tests: Add topotests for MGMT daemon

1. MGMT daemon support in topotests.
2. Sanity tests for MGMTd.

Signed-off-by: nguggarigoud <nguggarigoud@vmware.com>

2 files changed, 697 insertions, 0 deletions

diff --git a/tests/topotests/mgmt_tests/test_yang_mgmt.py b/tests/topotests/mgmt_tests/test_yang_mgmt.py
new file mode 100644
index 000000000..06c18d7df
--- /dev/null
+++ b/tests/topotests/mgmt_tests/test_yang_mgmt.py
@@ -0,0 +1,540 @@
+#!/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.
+#
+"""
+
+1. Verify mgmt commit check.
+2. Verify mgmt commit apply.
+3. Verify mgmt commit abort.
+4. Verify mgmt delete config.
+5. Kill mgmtd - verify that static routes are intact.
+6. Kill mgmtd - verify that watch frr restarts.
+7. Show and CLI - Execute all the newly introduced commands of mgmtd.
+8. Verify mgmt rollback functionality.
+
+"""
+import sys
+import time
+import os
+import pytest
+import platform
+
+# 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
+from lib.topotest import version_cmp
+
+# 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,
+    verify_rib,
+    create_static_routes,
+    check_address_types,
+    step,
+    shutdown_bringup_interface,
+    stop_router,
+    start_router,
+    apply_raw_config,
+    kill_router_daemons,
+    start_router_daemons,
+)
+from lib.topolog import logger
+from lib.bgp import verify_bgp_convergence, create_router_bgp, verify_bgp_rib
+from lib.topojson import build_config_from_json
+
+pytestmark = [pytest.mark.bgpd, pytest.mark.staticd]
+
+# Global variables
+ADDR_TYPES = check_address_types()
+NETWORK = {"ipv4": ["11.0.20.1/32", "11.0.20.2/32"], "ipv6": ["2::1/128", "2::2/128"]}
+NETWORK2 = {"ipv4": "11.0.20.1/32", "ipv6": "2::1/128"}
+PREFIX1 = {"ipv4": "110.0.20.1/32", "ipv6": "20::1/128"}
+
+
+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: {}".format(testsuite_run_time))
+    logger.info("=" * 40)
+
+    logger.info("Running setup_module to create topology")
+
+    # This function initiates the topology build with Topogen...
+    json_file = "{}/yang_mgmt.json".format(CWD)
+    tgen = Topogen(json_file, mod.__name__)
+    global topo
+    topo = tgen.json_topo
+    # ... 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)
+
+    if version_cmp(platform.release(), "4.19") < 0:
+        error_msg = (
+            'These tests will not run. (have kernel "{}", '
+            "requires kernel >= 4.19)".format(platform.release())
+        )
+        pytest.skip(error_msg)
+
+    # Don't run this test if we have any failure.
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    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: %s", mod)
+
+    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)
+
+
+def populate_nh():
+    """
+    Populate nexthops.
+    """
+
+    next_hop_ip = {
+        "nh1": {
+            "ipv4": topo["routers"]["r1"]["links"]["r2-link0"]["ipv4"].split("/")[0],
+            "ipv6": topo["routers"]["r1"]["links"]["r2-link0"]["ipv6"].split("/")[0],
+        },
+        "nh2": {
+            "ipv4": topo["routers"]["r1"]["links"]["r2-link1"]["ipv4"].split("/")[0],
+            "ipv6": topo["routers"]["r1"]["links"]["r2-link1"]["ipv6"].split("/")[0],
+        },
+    }
+    return next_hop_ip
+
+
+#####################################################
+#
+#   Testcases
+#
+#####################################################
+
+
+def test_mgmt_commit_check(request):
+    """
+    Verify mgmt commit check.
