_bgp_path_attributes.py
new file mode 100755
index 0000000000..7400d9ee54
--- /dev/null
+++ b/tests/topotests/bgp-path-attributes-topo1/test_bgp_path_attributes.py
@@ -0,0 +1,1078 @@
+#!/usr/bin/env python
+
+#
+# Modified work Copyright (c) 2019 by VMware, Inc. ("VMware")
+# Original work Copyright (c) 2018 by Network Device Education
+# Foundation, Inc. ("NetDEF")
+#
+# 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.
+#
+
+"""
+Following tests are covered to test AS-Path functionality:
+
+Setup module:
+- Create topology (setup module)
+- Bring up topology
+- Verify BGP convergence
+
+Test cases:
+1. Test next_hop attribute and verify best path is installed as per
+   reachable next_hop
+2. Test aspath attribute and verify best path is installed as per
+   shortest AS-Path
+3. Test localpref attribute and verify best path is installed as per
+   shortest local-preference
+4. Test weight attribute and and verify best path is installed as per
+   highest weight
+5. Test origin attribute and verify best path is installed as per
+   IGP>EGP>INCOMPLETE rule
+6. Test med attribute and verify best path is installed as per lowest
+   med value
+7. Test admin distance and verify best path is installed as per lowest
+   admin distance
+
+Teardown module:
+- Bring down the topology
+- stop routers
+
+"""
+
+import os
+import sys
+import pdb
+import json
+import time
+import inspect
+import ipaddress
+from time import sleep
+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 mininet.topo import Topo
+from lib import topotest
+from lib.topogen import Topogen, TopoRouter, get_topogen
+
+# Required to instantiate the topology builder class.
+from lib.common_config import (
+    start_topology, stop_topology, write_test_header,
+    write_test_footer, reset_config_on_routers,
+    verify_rib, create_static_routes,
+    create_prefix_lists, verify_prefix_lists,
+    create_route_maps
+)
+from lib.topolog import logger
+from lib.bgp import (
+    verify_bgp_convergence, create_router_bgp,
+    clear_bgp_and_verify, verify_best_path_as_per_bgp_attribute,
+    verify_best_path_as_per_admin_distance
+)
+from lib.topojson import build_topo_from_json, build_config_from_json
+
+# Reading the data from JSON File for topology creation
+jsonFile = "{}/bgp_path_attributes.json".format(CWD)
+
+try:
+    with open(jsonFile, "r") as topoJson:
+        topo = json.load(topoJson)
+except IOError:
+    assert False, "Could not read file {}".format(jsonFile)
+
+
+####
+class CreateTopo(Topo):
+    """
+    Test CreateTopo - topology 1
+
+    * `Topo`: Topology object
+    """
+
+    def build(self, *_args, **_opts):
+        "Build function"
+        tgen = get_topogen(self)
+
+        # Building topology and configuration from json file
+        build_topo_from_json(tgen, topo)
+
+
+def setup_module(mod):
+    """
+    Sets up the pytest environment
+
+    * `mod`: module name
+    """
+
+    testsuite_run_time = time.asctime(time.localtime(time.time()))
+    logger.info("Testsuite start time: %s", 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.
+
+    # Starting topology, create tmp files which are loaded to routers
+    #  to start deamons and then start routers
+    start_topology(tgen)
+
+    # 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)
+
+    # Checking BGP convergence
+    result = verify_bgp_convergence(tgen, topo)
+    assert result is True, ("setup_module :Failed \n Error:"
+                            " {}".format(result))
+
+    logger.info("Running setup_module() done")
+
+
+def teardown_module():
+    """
+    Teardown the pytest environment
+    """
+
+    logger.info("Running teardown_module to delete topology")
+
+    tgen = get_topogen()
+
+    # Stop toplogy and Remove tmp files
+    stop_topology(tgen)
+
+    logger.info("Testsuite end time: %s",
+                time.asctime(time.localtime(time.time())))
+    logger.info("=" * 40)
+
+
+#####################################################
+##
+##   Testcases
+##
+#####################################################
+def test_next_hop_attribute(request):
+    """
+    Verifying route are not getting installed in, as next_hop is
+    unreachable, Making next hop reachable using next_hop_self
+    command and verifying routes are installed.
