{"id":171,"date":"2025-05-11T09:39:00","date_gmt":"2025-05-11T00:39:00","guid":{"rendered":"https:\/\/ccna-curriculum.tech-village.co.jp\/?p=171"},"modified":"2025-10-15T14:55:42","modified_gmt":"2025-10-15T05:55:42","slug":"ntp","status":"publish","type":"post","link":"https:\/\/ccna-curriculum.tech-village.co.jp\/?p=171","title":{"rendered":"NTP"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">NTP\u3068\u306f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><span class=\"swl-marker mark_yellow\">NTP\uff08Network Time Protocol\uff09<\/span><\/strong>\u306f\u3001\u30d1\u30bd\u30b3\u30f3\u3084\u30b9\u30de\u30db\u3001\u30eb\u30fc\u30bf\u306a\u3069\u306e\u6642\u8a08\u3092\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7d4c\u7531\u3067\u6b63\u3057\u304f\u305d\u308d\u3048\u308b\u305f\u3081\u306e\u4ed5\u7d44\u307f\u3067\u3059\u3002\u3053\u308c\u3092\u4f7f\u3046\u3068\u6b21\u306e\u3088\u3046\u306a\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30ed\u30b0\uff08\u8a18\u9332\uff09\u306e\u6642\u9593\u304c\u6b63\u3057\u304f\u6b8b\u308b<\/li>\n\n\n\n<li>\u4e88\u7d04\u3057\u305f\u30b5\u30fc\u30d3\u30b9\u3092\u6b63\u3057\u3044\u6642\u9593\u306b\u52d5\u304b\u305b\u308b<\/li>\n\n\n\n<li>\u8a3c\u660e\u66f8\u3092\u4f7f\u3063\u305f\u8a8d\u8a3c\u304c\u6b63\u3057\u304f\u52d5\u304f<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">NTP\u306e\u30d1\u30b1\u30c3\u30c8<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">NTP\u3067\u306f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3068\u30b5\u30fc\u30d0\u304c\u300c123\u756a\u30dd\u30fc\u30c8\u300d\u3092\u4f7f\u3063\u3066\u3084\u308a\u53d6\u308a\u3057\u307e\u3059\u3002\u4f7f\u3046\u306e\u306f\u8efd\u3044\u901a\u4fe1\u65b9\u5f0f\u3067\u3042\u308bUDP\u3067\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u901a\u4fe1\u65b9\u5411<\/th><th>\u4f7f\u7528\u3059\u308b\u30dd\u30fc\u30c8\u756a\u53f7<\/th><\/tr><\/thead><tbody><tr><td>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304b\u3089\u30b5\u30fc\u30d0\u3078<\/td><td>UDP 123<\/td><\/tr><tr><td>\u30b5\u30fc\u30d0\u304b\u3089\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3078<\/td><td>UDP 123<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">NTP\u306e\u968e\u5c64\uff08stratum\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">NTP\u30b5\u30fc\u30d0\u306f\u968e\u5c64\u7684\u306b\u63a5\u7d9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u4e0a\u4f4d\u304b\u3089\u4e0b\u4f4d\u3078\u3068\u6642\u523b\u304c\u4f1d\u308f\u3063\u3066\u3044\u304f\u4ed5\u7d44\u307f\u3067\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u968e\u5c64<\/th><th>\u8aac\u660e<\/th><\/tr><\/thead><tbody><tr><td>Stratum 0<\/td><td>\u539f\u5b50\u6642\u8a08\u3084GPS\u306a\u3069\u306e\u6b63\u78ba\u306a\u6642\u523b\u6e90\uff08NTP\u81ea\u4f53\u3067\u306f\u306a\u3044\uff09<\/td><\/tr><tr><td>Stratum 1<\/td><td>Stratum 0\u3092\u76f4\u63a5\u53c2\u7167\u3059\u308b\u30b5\u30fc\u30d0\uff08\u6700\u3082\u4e0a\u4f4d\u306eNTP\u30b5\u30fc\u30d0\uff09<\/td><\/tr><tr><td>Stratum 2<\/td><td>Stratum 1\u306e\u30b5\u30fc\u30d0\u3068\u540c\u671f\u3059\u308b\u30b5\u30fc\u30d0<\/td><\/tr><tr><td>Stratum 3\u4ee5\u964d<\/td><td>\u3055\u3089\u306b\u4e0b\u4f4d\u306e\u30b5\u30fc\u30d0\u3002\u6700\u5927\u3067Stratum 15\u307e\u3067<\/td><\/tr><tr><td>Stratum 16<\/td><td>\u540c\u671f\u3067\u304d\u3066\u3044\u306a\u3044\u72b6\u614b\u3092\u610f\u5473\u3059\u308b<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">NTP\u306e\u540c\u671f\u30e2\u30fc\u30c9<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">NTP\u306b\u306f\u3044\u304f\u3064\u304b\u306e\u52d5\u4f5c\u30e2\u30fc\u30c9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u30e2\u30fc\u30c9<\/th><th>\u8aac\u660e<\/th><\/tr><\/thead><tbody><tr><td>Server \/ Client\u30e2\u30fc\u30c9<\/td><td>\u4e00\u822c\u7684\u306b\u4f7f\u308f\u308c\u308b\u65b9\u5f0f\u3002\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u30b5\u30fc\u30d0\u306b\u6642\u523b\u3092\u5408\u308f\u305b\u308b<\/td><\/tr><tr><td>Symmetric\u30e2\u30fc\u30c9<\/td><td>\u540c\u3058\u968e\u5c64\u306b\u3044\u308b\u30b5\u30fc\u30d0\u540c\u58eb\u304c\u3001\u304a\u4e92\u3044\u306b\u6642\u523b\u3092\u5408\u308f\u305b\u308b\u4ed5\u7d44\u307f<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">NTP\u306e\u4ed5\u7d44\u307f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">NTP\u306f\u5358\u306b\u30b5\u30fc\u30d0\u306e\u6642\u523b\u3092\u30b3\u30d4\u30fc\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u901a\u4fe1\u306b\u304b\u304b\u308b\u9045\u308c\u6642\u9593\u3092\u8a08\u7b97\u3057\u3066\u6b63\u78ba\u306b\u88dc\u6b63\u3057\u307e\u3059\u3002\u3084\u308a\u53d6\u308a\u3055\u308c\u308b\u6642\u523b\u60c5\u5831\u306f\u6b21\u306e4\u3064\u3067\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u6642\u523b\u60c5\u5831<\/th><th>\u5185\u5bb9<\/th><\/tr><\/thead><tbody><tr><td>T1<\/td><td>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u554f\u3044\u5408\u308f\u305b\u3092\u9001\u3063\u305f\u6642\u523b<\/td><\/tr><tr><td>T2<\/td><td>\u30b5\u30fc\u30d0\u304c\u305d\u306e\u554f\u3044\u5408\u308f\u305b\u3092\u53d7\u3051\u53d6\u3063\u305f\u6642\u523b<\/td><\/tr><tr><td>T3<\/td><td>\u30b5\u30fc\u30d0\u304c\u8fd4\u4e8b\u3092\u9001\u3063\u305f\u6642\u523b<\/td><\/tr><tr><td>T4<\/td><td>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u8fd4\u4e8b\u3092\u53d7\u3051\u53d6\u3063\u305f\u6642\u523b<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">NTP\u306e2036\u5e74\u554f\u984c<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">NTP\u3067\u306f\u6642\u9593\u3092\u300c1900\u5e741\u67081\u65e5\u304b\u3089\u306e\u79d2\u6570\u300d\u3067\u6570\u3048\u3066\u3044\u307e\u3059\u300232\u30d3\u30c3\u30c8\u3067\u6570\u3048\u3066\u3044\u308b\u305f\u3081\u4e0a\u9650\u304c\u3042\u308a\u30012036\u5e742\u67086\u65e5\u3067\u9650\u754c\u3092\u8fce\u3048\u307e\u3059\u3002\u3053\u308c\u3092\u8d85\u3048\u308b\u3068\u300c\u6642\u8a08\u304c\u30ea\u30bb\u30c3\u30c8\u3055\u308c\u305f\u300d\u3068\u8aa4\u89e3\u3057\u3066\u3057\u307e\u3046\u53ef\u80fd\u6027\u304c\u3042\u308a\u3001NTP\u306e2036\u5e74\u554f\u984c\u3068\u547c\u3070\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SNTP\u3068\u306f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><span class=\"swl-marker mark_yellow\">SNTP\uff08Simple Network Time Protocol\uff09<\/span><\/strong>\u306fNTP\u306e\u7c21\u6613\u7248\u3067\u3059\u3002\u30b5\u30fc\u30d0\u306b\u306f\u306a\u3089\u305a\u3001\u6642\u523b\u3092\u3082\u3089\u3046\u3060\u3051\u306e\u4ed5\u7d44\u307f\u3067\u3059\u3002\u5c0f\u3055\u306a\u6a5f\u5668\u3084\u5358\u7d14\u306a\u74b0\u5883\u3067\u3088\u304f\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Cisco\u6a5f\u5668\u306e\u6642\u523b\u8a2d\u5b9a<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Cisco\u30eb\u30fc\u30bf\u3084Catalyst\u30b9\u30a4\u30c3\u30c1\u306b\u6b63\u3057\u3044\u6642\u523b\u3092\u8a2d\u5b9a\u3057\u3066\u304a\u304f\u3053\u3068\u306f\u3001\u30ed\u30b0\u7ba1\u7406\u3084\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u76e3\u67fb\u306e\u305f\u3081\u306b\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002\u6642\u523b\u8a2d\u5b9a\u306e\u65b9\u6cd5\u306f\u5927\u304d\u304f\u5206\u3051\u3066 <strong>\u624b\u52d5\u8a2d\u5b9a<\/strong>\u3001<strong>NTP<\/strong>\u3001<strong>SNTP<\/strong> \u306e3\u7a2e\u985e\u304c\u3042\u308a\u307e\u3059\u3002\u3069\u306e\u65b9\u6cd5\u3067\u3082\u307e\u305a\u6700\u521d\u306b\u884c\u3046\u306e\u304c <strong>\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306e\u8a2d\u5b9a<\/strong> \u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f<span class=\"swl-marker mark_yellow\"> <strong>UTC\uff08\u5354\u5b9a\u4e16\u754c\u6642\uff09<\/strong><\/span> \u306b\u306a\u3063\u3066\u304a\u308a\u3001\u65e5\u672c\u3067\u4f7f\u7528\u3059\u308b\u5834\u5408\u306f <strong><span class=\"swl-marker mark_yellow\">JST\uff08\u65e5\u672c\u6a19\u6e96\u6642\uff09\uff1dUTC+9\u6642\u9593<\/span><\/strong> \u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# clock timezone JST 9<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u203b <code>+9<\/code> \u3068\u6307\u5b9a\u3057\u3066\u3082\u540c\u3058\u610f\u5473\u306b\u306a\u308a\u307e\u3059\u3002<code>show run<\/code> \u3067\u306f <code>clock timezone JST 9 0<\/code> \u306e\u3088\u3046\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u624b\u52d5\u8a2d\u5b9a\uff1a\u30b7\u30b9\u30c6\u30e0\u30af\u30ed\u30c3\u30af<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Cisco\u6a5f\u5668\u306b\u306f\u300c\u30b7\u30b9\u30c6\u30e0\u30af\u30ed\u30c3\u30af\u300d\u3068\u300c\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u30af\u30ed\u30c3\u30af\u300d\u306e2\u3064\u306e\u6642\u8a08\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u30b7\u30b9\u30c6\u30e0\u30af\u30ed\u30c3\u30af<\/strong>\uff1a\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u7684\u306a\u6642\u8a08\u3002\u7cbe\u5ea6\u306f\u9ad8\u3044\u304c\u518d\u8d77\u52d5\u3067\u521d\u671f\u5316\u3055\u308c\u308b\u3002<\/li>\n\n\n\n<li><strong>\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u30af\u30ed\u30c3\u30af<\/strong>\uff1a\u30d0\u30c3\u30c6\u30ea\u99c6\u52d5\u306e\u30ab\u30ec\u30f3\u30c0\u30fc\u6a5f\u80fd\u3002\u518d\u8d77\u52d5\u6642\u306b\u30b7\u30b9\u30c6\u30e0\u30af\u30ed\u30c3\u30af\u306e\u521d\u671f\u5024\u3068\u3057\u3066\u4f7f\u308f\u308c\u308b\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b7\u30b9\u30c6\u30e0\u30af\u30ed\u30c3\u30af\u306f\u3001\u30e1\u30e2\u30ea\u4e0a\u3067\u52d5\u4f5c\u3059\u308b\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u7684\u306a\u6642\u8a08\u3067\u3059\u3002\u73fe\u5728\u306e\u6642\u523b\u306f\u6b21\u306e\u30b3\u30de\u30f3\u30c9\u3067\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># show clock<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6642\u523b\u3092\u624b\u52d5\u3067\u8a2d\u5b9a\u3059\u308b\u306b\u306f <code>clock set<\/code> \u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># clock set hh:mm:ss DATE MONTH YEAR<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u3048\u3070\u30012020\u5e747\u670824\u65e515\u664220\u5206\u306b\u8a2d\u5b9a\u3059\u308b\u5834\u5408\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># clock set 15:20:00 24 Jul 2020<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u305f\u3060\u3057\u3001\u3053\u306e\u8a2d\u5b9a\u306f\u518d\u8d77\u52d5\u3059\u308b\u3068\u6d88\u3048\u3066\u3057\u307e\u3046\u70b9\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u624b\u52d5\u8a2d\u5b9a\uff1a\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u30af\u30ed\u30c3\u30af<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u30af\u30ed\u30c3\u30af\u306f\u4ee5\u4e0b\u3067\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># show calendar<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u624b\u52d5\u8a2d\u5b9a\u306f\u6b21\u306e\u3088\u3046\u306b\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># calendar set hh:mm:ss DATE MONTH YEAR<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u307e\u305f\u3001\u30b7\u30b9\u30c6\u30e0\u30af\u30ed\u30c3\u30af\u304c\u6b63\u78ba\u306a\u5834\u5408\u3001\u305d\u308c\u3092\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u30af\u30ed\u30c3\u30af\u3078\u540c\u671f\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># clock update-calendar<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u3088\u3046\u306b\u3057\u3066\u3001\u30b7\u30b9\u30c6\u30e0\u30af\u30ed\u30c3\u30af\u3068\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u30af\u30ed\u30c3\u30af\u306e\u6642\u523b\u3092\u4e00\u81f4\u3055\u305b\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u30b5\u30de\u30fc\u30bf\u30a4\u30e0\u8a2d\u5b9a\uff08\u53c2\u8003\uff09<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u65e5\u672c\u3067\u306f\u30b5\u30de\u30fc\u30bf\u30a4\u30e0\u3092\u63a1\u7528\u3057\u3066\u3044\u307e\u305b\u3093\u304c\u3001Cisco\u6a5f\u5668\u306b\u306f\u30b5\u30de\u30fc\u30bf\u30a4\u30e0\u8a2d\u5b9a\u306e\u6a5f\u80fd\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# clock summer-time timezone recurring week day month