+
+    """
+    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)
+
+    reset_config_on_routers(tgen)
+
+    step("Mgmt Commit check")
+    raw_config = {
+        "r1": {
+            "raw_config": [
+                "mgmt set-config /frr-routing:routing/control-plane-protocols/control-plane-protocol[type='frr-staticd:staticd'][name='staticd'][vrf='default']/frr-staticd:staticd/route-list[prefix='192.1.1.2/32'][afi-safi='frr-routing:ipv4-unicast']/path-list[table-id='0'][distance='1']/frr-nexthops/nexthop[nh-type='blackhole'][vrf='default'][gateway=''][interface='(null)']/bh-type unspec",
+                "mgmt commit check",
+            ]
+        }
+    }
+
+    result = apply_raw_config(tgen, raw_config)
+    assert result is True, "Testcase {} : Failed Error: {}".format(tc_name, result)
+
+    step("Mgmt Commit check")
+    raw_config = {
+        "r1": {
+            "raw_config": [
+                "mgmt set-config /frr-routing:routing/control-plane-protocols/control-plane-protocol[type='frr-staticd:staticd'][name='staticd'][vrf='default']/frr-staticd:staticd/route-list[prefix='192.1.1.2/32'][afi-safi='frr-routing:ipv4-unicast']/path-list[table-id='0'][distance='1']/frr-nexthops/nexthop[nh-type='blackhole'][vrf='default'][gateway=''][interface='(null)']/bh-type unspec",
+                "mgmt commit check",
+            ]
+        }
+    }
+
+    result = apply_raw_config(tgen, raw_config)
+    assert result is True, "Testcase {} : Failed Error: {}".format(tc_name, result)
+
+    step("verify that the route is not configured, as commit apply not done.")
+
+    dut = "r1"
+    protocol = "static"
+    input_dict_4 = {
+        "r2": {
+            "static_routes": [
+                {
+                    "network": "1192.1.1.2/32",
+                    "next_hop": "Null0",
+                }
+            ]
+        }
+    }
+    result = verify_rib(tgen, "ipv4", dut, input_dict_4, protocol=protocol)
+    assert (
+        result is not True
+    ), "Testcase {} : Failed" "Error: Routes is missing in RIB".format(tc_name)
+
+    write_test_footer(tc_name)
+
+
+def test_mgmt_commit_apply(request):
+    """
+    Verify mgmt commit apply.
+
+    """
+    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)
+
+    reset_config_on_routers(tgen)
+
+    step("Mgmt Commit apply with Valid Configuration")
+    raw_config = {
+        "r1": {
+            "raw_config": [
+                "mgmt set-config /frr-routing:routing/control-plane-protocols/control-plane-protocol[type='frr-staticd:staticd'][name='staticd'][vrf='default']/frr-staticd:staticd/route-list[prefix='192.1.1.20/32'][afi-safi='frr-routing:ipv4-unicast']/path-list[table-id='0'][distance='1']/frr-nexthops/nexthop[nh-type='blackhole'][vrf='default'][gateway=''][interface='(null)']/vrf default",
+                "mgmt commit apply",
+            ]
+        }
+    }
+
+    result = apply_raw_config(tgen, raw_config)
+    assert result is True, "Testcase {} : Failed Error: {}".format(tc_name, result)
+
+    step("Mgmt Commit apply with Invalid Configuration")
+    raw_config = {
+        "r1": {
+            "raw_config": [
+                "mgmt set-config /frr-routing:routing/control-plane-protocols/control-plane-protocol[type='frr-staticd:staticd'][name='staticd'][vrf='default']/frr-staticd:staticd/route-list[prefix='192.1.1.20/32'][afi-safi='frr-routing:ipv4-unicast']/path-list[table-id='0'][distance='1']/frr-nexthops/nexthop[nh-type='blackhole'][vrf='default'][gateway=''][interface='(null)']/vrf default",
+                "mgmt commit apply",
+            ]
+        }
+    }
+
+    result = apply_raw_config(tgen, raw_config)
+    assert result is not True, "Testcase {} : Failed Error: {}".format(tc_name, result)
+
+    step("verify that the route is configured")
+
+    dut = "r1"
+    protocol = "static"
+    input_dict_4 = {"r2": {"static_routes": [{"network": "192.1.1.20/32"}]}}
+    result = verify_rib(tgen, "ipv4", dut, input_dict_4, protocol=protocol)
+    assert (
+        result is True
+    ), "Testcase {} : Failed" "Error: Routes is missing in RIB".format(tc_name)
+
+    write_test_footer(tc_name)
+
+
+def test_mgmt_commit_abort(request):
+    """
+    Verify mgmt commit abort.
