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#System-wide services and functions

#URL

frinx-openconfig-system:system

#OPENCONFIG YANG

YANG models

{
    "frinx-openconfig-system:system": {
        "ntp": {
            "servers": {
                "server" [
                    {
                        "address": "",
                        "config": {
                            "address": "1",
                            "frinx-cisco-ntp-extension:vrf": ""
                        }
                    }
                ]
            }
            "frinx-cisco-ntp-extension:source-interface": {
                "config": {
                    "name": ""
                }
            }
            "frinx-cisco-ntp-extension:access-group": {
                "config": {
                    "serve-only": "",
                    "query-only": "",
                    "serve": "",
                    "peer": ""
                }
            }
        }

    }
}

#OS Configuration Commands

#IOS XE ASR920

#CLI

ntp server vrf  
ntp source 
ntp access-group peer 
ntp access-group serve 
ntp access-group serve-only 
ntp access-group query-only
#Unit

Link to github : [ios-xe-unit]