hh:mm week day month hh:mm offset<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u3048\u3070\u30012020\u5e748\u67081\u65e59\u6642\u304b\u30892020\u5e749\u670831\u65e59\u6642\u307e\u3067\u3092\u30b5\u30de\u30fc\u30bf\u30a4\u30e0\u3068\u3059\u308b\u5834\u5408\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# clock summer-time JST date 1 Aug 2020 9:00 31 Sep 2020 9:00<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>offset<\/code> \u306f\u30b5\u30de\u30fc\u30bf\u30a4\u30e0\u3067\u8ffd\u52a0\u3055\u308c\u308b\u6642\u9593\uff08\u901a\u5e3860\u5206\uff09\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-icon_pen wp-block-paragraph\">\u8a66\u9a13\u5bfe\u7b56\uff1a\u300cCisco\u6a5f\u5668\u306e\u6642\u523b\u8a2d\u5b9a\u306f\u307e\u305a\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u304b\u3089\u300d\u300c\u30b7\u30b9\u30c6\u30e0\u30af\u30ed\u30c3\u30af\u3068\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u30af\u30ed\u30c3\u30af\u306e\u9055\u3044\u300d\u300cclock set \u306f\u518d\u8d77\u52d5\u3067\u6d88\u3048\u308b\u300d\u3068\u3044\u3046\u70b9\u3092\u62bc\u3055\u3048\u3066\u304a\u304f\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">NTP\u306e\u57fa\u672c\u8a2d\u5b9a<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Cisco\u30eb\u30fc\u30bf\u3084Catalyst\u30b9\u30a4\u30c3\u30c1\u306f\u3001NTP\uff08Network Time Protocol\uff09\u3092\u4f7f\u3063\u3066\u5916\u90e8\u306eNTP\u30b5\u30fc\u30d0\u3068\u6642\u523b\u540c\u671f\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u6b63\u3057\u3044\u6642\u523b\u3092\u4fdd\u3064\u3053\u3068\u3067\u3001\u30ed\u30b0\u306e\u6574\u5408\u6027\u3084\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u7ba1\u7406\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">NTP\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u8a2d\u5b9a<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5916\u90e8\u306eNTP\u30b5\u30fc\u30d0\u3068\u540c\u671f\u3059\u308b\u306b\u306f <code>ntp server<\/code> \u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u3044\u307e\u3059\u3002\u8907\u6570\u306e\u30b5\u30fc\u30d0\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u3001\u305d\u306e\u5834\u5408\u306f <code>prefer<\/code> \u3092\u4ed8\u3051\u3066\u512a\u5148\u30b5\u30fc\u30d0\u3092\u6c7a\u3081\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# ntp server &#91; ip-address | hostname ] &#91; prefer ]<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# ntp server 192.168.1.254\n(config)# ntp server ntp.nict.jp prefer<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u30db\u30b9\u30c8\u540d\u3092\u6307\u5b9a\u3059\u308b\u5834\u5408\u306f\u3001DNS\u306b\u3088\u308b\u540d\u524d\u89e3\u6c7a\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u9001\u4fe1\u5143\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u6307\u5b9a<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u8907\u6570\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u6301\u3064\u6a5f\u5668\u3067\u306f\u3001NTP\u30d1\u30b1\u30c3\u30c8\u3092\u9001\u4fe1\u3059\u308b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u660e\u793a\u7684\u306b\u6307\u5b9a\u3057\u3066\u304a\u304f\u3068\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u304c\u5bb9\u6613\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# ntp source interface<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# ntp source GigabitEthernet0\/0<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">NTP\u30b5\u30fc\u30d0\u3068\u3057\u3066\u52d5\u4f5c\u3055\u305b\u308b\uff08\u30de\u30b9\u30bf\u30fc\u30af\u30ed\u30c3\u30af\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30af\u30ed\u30fc\u30ba\u30c9\u74b0\u5883\u3067\u5916\u90e8\u306bNTP\u30b5\u30fc\u30d0\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u3001Cisco\u6a5f\u5668\u81ea\u8eab\u3092NTP\u30b5\u30fc\u30d0\u3068\u3057\u3066\u5229\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u3001\u5185\u90e8\u306e\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u30af\u30ed\u30c3\u30af\u3092\u57fa\u6e96\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# ntp