+
+    """
+    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)
+
+    reset_config_on_routers(tgen)
+
+    step("Mgmt Commit abort")
+    raw_config = {
+        "r1": {
+            "raw_config": [
+                "mgmt set-config /frr-routing:routing/control-plane-protocols/control-plane-protocol[type='frr-staticd:staticd'][name='staticd'][vrf='default']/frr-staticd:staticd/route-list[prefix='192.1.1.3/32'][afi-safi='frr-routing:ipv4-unicast']/path-list[table-id='0'][distance='1']/frr-nexthops/nexthop[nh-type='blackhole'][vrf='default'][gateway=''][interface='(null)']/vrf default",
+                "mgmt commit abort",
+            ]
+        }
+    }
+
+    result = apply_raw_config(tgen, raw_config)
+    assert result is True, "Testcase {} : Failed Error: {}".format(tc_name, result)
+
+    step("verify that the route is not configured")
+
+    dut = "r1"
+    protocol = "static"
+    input_dict_4 = {
+        "r2": {
+            "static_routes": [
+                {
+                    "network": "192.1.1.3/32",
+                    "next_hop": "Null0",
+                }
+            ]
+        }
+    }
+    result = verify_rib(tgen, "ipv4", dut, input_dict_4, protocol=protocol)
+    assert (
+        result is not True
+    ), "Testcase {} : Failed" "Error: Routes is missing in RIB".format(tc_name)
+
+    write_test_footer(tc_name)
+
+
+def test_mgmt_delete_config(request):
+    """
+    Verify mgmt delete config.
+
+    """
+    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)
+
+    reset_config_on_routers(tgen)
+
+    step("Mgmt - Configure a static route using commit apply")
+
+    raw_config = {
+        "r1": {
+            "raw_config": [
+                "mgmt set-config /frr-routing:routing/control-plane-protocols/control-plane-protocol[type='frr-staticd:staticd'][name='staticd'][vrf='default']/frr-staticd:staticd/route-list[prefix='192.168.1.3/32'][afi-safi='frr-routing:ipv4-unicast']/path-list[table-id='0'][distance='1']/frr-nexthops/nexthop[nh-type='blackhole'][vrf='default'][gateway=''][interface='(null)']/vrf default",
+                "mgmt commit apply",
+            ]
+        }
+    }
+
+    result = apply_raw_config(tgen, raw_config)
+    assert result is True, "Testcase {} : Failed Error: {}".format(tc_name, result)
+
+    step("Verify that the route is added to RIB")
+    dut = "r1"
+    protocol = "static"
+    input_dict_4 = {
+        "r2": {
+            "static_routes": [
+                {
+                    "network": "192.168.1.3/32",
+                    "next_hop": "Null0",
+                }
+            ]
+        }
+    }
+    result = verify_rib(tgen, "ipv4", dut, input_dict_4, protocol=protocol)
+    assert (
+        result is True
+    ), "Testcase {} : Failed" "Error: Routes is missing in RIB".format(tc_name)
+    
+    step("Mgmt delete config")
+    raw_config = {
+        "r1": {
+            "raw_config": [
+                "mgmt delete-config /frr-routing:routing/control-plane-protocols/control-plane-protocol[type='frr-staticd:staticd'][name='staticd'][vrf='default']/frr-staticd:staticd/route-list[prefix='192.168.1.3/32'][afi-safi='frr-routing:ipv4-unicast']",
+                "mgmt commit apply",
+            ]
+        }
+    }
+
+    result = apply_raw_config(tgen, raw_config)
+    assert result is True, "Testcase {} : Failed Error: {}".format(tc_name, result)
+
+    step("Verify that the route is deleted from RIB")
+    result = verify_rib(tgen, "ipv4", dut, input_dict_4, protocol=protocol)
+    assert (
+        result is not True
+    ), "Testcase {} : Failed" "Error: Routes is still present in RIB".format(tc_name)
+
+    write_test_footer(tc_name)
+
+
+def test_mgmt_chaos_stop_start_frr(request):
+    """
+    Kill mgmtd - verify that watch frr restarts.