+    """
+
+    tgen = get_topogen()
+
+    # Don't run this test if we have any failure.
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    # test case name
+    tc_name = request.node.name
+    write_test_header(tc_name)
+
+    # Creating configuration from JSON
+    reset_config_on_routers(tgen)
+
+    # Api call to advertise networks
+    input_dict = {
+        "r7": {
+            "bgp":{
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "advertise_networks": [
+                                {
+                                    "network": "200.50.2.0/32"
+                                },
+                                {
+                                    "network": "200.60.2.0/32"
+                                }
+                            ]
+                        }
+                    }
+                }
+            }
+        }
+    }
+    result = create_router_bgp(tgen, topo, input_dict)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    # Verifying RIB routes
+    dut = "r1"
+    protocol = "bgp"
+    result = verify_rib(tgen, "ipv4", dut, input_dict, protocol=protocol)
+    try:
+        assert result is True
+    except AssertionError:
+        logger.info("Expected behaviour: %s", result)
+
+    # Configure next-hop-self to bgp neighbor
+    input_dict_1 = {
+        "r2": {
+            "bgp": {
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "neighbor": {
+                                "r1": {
+                                    "dest_link": {
+                                        "r2": {"next_hop_self": True}
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        },
+        "r3": {
+            "bgp": {
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "neighbor": {
+                                "r1": {
+                                    "dest_link": {
+                                        "r3": {"next_hop_self": True}
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+    result = create_router_bgp(tgen, topo, input_dict_1)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    # Verifying RIB routes
+    dut = "r1"
+    protocol = "bgp"
+    result = verify_rib(tgen, "ipv4", dut, input_dict, protocol=protocol)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    write_test_footer(tc_name)
+
+
+def test_aspath_attribute(request):
+    " Verifying AS_PATH attribute functionality"
+
+    tgen = get_topogen()
+
+    # Don't run this test if we have any failure.
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    # test case name
+    tc_name = request.node.name
+    write_test_header(tc_name)
+
+    # Creating configuration from JSON
+    reset_config_on_routers(tgen)
+
+    # Api call to advertise networks
+    input_dict = {
+        "r7": {
+            "bgp": {
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "advertise_networks": [
+                                {
+                                    "network": "200.50.2.0/32"
+                                },
+                                {
+                                    "network": "200.60.2.0/32"
+                                }
+                            ]
+                        }
+                    }
+                }
+            }
+        },
+        "r2": {
+            "bgp": {
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "neighbor": {
+                                "r1": {
+                                    "dest_link": {
+                                        "r2": {"next_hop_self": True}
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        },
+        "r3": {
+            "bgp": {
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "neighbor": {
+                                "r1": {
+                                    "dest_link": {
+                                        "r3": {"next_hop_self": True}
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+    result = create_router_bgp(tgen, topo, input_dict)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    # Verifying best path
+    dut = "r1"
+    attribute = "aspath"
+    result = verify_best_path_as_per_bgp_attribute(tgen, "ipv4", dut,
+                                                   input_dict, attribute)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    write_test_footer(tc_name)
+
+
+def test_localpref_attribute(request):
+    " Verifying LOCAL PREFERENCE attribute functionality"
+
+    tgen = get_topogen()
+
+    # Don't run this test if we have any failure.