master &#91; stratum ]<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>stratum<\/code> \u306f1\uff5e15\u3067\u6307\u5b9a\u53ef\u80fd\uff08\u7701\u7565\u6642\u306f8\uff09<\/li>\n\n\n\n<li>\u5024\u304c\u5c0f\u3055\u3044\u307b\u3069\u7cbe\u5ea6\u306e\u9ad8\u3044\u30b5\u30fc\u30d0\u3092\u610f\u5473\u3059\u308b<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# ntp master 5<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u30af\u30ed\u30c3\u30af\u306e\u540c\u671f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306fNTP\u540c\u671f\u5bfe\u8c61\u306f\u30b7\u30b9\u30c6\u30e0\u30af\u30ed\u30c3\u30af\u306e\u307f\u3067\u3059\u3002\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u30af\u30ed\u30c3\u30af\u3082\u540c\u671f\u3055\u305b\u305f\u3044\u5834\u5408\u306f\u4ee5\u4e0b\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# ntp update-calendar<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">NTP\u306e\u30b9\u30c6\u30fc\u30bf\u30b9\u78ba\u8a8d<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">NTP\u30b5\u30fc\u30d0\u3068\u540c\u671f\u3067\u304d\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u306f <code>show ntp associations<\/code> \u30b3\u30de\u30f3\u30c9\u3067\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b5\u30fc\u30d0IP\u30a2\u30c9\u30ec\u30b9\u306e\u5de6\u306b <code>*<\/code> \u304c\u4ed8\u3044\u3066\u3044\u308c\u3070\u540c\u671f\u4e2d<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u78ba\u8a8d\u9805\u76ee\u306e\u610f\u5473\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u9805\u76ee<\/th><th>\u610f\u5473<\/th><\/tr><\/thead><tbody><tr><td>address<\/td><td>NTP\u30b5\u30fc\u30d0\u306eIP\u30a2\u30c9\u30ec\u30b9<\/td><\/tr><tr><td>ref clock<\/td><td>NTP\u30b5\u30fc\u30d0\u304c\u53c2\u7167\u3057\u3066\u3044\u308b\u4e0a\u4f4d\u30b5\u30fc\u30d0<\/td><\/tr><tr><td>st<\/td><td>\u30b9\u30c8\u30e9\u30bf\u30e0\u5024<\/td><\/tr><tr><td>when<\/td><td>\u6700\u5f8c\u306bNTP\u30d1\u30b1\u30c3\u30c8\u3092\u53d7\u4fe1\u3057\u3066\u304b\u3089\u306e\u7d4c\u904e\u79d2\u6570<\/td><\/tr><tr><td>poll<\/td><td>\u6b21\u306e\u554f\u3044\u5408\u308f\u305b\u307e\u3067\u306e\u9593\u9694\uff08\u79d2\uff09<\/td><\/tr><tr><td>reach<\/td><td>\u5230\u9054\u53ef\u80fd\u6027\uff088\u9032\u6570\uff09<\/td><\/tr><tr><td>delay<\/td><td>\u5f80\u5fa9\u9045\u5ef6\u6642\u9593\uff08ms\uff09<\/td><\/tr><tr><td>offset<\/td><td>\u30b5\u30fc\u30d0\u3068\u306e\u5dee\uff08ms\uff09<\/td><\/tr><tr><td>disp<\/td><td>\u3086\u3089\u304e\uff08ms\uff09<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u3055\u3089\u306b <code>show ntp status<\/code> \u3067\u3082\u540c\u671f\u72b6\u6cc1\u3092\u78ba\u8a8d\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6b63\u5e38\u540c\u671f\u4e2d\uff1a <code>Clock is synchronized, stratum 3, reference is 192.168.1.254<\/code><\/li>\n\n\n\n<li>\u540c\u671f\u3057\u3066\u3044\u306a\u3044\u5834\u5408\uff1a <code>Clock is unsynchronized, stratum 16, no reference clock.<\/code><\/li>\n<\/ul>\n\n\n\n<p class=\"is-style-icon_pen wp-block-paragraph\">\u8a66\u9a13\u5bfe\u7b56\uff1a\u300c\u540c\u671f\u3067\u304d\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u306f <code>*<\/code> \u30de\u30fc\u30af\u3092\u898b\u308b\u300d\u300c\u540c\u671f\u3057\u3066\u3044\u306a\u3044\u5834\u5408\u306f stratum 16\u300d\u3068\u3044\u3063\u305f\u70b9\u304c\u3088\u304f\u51fa\u984c\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u30b7\u30b9\u30b3\u30c7\u30d0\u30a4\u30b9\uff1aNTP\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u8a2d\u5b9a<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Cisco\u30eb\u30fc\u30bf\u3084Catalyst\u30b9\u30a4\u30c3\u30c1\u306f\u3001\u7279\u5225\u306a\u8a2d\u5b9a\u3092\u3057\u306a\u3051\u308c\u3070\u4ee5\u4e0b\u306e\u3088\u3046\u306aNTP\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u72b6\u614b\u3067\u52d5\u4f5c\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u6a5f\u80fd<\/th><th>\u30c7\u30d5\u30a9\u30eb\u30c8\u5024<\/