+
+    """
+    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)
+
+    reset_config_on_routers(tgen)
+    next_hop_ip = populate_nh()
+
+    step("Configure Static route with next hop null 0")
+
+    raw_config = {
+        "r1": {
+            "raw_config": [
+                "mgmt set-config /frr-routing:routing/control-plane-protocols/control-plane-protocol[type='frr-staticd:staticd'][name='staticd'][vrf='default']/frr-staticd:staticd/route-list[prefix='192.1.11.200/32'][afi-safi='frr-routing:ipv4-unicast']/path-list[table-id='0'][distance='1']/frr-nexthops/nexthop[nh-type='blackhole'][vrf='default'][gateway=''][interface='(null)']/bh-type unspec",
+                "mgmt commit apply",
+            ]
+        }
+    }
+
+    result = apply_raw_config(tgen, raw_config)
+    assert result is True, "Testcase {} : Failed Error: {}".format(tc_name, result)
+
+    step("verify that the route is configured and present in the zebra")
+
+    dut = "r1"
+    protocol = "static"
+    input_dict_4 = {"r2": {"static_routes": [{"network": "192.1.11.200/32"}]}}
+    result = verify_rib(tgen, "ipv4", dut, input_dict_4, protocol=protocol)
+    assert (
+        result is True
+    ), "Testcase {} : Failed" "Error: Routes is missing in RIB".format(tc_name)
+
+    step("Restart frr")
+    stop_router(tgen, "r1")
+    start_router(tgen, "r1")
+    step("Verify routes are intact in zebra.")
+    result = verify_rib(tgen, "ipv4", dut, input_dict_4, protocol=protocol)
+    assert (
+        result is True
+    ), "Testcase {} : Failed" "Error: Routes is missing in RIB".format(tc_name)
+
+    step("delete the configured route and ")
+    raw_config = {
+        "r1": {
+            "raw_config": [
+                "mgmt  delete-config /frr-routing:routing/control-plane-protocols/control-plane-protocol[type='frr-staticd:staticd'][name='staticd'][vrf='default']/frr-staticd:staticd/route-list[prefix='192.1.11.200/32'][afi-safi='frr-routing:ipv4-unicast']",
+                "mgmt commit apply",
+            ]
+        }
+    }
+
+    result = apply_raw_config(tgen, raw_config)
+    assert result is True, "Testcase {} : Failed Error: {}".format(tc_name, result)
+
+    step("verify that the route is deleted and deleted from zebra")
+
+    dut = "r1"
+    protocol = "static"
+    input_dict_4 = {"r1": {"static_routes": [{"network": "192.1.11.200/32"}]}}
+    result = verify_rib(tgen, "ipv4", dut, input_dict_4, protocol=protocol)
+    assert (
+        result is not True
+    ), "Testcase {} : Failed" "Error: Routes still present in RIB".format(tc_name)
+
+    write_test_footer(tc_name)
+
+
+def test_mgmt_chaos_kill_daemon(request):
+    """
+    Kill mgmtd - verify that static routes are intact
+
+    """
+    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)
+
+    reset_config_on_routers(tgen)
+    next_hop_ip = populate_nh()
+
+    step("Configure Static route with next hop null 0")
+
+    raw_config = {
+        "r1": {
+            "raw_config": [
+                "mgmt set-config /frr-routing:routing/control-plane-protocols/control-plane-protocol[type='frr-staticd:staticd'][name='staticd'][vrf='default']/frr-staticd:staticd/route-list[prefix='192.1.11.200/32'][afi-safi='frr-routing:ipv4-unicast']/path-list[table-id='0'][distance='1']/frr-nexthops/nexthop[nh-type='blackhole'][vrf='default'][gateway=''][interface='(null)']/bh-type unspec",
+                "mgmt commit apply",
+            ]
+        }
+    }
+
+    result = apply_raw_config(tgen, raw_config)
+    assert result is True, "Testcase {} : Failed Error: {}".format(tc_name, result)
+
+    step("verify that the route is configured and present in the zebra")
+
+    dut = "r1"
+    protocol = "static"
+    input_dict_4 = {"r2": {"static_routes": [{"network": "192.1.11.200/32"}]}}
+    result = verify_rib(tgen, "ipv4", dut, input_dict_4, protocol=protocol)
+    assert (
+        result is True
+    ), "Testcase {} : Failed" "Error: Routes is missing in RIB".format(tc_name)
+
+    step("Kill static daemon on R2.")
+    kill_router_daemons(tgen, "r1", ["staticd"])
+
+    step("Bring up staticd daemon on R2.")
+    start_router_daemons(tgen, "r1", ["staticd"])
+
+    step("Verify routes are intact in zebra.")