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    # test case name
+    tc_name = request.node.name
+    write_test_header(tc_name)
+
+    # Creating configuration from JSON
+    reset_config_on_routers(tgen)
+
+    # Api call to advertise networks
+    input_dict = {
+        "r7": {
+            "bgp": {
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "advertise_networks": [
+                                {
+                                    "network": "200.50.2.0/32"
+                                },
+                                {
+                                    "network": "200.60.2.0/32"
+                                }
+                            ]
+                        }
+                    }
+                }
+            }
+        },
+        "r2": {
+            "bgp": {
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "neighbor": {
+                                "r1": {
+                                    "dest_link": {
+                                        "r2": {"next_hop_self": True}
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        },
+        "r3": {
+            "bgp": {
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "neighbor": {
+                                "r1": {
+                                    "dest_link": {
+                                        "r3": {"next_hop_self": True}
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+    result = create_router_bgp(tgen, topo, input_dict)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    # Create Prefix list
+    input_dict_2 = {
+        "r2": {
+            "prefix_lists": {
+                "ipv4": {
+                    "pf_ls_1": [{
+                        "seqid": 10,
+                        "network": "200.0.0.0/8",
+                        "le": "32",
+                        "action": "permit"
+                    }]
+                }
+            }
+        }
+    }
+    result = create_prefix_lists(tgen, input_dict_2)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    # Create route map
+    input_dict_3 = {
+        "r2": {
+            "route_maps": {
+                "RMAP_LOCAL_PREF": [{
+                    "action": "permit",
+                    "match": {
+                        "ipv4": {
+                            "prefix_lists": "pf_ls_1"
+                        }
+                    },
+                    "set": {
+                        "localpref": 1000
+                    }
+                }]
+            }
+        }
+    }
+    result = create_route_maps(tgen, input_dict_3)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    # Configure neighbor for route map
+    input_dict_4 = {
+        "r2": {
+            "bgp": {
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "neighbor": {
+                                "r1": {
+                                    "dest_link": {
+                                        "r3": {
+                                            "route_maps": [
+                                                {"name": "RMAP_LOCAL_PREF",
+                                                 "direction": "in"}
+                                            ]
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+    result = create_router_bgp(tgen, topo, input_dict_4)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    # Verifying best path
+    dut = "r1"
+    attribute = "localpref"
+    result = verify_best_path_as_per_bgp_attribute(tgen, "ipv4", dut,
+                                                   input_dict, attribute)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    write_test_footer(tc_name)
+
+
+def test_weight_attribute(request):
+    " Verifying WEIGHT attribute functionality"
+
+    tgen = get_topogen()
+
+    # Don't run this test if we have any failure.
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    # test case name
+    tc_name = request.node.name
+    write_test_header(tc_name)
+
+    # Creating configuration from JSON
+    reset_config_on_routers(tgen)
+
+    # Api call to advertise networks
+    input_dict = {
+        "r7": {
+            "bgp": {
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "advertise_networks": [
+                                {
+                                    "network": "200.50.2.0/32"
+                                },
+                                {
+                                    "network": "200.60.2.0/32"
+                                }
+                            ]
+                        }
+                    }
+                }
+            }
+        },
+        "r2": {
+            "bgp": {
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "neighbor": {
+                                "r1": {
+                                    "dest_link": {
+                                        "r2": {"next_hop_self": True}
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        },
+        "r3": {
+            "bgp": {
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "neighbor": {
+                                "r1": {
+                                    "dest_link": {
+                                        "r3": {"next_hop_self": True}
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+    result = create_router_bgp(tgen, topo, input_dict)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    # Create Prefix list
+    input_dict_2 = {
+        "r1": {
+            "prefix_lists": {
+                "ipv4": {
+                    "pf_ls_1": [{
+                        "seqid": 10,
+                        "network": "200.0.0.0/8",
+                        "le": "32",
+                        "action": "permit"
+                    }]
+                }
+            }
+        }
+    }
+    result = create_prefix_lists(tgen, input_dict_2)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    # Create route map
+    input_dict_3 = {
+        "r1": {
+            "route_maps": {
+                "RMAP_WEIGHT": [{
+                    "action": "permit",
+                    "match": {
+                        "ipv4": {
+                            "prefix_lists": "pf_ls_1"
+                        }
+                    },
+                    "set": {
+                        "weight": 500
+                    }
+                }]
+            }
+        }
+    }
+    result = create_route_maps(tgen, input_dict_3)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    # Configure neighbor for route map
+    input_dict_4 = {
+        "r1": {
+            "bgp": {
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "neighbor": {
+                                "r2": {
+                                    "dest_link": {
+                                        "r1": {
+                                            "route_maps": [
+                                                {"name": "RMAP_WEIGHT",
+                                                 "direction": "in"}
+                                            ]
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+    result = create_router_bgp(tgen, topo, input_dict_4)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    # Verifying best path
+    dut = "r1"
+    attribute = "weight"
+    result = verify_best_path_as_per_bgp_attribute(tgen, "ipv4", dut,
+                                                   input_dict, attribute)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    write_test_footer(tc_name)
+
+
+def test_origin_attribute(request):
+    " Verifying ORIGIN attribute functionality"
+
+    tgen = get_topogen()
+
+    # Don't run this test if we have any failure.