th><\/tr><\/thead><tbody><tr><td>NTP\u8a8d\u8a3c<\/td><td>\u7121\u52b9\uff08\u8a8d\u8a3c\u9375\u306f\u672a\u8a2d\u5b9a\uff09<\/td><\/tr><tr><td>NTP\u30d4\u30a2\uff0f\u30a2\u30bd\u30b7\u30a8\u30fc\u30b7\u30e7\u30f3<\/td><td>\u672a\u8a2d\u5b9a<\/td><\/tr><tr><td>NTP\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8<\/td><td>\u7121\u52b9\uff08\u3069\u306eI\/F\u3082\u9001\u4fe1\u3057\u306a\u3044\uff09<\/td><\/tr><tr><td>NTP\u30a2\u30af\u30bb\u30b9\u5236\u9650<\/td><td>ACL\u672a\u6307\u5b9a<\/td><\/tr><tr><td>NTP\u9001\u4fe1\u5143IP\u30a2\u30c9\u30ec\u30b9<\/td><td>\u767a\u4fe1\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u4f7f\u7528<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u305f\u3081\u3001\u521d\u671f\u72b6\u614b\u3067\u306f\u5916\u90e8\u3068\u6642\u523b\u540c\u671f\u3067\u304d\u308b\u3088\u3046\u306b\u306f\u306a\u3063\u3066\u3044\u307e\u305b\u3093\u3002\u57fa\u672c\u8a2d\u5b9a\uff08<code>ntp server<\/code> \u306a\u3069\uff09\u3092\u884c\u3063\u3066\u521d\u3081\u3066\u52d5\u4f5c\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">NTP\u306e3\u3064\u306e\u540c\u671f\u30e2\u30fc\u30c9<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">NTP\u3067\u306f\u3001\u6a5f\u5668\u540c\u58eb\u306e\u6642\u523b\u540c\u671f\u3092\u884c\u3046\u65b9\u6cd5\u3068\u3057\u3066\u4ee5\u4e0b\u306e3\u3064\u306e\u30e2\u30fc\u30c9\u304c\u3042\u308a\u307e\u3059\u3002\u5b9f\u969b\u306b\u3088\u304f\u5229\u7528\u3055\u308c\u308b\u306e\u306f <strong>Server \/ Client\u30e2\u30fc\u30c9<\/strong> \u3067\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>NTP\u30e2\u30fc\u30c9<\/th><th>\u8aac\u660e<\/th><th>\u8a2d\u5b9a\u30b3\u30de\u30f3\u30c9\u4f8b<\/th><\/tr><\/thead><tbody><tr><td><strong>Server \/ Client<\/strong><\/td><td>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u30b5\u30fc\u30d0\u306b\u540c\u671f\u3092\u53d6\u308b\u3002\u6700\u3082\u4e00\u822c\u7684\u3002<\/td><td><code>(config)# ntp server 192.168.1.10<\/code><\/td><\/tr><tr><td><strong>Symmetric Active \/ Passive\uff08\u5bfe\u79f0\u30e2\u30fc\u30c9 \/ \u30d4\u30a2\u30e2\u30fc\u30c9\uff09<\/strong><\/td><td>\u540c\u3058\u968e\u5c64\u306b\u5c5e\u3059\u308bNTP\u30b5\u30fc\u30d0\u540c\u58eb\u3067\u6642\u523b\u3092\u540c\u671f\u3059\u308b\u3002<\/td><td><code>(config)# ntp peer 192.168.1.20<\/code><\/td><\/tr><tr><td><strong>Broadcast<\/strong><\/td><td>\u30b5\u30fc\u30d0\u304c\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u3067\u6642\u523b\u3092\u914d\u4fe1\u3057\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u53d7\u4fe1\u3059\u308b\u3002<\/td><td><code>(config-if)# ntp broadcast<\/code><code>(config-if)# ntp broadcast client<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"is-style-icon_pen wp-block-paragraph\">\u8a66\u9a13\u5bfe\u7b56\uff1a\u300cServer\/Client\u304c\u57fa\u672c\u300d\u300cSymmetric\u306f\u30b5\u30fc\u30d0\u9593\u300d\u300cBroadcast\u306fLAN\u5411\u3051\u300d\u3068\u3044\u3046\u6574\u7406\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">NTP\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u8a2d\u5b9a<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">NTP\u30b5\u30fc\u30d0\u3068\u540c\u671f\u3059\u308b\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u8a2d\u5b9a\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# ntp server &#91; ip-address | hostname ] &#91; prefer ]<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>ip-address<\/strong>\uff1aNTP\u30b5\u30fc\u30d0\u306eIP\u30a2\u30c9\u30ec\u30b9<\/li>\n\n\n\n<li><strong>hostname<\/strong>\uff1aNTP\u30b5\u30fc\u30d0\u306e\u30db\u30b9\u30c8\u540d\uff08DNS\u89e3\u6c7a\u304c\u5fc5\u8981\uff09<\/li>\n\n\n\n<li><strong>prefer<\/strong>\uff1a\u8907\u6570\u30b5\u30fc\u30d0\u3092\u6307\u5b9a\u3057\u305f\u5834\u5408\u3001\u512a\u5148\u3059\u308b\u30b5\u30fc\u30d0\u3092\u660e\u793a<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# ntp server 192.168.1.254 