+    result = verify_rib(tgen, "ipv4", dut, input_dict_4, protocol=protocol)
+    assert (
+        result is True
+    ), "Testcase {} : Failed" "Error: Routes is missing in RIB".format(tc_name)
+
+    step("Kill mgmt daemon on R2.")
+    kill_router_daemons(tgen, "r1", ["mgmtd"])
+
+    step("Bring up zebra daemon on R2.")
+    start_router_daemons(tgen, "r1", ["mgmtd"])
+
+    step("Verify routes are intact in zebra.")
+    result = verify_rib(tgen, "ipv4", dut, input_dict_4, protocol=protocol)
+    assert (
+        result is True
+    ), "Testcase {} : Failed" "Error: Routes is missing in RIB".format(tc_name)
+
+    write_test_footer(tc_name)
+
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))
diff --git a/tests/topotests/mgmt_tests/yang_mgmt.json b/tests/topotests/mgmt_tests/yang_mgmt.json
new file mode 100644
index 000000000..0fe3bb1db
--- /dev/null
+++ b/tests/topotests/mgmt_tests/yang_mgmt.json
@@ -0,0 +1,157 @@
+{
+    "address_types": [
+        "ipv4",
+        "ipv6"
+    ],
+    "ipv4base": "10.0.0.0",
+    "ipv4mask": 30,
+    "ipv6base": "fd00::",
+    "ipv6mask": 64,
+    "link_ip_start": {
+        "ipv4": "10.0.0.0",
+        "v4mask": 30,
+        "ipv6": "fd00::",
+        "v6mask": 64
+    },
+    "lo_prefix": {
+        "ipv4": "1.0.",
+        "v4mask": 32,
+        "ipv6": "2001:db8:f::",
+        "v6mask": 128
+    },
+    "routers": {
+        "r1": {
+            "links": {
+                "lo": {
+                    "ipv4": "auto",
+                    "ipv6": "auto",
+                    "type": "loopback"
+                },
+                "r2-link0": {
+                    "ipv4": "auto",
+                    "ipv6": "auto"
+                },
+                "r2-link1": {
+                    "ipv4": "auto",
+                    "ipv6": "auto"
+                },
+                "r3-link0": {
+                    "ipv4": "auto",
+                    "ipv6": "auto"
+                },
+                "r3-link1": {
+                    "ipv4": "auto",
+                    "ipv6": "auto"
+                }
+            }
+        },
+        "r2": {
+            "links": {
+                "lo": {
+                    "ipv4": "auto",
+                    "ipv6": "auto",
+                    "type": "loopback"
+                },
+                "r1-link0": {
+                    "ipv4": "auto",
+                    "ipv6": "auto"
+                },
+                "r1-link1": {
+                    "ipv4": "auto",
+                    "ipv6": "auto"
+                },
+                "r3": {
+                    "ipv4": "auto",
+                    "ipv6": "auto"
+                }
+            },
+            "bgp": {
+                "local_as": "100",
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "neighbor": {
+                                "r3": {
+                                    "dest_link": {
+                                        "r2": {
+                                            "keepalivetimer": 1,
+                                            "holddowntimer": 4
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    },
+                    "ipv6": {
+                        "unicast": {
+                            "neighbor": {
+                                "r3": {
+                                    "dest_link": {
+                                        "r2": {
+                                            "keepalivetimer": 1,
+                                            "holddowntimer": 4
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        },
+        "r3": {
+            "links": {
+                "lo": {
+                    "ipv4": "auto",
+                    "ipv6": "auto",
+                    "type": "loopback"
+                },
+                "r2": {
+                    "ipv4": "auto",
+                    "ipv6": "auto"
+                },
+                "r1-link0": {
+                    "ipv4": "auto",
+                    "ipv6": "auto"
+                },
+                "r1-link1": {
+                    "ipv4": "auto",
+                    "ipv6": "auto"
+                }
+            },
+            "bgp": {
+                "local_as": "200",
+                "address_family": {
+                    "ipv4": {
+                        "unicast": {
+                            "neighbor": {
+                                "r2": {
+                                    "dest_link": {
+                                        "r3": {
+                                            "keepalivetimer": 1,
+                                            "holddowntimer": 4
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    },
+                    "ipv6": {
+                        "unicast": {
+                            "neighbor": {
+                                "r2": {
+                                    "dest_link": {
+                                        "r3": {
+                                            "keepalivetimer": 1,
+                                            "holddowntimer": 4
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+}