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    # test case name
+    tc_name = request.node.name
+    write_test_header(tc_name)
+
+    # Creating configuration from JSON
+    reset_config_on_routers(tgen)
+
+    # Api call to advertise networks
+    input_dict = {
+        "r4": {
+            "bgp": {
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "advertise_networks": [
+                                {
+                                    "network": "200.50.2.0/32"
+                                },
+                                {
+                                    "network": "200.60.2.0/32"
+                                }
+                            ]
+                        }
+                    }
+                }
+            }
+        },
+        "r2": {
+            "bgp": {
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "neighbor": {
+                                "r1": {
+                                    "dest_link": {
+                                        "r2": {"next_hop_self": True}
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        },
+        "r3": {
+            "bgp": {
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "neighbor": {
+                                "r1": {
+                                    "dest_link": {
+                                        "r3": {"next_hop_self": True}
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        },
+        "r5": {
+            "bgp": {
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "redistribute": [
+                                {"redist_type": "static"},
+                                {"redist_type": "connected"}
+                            ]
+                        }
+                    }
+                }
+            }
+        }
+    }
+    result = create_router_bgp(tgen, topo, input_dict)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    # Api call to create static routes
+    input_dict_3 = {
+        "r5": {
+            "static_routes": [
+                {
+                    "network": "200.50.2.0/32",
+                    "next_hop": "10.0.0.26"
+                },
+                {
+                    "network": "200.60.2.0/32",
+                    "next_hop": "10.0.0.26"
+                }
+            ]
+        }
+    }
+    result = create_static_routes(tgen, input_dict_3)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    # Api call to redistribute static routes
+
+    # Configure next-hop-self to bgp neighbor
+
+    # Verifying best path
+    dut = "r1"
+    attribute = "origin"
+    result = verify_best_path_as_per_bgp_attribute(tgen, "ipv4", dut,
+                                                   input_dict, attribute)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    write_test_footer(tc_name)
+
+
+def test_med_attribute(request):
+    " Verifying MED attribute functionality"
+
+    tgen = get_topogen()
+
+    # Don't run this test if we have any failure.
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    # test case name
+    tc_name = request.node.name
+    write_test_header(tc_name)
+
+    # Creating configuration from JSON
+    reset_config_on_routers(tgen)
+
+    # Api call to advertise networks
+    input_dict = {
+        "r4": {
+            "bgp":{
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "advertise_networks": [
+                                {
+                                    "network": "200.50.2.0/32"
+                                },
+                                {
+                                    "network": "200.60.2.0/32"
+                                }
+                            ]
+                        }
+                    }
+                }
+            }
+        }
+    }
+    result = create_router_bgp(tgen, topo, input_dict)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    # Api call to advertise networks
+
+
+    # Configure next-hop-self to bgp neighbor
+
+
+    # Create Prefix list
+    input_dict_3 = {
+        "r2": {
+            "prefix_lists": {
+                "ipv4": {
+                    "pf_ls_r2": [{
+                        "seqid": 10,
+                        "network": "200.0.0.0/8",
+                        "le": "32",
+                        "action": "permit"
+                    }]
+                }
+            }
+        },
+        "r3": {
+            "prefix_lists": {
+                "ipv4": {
+                    "pf_ls_r3": [{
+                        "seqid": 10,
+                        "network": "200.0.0.0/8",
+                        "le": "32",
+                        "action": "permit"
+                    }]
+                }
+            }
+        }
+    }
+    result = create_prefix_lists(tgen, input_dict_3)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    # Create route map
+    input_dict_3 = {
+        "r2": {
+            "route_maps": {
+                "RMAP_MED_R2": [{
+                    "action": "permit",
+                    "match": {
+                        "ipv4": {
+                            "prefix_lists": "pf_ls_r2"
+                        }
+                    },
+                    "set": {