prefer<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">NTP\u30d4\u30a2\uff08\u5bfe\u79f0\u30e2\u30fc\u30c9\uff09\u306e\u8a2d\u5b9a<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u540c\u3058\u968e\u5c64\u306eNTP\u30b5\u30fc\u30d0\u540c\u58eb\u3092\u540c\u671f\u3055\u305b\u305f\u3044\u5834\u5408\u306f\u3001\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# ntp peer ip-address &#91; version number ] &#91; key id ] &#91; source interface ] &#91; prefer ]<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>ip-address<\/strong>\uff1a\u540c\u671f\u5bfe\u8c61\u306e\u30d4\u30a2\u306e\u30a2\u30c9\u30ec\u30b9<\/li>\n\n\n\n<li><strong>version number<\/strong>\uff1aNTP\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\uff081\uff5e4\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u306f3\uff09<\/li>\n\n\n\n<li><strong>key id<\/strong>\uff1a\u8a8d\u8a3c\u8a2d\u5b9a\u304c\u3042\u308b\u5834\u5408\u306b\u6307\u5b9a<\/li>\n\n\n\n<li><strong>source interface<\/strong>\uff1a\u9001\u4fe1\u5143IP\u30a2\u30c9\u30ec\u30b9\u306b\u4f7f\u3046I\/F<\/li>\n\n\n\n<li><strong>prefer<\/strong>\uff1a\u8907\u6570\u30d4\u30a2\u3092\u6307\u5b9a\u3057\u305f\u5834\u5408\u306e\u512a\u5148\u30d4\u30a2\u6307\u5b9a<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">NTP\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u306e\u8a2d\u5b9a<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">LAN\u5185\u3067\u30b5\u30fc\u30d0\u304c\u4e00\u6589\u306b\u6642\u523b\u3092\u914d\u4fe1\u3057\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u53d7\u4fe1\u3059\u308b\u65b9\u5f0f\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b5\u30fc\u30d0\u5074\uff08\u9001\u4fe1\uff09\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# interface GigabitEthernet0\/0\n(config-if)# ntp broadcast &#91; version number ] &#91; key id ] &#91; destination-address ]<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u5074\uff08\u53d7\u4fe1\uff09\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# interface GigabitEthernet0\/0\n(config-if)# ntp broadcast client<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u306a\u304a\u3001<strong>NTPv3\u3067\u306f\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8<\/strong>\u3092\u4f7f\u7528\u3057\u307e\u3059\u304c\u3001<strong>NTPv4\u3067\u306f\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8<\/strong>\u3092\u5229\u7528\u3057\u307e\u3059\u3002\u305d\u306e\u5834\u5408\u3001\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u306b\u7f6e\u304d\u63db\u3048\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b5\u30fc\u30d0\u5074\uff1a<code>ntp multicast<\/code><\/li>\n\n\n\n<li>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u5074\uff1a<code>ntp multicast client<\/code><\/li>\n<\/ul>\n\n\n\n<p class=\"is-style-icon_pen wp-block-paragraph\">\u8a66\u9a13\u5bfe\u7b56\uff1a\u300cNTP\u306e3\u3064\u306e\u30e2\u30fc\u30c9\u3068\u7528\u9014\u300d\u300cNTPv3\u306f\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u3001NTPv4\u306f\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8\u300d\u300c\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306fNTP\u306f\u7121\u52b9\u300d\u3068\u3044\u3046\u70b9\u3092\u3057\u3063\u304b\u308a\u6574\u7406\u3057\u3066\u899a\u3048\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">NTP\uff1a\u8a8d\u8a3c\u3068\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u8a2d\u5b9a<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Cisco\u30c7\u30d0\u30a4\u30b9\u3067\u306f\u3001NTP\u3092\u5358\u7d14\u306b\u6642\u523b\u540c\u671f\u306e\u4ed5\u7d44\u307f\u3068\u3057\u3066\u5229\u7528\u3059\u308b\u3060\u3051\u3067\u306a\u304f\u3001<strong>\u8a8d\u8a3c\u3084\u30a2\u30af\u30bb\u30b9\u5236\u5fa1<\/strong>\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u4fe1\u983c\u3067\u304d\u308b\u30c7\u30d0\u30a4\u30b9\u3068\u306e\u307f\u901a\u4fe1\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\u3068\u3057\u3066\u91cd\u8981\u3067\u3042\u308a\u3001\u7279\u306b\u5916\u90e8\u306eNTP\u30b5\u30fc\u30d0\u3068\u540c\u671f\u3059\u308b\u5834\u5408\u306b\u306f\u5fc5\u9808\u306e\u77e5\u8b58\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">NTP\u8a8d\u8a3c\u306e\u8a2d\u5b9a\u624b\u9806<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">NTP\u8a8d\u8a3c\u3092\u5c0e\u5165\u3059\u308b\u3068\u3001\u6b63\u3057\u3044\u30ad\u30fc\u3092\u6301\u3064\u76f8\u624b\u3068\u306e\u307fNTP\u901a\u4fe1\u3092\u8a31\u53ef\u3067\u304d\u307e\u3059\u3002\u8a2d\u5b9a\u306e\u6d41\u308c\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u8a8d\u8a3c\u6a5f\u80fd\u3092\u6709\u52b9\u5316<\/strong> <code>(config)# ntp