def METHOD_NAME(router):
    output = json.loads(router.vtysh_cmd("show ip bgp neighbor 192.168.255.2 json"))
    expected = {
        "192.168.255.2": {
            "bgpState": "Established",
            "addressFamilyInfo": {"ipv4Unicast": {"acceptedPrefixCounter": 0}},
        }
    }
    return topotest.json_cmp(output, expected)