{
    "ipv4base": "10.0.0.0",
    "ipv4mask": 24,
    "ipv6base": "fd00::",
    "ipv6mask": 64,
    "link_ip_start": {"ipv4": "10.0.0.0", "v4mask": 24, "ipv6": "fd00::", "v6mask": 64},
    "lo_prefix": {"ipv4": "1.0.", "v4mask": 32, "ipv6": "2001:DB8:F::", "v6mask": 128},
    "routers": {
        "r0": {
            "links": {
                "lo": {"ipv4": "auto", "ipv6": "auto", "type": "loopback"},
                "r1-link1": {"ipv4": "auto", "ipv6": "auto"},
                "r1-link2": {"ipv4": "auto", "ipv6": "auto"},
                "r1-link3": {"ipv4": "auto", "ipv6": "auto"},
                "r1-link4": {"ipv4": "auto", "ipv6": "auto"},
                "r1-link5": {"ipv4": "auto", "ipv6": "auto"}}
        },
        "r1": {
            "links": {
                "lo": {"ipv4": "auto", "ipv6": "auto", "type": "loopback"},
                "r0-link1": {"ipv4": "auto", "ipv6": "auto"},
                "r0-link2": {"ipv4": "auto", "ipv6": "auto"},
                "r0-link3": {"ipv4": "auto", "ipv6": "auto"},
                "r0-link4": {"ipv4": "auto", "ipv6": "auto"},
                "r0-link5": {"ipv4": "auto", "ipv6": "auto"},
                "r2-link0": {"ipv4": "auto", "ipv6": "auto"}},
            "bgp": {
                "local_as": "100",
                "default_ipv4_unicast": "False",
                "address_family": {
                    "ipv6": {
                        "unicast": {
                            "neighbor": {
                                "r2": {
                                    "dest_link": {
                                        "r1-link0": {
                                            "capability": "extended-nexthop",
                                            "activate": "ipv4"
                                        }
                                    }
                                }
                            }
                        }
                    }
                }}},
        "r2": {
            "links": {
                "lo": {"ipv4": "auto", "ipv6": "auto", "type": "loopback"},
                "r1-link0": {"ipv4": "auto", "ipv6": "auto"},
                "r3": {"ipv4": "auto", "ipv6": "auto"},
                "r4": {"ipv4": "auto", "ipv6": "auto"}},
            "bgp": {
                "local_as": "200",
                "default_ipv4_unicast": "False",
                "address_family": {
                    "ipv4": {
                        "unicast": {
                            "neighbor": {
                                "r4": {"dest_link": {"r2": {"activate": "ipv4"}}}
                            }
                        }
                    },
                    "ipv6": {
                        "unicast": {
                            "neighbor": {
                                "r1": {
                                    "dest_link": {
                                        "r2-link0": {
                                            "capability": "extended-nexthop",
                                            "activate": "ipv4"
                                        }
                                    }
                                },
                                "r3": {"dest_link": {"r2": {}}}}
                        }
                    }}}},
        "r3": {
            "links": {
                "lo": {"ipv4": "auto", "ipv6": "auto", "type": "loopback"},
                "r2": {"ipv4": "auto", "ipv6": "auto"}},
            "bgp": {
                "local_as": "300",
                "default_ipv4_unicast": "False",
                "address_family": {
                    "ipv6": {"unicast": {"neighbor": {"r2": {"dest_link": {"r3": {}}}}}}
                }}},
        "r4": {
            "links": {
                "lo": {"ipv4": "auto", "ipv6": "auto", "type": "loopback"},
                "r2": {"ipv4": "auto", "ipv6": "auto"}},
            "bgp": {
                "local_as": "400",
                "address_family": {
                    "ipv4": {"unicast": {"neighbor": {"r2": {"dest_link": {"r4": {}}}}}}
                }}}}}