+                        "med": 100
+                    }
+                }]
+            }
+        },
+        "r3": {
+            "route_maps": {
+                "RMAP_MED_R3": [{
+                    "action": "permit",
+                    "match": {
+                        "ipv4": {
+                            "prefix_lists": "pf_ls_r3"
+                        }
+                    },
+                    "set": {
+                        "med": 10
+                    }
+                }]
+            }
+        }
+    }
+    result = create_route_maps(tgen, input_dict_3)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    # Configure neighbor for route map
+    input_dict_4 = {
+        "r5": {
+            "bgp": {
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "advertise_networks": [
+                                {
+                                    "network": "200.50.2.0/32"
+                                },
+                                {
+                                    "network": "200.60.2.0/32"
+                                }
+                            ]
+                        }
+                    }
+                }
+            }
+        },
+        "r2": {
+            "bgp": {
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "neighbor": {
+                                "r4": {
+                                    "dest_link": {
+                                        "r2-link1": {
+                                            "route_maps": [
+                                                {"name": "RMAP_MED_R2",
+                                                 "direction": "in"}
+                                            ]
+                                        }
+                                    }
+                                },
+                                "r1": {
+                                    "dest_link": {
+                                        "r2": {"next_hop_self": True}
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        },
+        "r3": {
+            "bgp": {
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "neighbor": {
+                                "r1": {
+                                    "dest_link": {
+                                        "r3": {"next_hop_self": True}
+                                    }
+                                },
+                                "r5": {
+                                    "dest_link": {
+                                        "r3": {
+                                            "route_maps": [
+                                                {"name": "RMAP_MED_R3",
+                                                 "direction": "in"}
+                                            ]
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+    result = create_router_bgp(tgen, topo,  input_dict_4)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    # Verifying best path
+    dut = "r1"
+    attribute = "med"
+    result = verify_best_path_as_per_bgp_attribute(tgen, "ipv4", dut,
+                                                   input_dict, attribute)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    logger.info("Testcase %s :Passed \n", tc_name)
+
+    # Uncomment next line for debugging
+    # tgen.mininet_cli()
+
+
+def test_admin_distance(request):
+    " Verifying admin distance functionality"
+
+    tgen = get_topogen()
+
+    # Don't run this test if we have any failure.
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    # test case name
+    tc_name = request.node.name
+    write_test_header(tc_name)
+
+    # Creating configuration from JSON
+    reset_config_on_routers(tgen)
+
+    # Api call to create static routes
+    input_dict = {
+        "r2": {
+            "static_routes": [
+                {
+                    "network": "200.50.2.0/32",
+                    "admin_distance": 80,
+                    "next_hop": "10.0.0.14"
+                },
+                {
+                    "network": "200.50.2.0/32",
+                    "admin_distance": 60,
+                    "next_hop": "10.0.0.18"
+                }
+            ]
+        }
+    }
+    result = create_static_routes(tgen, input_dict)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    # Api call to redistribute static routes
+    input_dict_2 = {
+        "r2": {
+            "bgp": {
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "redistribute": [
+                                {"redist_type": "static"},
+                                {"redist_type": "connected"}
+                            ]
+                        }
+                    }
+                }
+            }
+        }
+    }
+    result = create_router_bgp(tgen, input_dict_2)
+    assert result is True, "Testcase {} : Failed \n Error: {}".format(
+        tc_name, result)
+
+    # Verifying best path
+    dut = "r1"
+    attribute = "admin_distance"
+    result = verify_best_path_as_per_admin_distance(tgen, "ipv4", dut,
+                                                    input_dict, attribute)
+    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))