authenticate<\/code><\/li>\n\n\n\n<li><strong>\u8a8d\u8a3c\u30ad\u30fc\u306e\u5b9a\u7fa9<\/strong> <code>(config)# ntp authentication-key number md5 value<\/code><ul><li><code>number<\/code>\uff1a\u30ad\u30fc\u756a\u53f7<\/li><li><code>value<\/code>\uff1a\u4efb\u610f\u306e\u6587\u5b57\u5217<\/li><\/ul>\u4f8b\uff1a <code>(config)# ntp authentication-key 1 md5 Cisco123<\/code><\/li>\n\n\n\n<li><strong>\u4fe1\u983c\u3059\u308b\u30ad\u30fc\u3092\u6307\u5b9a<\/strong> <code>(config)# ntp trusted-key key-number<\/code><\/li>\n\n\n\n<li><strong>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u5074\u3067\u30b5\u30fc\u30d0\u6307\u5b9a\u6642\u306b\u30ad\u30fc\u3092\u4f7f\u7528<\/strong> <code>(config)# ntp server ip-address key key-number<\/code><\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u2192 \u3053\u306e4\u30b9\u30c6\u30c3\u30d7\u3067\u3001NTP\u30b5\u30fc\u30d0\u3068\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u9593\u306e\u8a8d\u8a3c\u4ed8\u304d\u540c\u671f\u304c\u5b9f\u73fe\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">NTP\u30a2\u30af\u30bb\u30b9\u5236\u5fa1\uff08ACL\uff09<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ACL\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u3069\u306e\u6a5f\u5668\u304cNTP\u30b5\u30fc\u30d3\u30b9\u3092\u5229\u7528\u3067\u304d\u308b\u304b\u3092\u5236\u5fa1\u53ef\u80fd\u3067\u3059\u3002\u7279\u306b\u5916\u90e8\u30b5\u30fc\u30d0\u3068\u901a\u4fe1\u3059\u308b\u5834\u5408\u306b\u306f\u6709\u52b9\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# ntp access-group &#91; query-only | serve-only | serve | peer ] acl-number<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>query-only<\/strong>\uff1a\u5236\u5fa1\u30af\u30a8\u30ea\u306e\u307f\u8a31\u53ef<\/li>\n\n\n\n<li><strong>serve-only<\/strong>\uff1a\u6642\u523b\u8981\u6c42\u306e\u307f\u8a31\u53ef<\/li>\n\n\n\n<li><strong>serve<\/strong>\uff1a\u6642\u523b\u8981\u6c42\u3068\u5236\u5fa1\u30af\u30a8\u30ea\u306f\u8a31\u53ef\u3059\u308b\u304c\u3001\u540c\u671f\u5316\u306f\u4e0d\u53ef<\/li>\n\n\n\n<li><strong>peer<\/strong>\uff1a\u5168\u3066\u8a31\u53ef\uff08\u3082\u3063\u3068\u3082\u5e83\u3044\u6a29\u9650\uff09<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3088\u304f\u4f7f\u308f\u308c\u308b\u306e\u306f <strong>serve-only<\/strong> \u3068 <strong>peer<\/strong> \u3067\u3059\u3002<br>\u4f8b\u3048\u3070\u300c\u793e\u5185LAN\u304b\u3089\u306e\u6642\u523b\u8981\u6c42\u306f\u8a31\u53ef\u3059\u308b\u304c\u3001\u5916\u90e8\u304b\u3089\u306e\u540c\u671f\u8981\u6c42\u306f\u62d2\u5426\u3059\u308b\u300d\u3068\u3044\u3063\u305f\u5236\u5fa1\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u7279\u5b9a\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u306eNTP\u30b5\u30fc\u30d3\u30b9\u7121\u52b9\u5316<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u3001\u3059\u3079\u3066\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067NTP\u304c\u6709\u52b9\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u4e0d\u8981\u306a\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067NTP\u3092\u6b62\u3081\u308b\u5834\u5408\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# interface GigabitEthernet0\/1\n(config-if)# ntp disable<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u30a2\u30bd\u30b7\u30a8\u30fc\u30b7\u30e7\u30f3\u306e\u6700\u5927\u6570\u5236\u9650<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u63a5\u7d9a\u3067\u304d\u308bNTP\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3084\u30d4\u30a2\u306e\u6570\u3092\u5236\u9650\u3059\u308b\u3053\u3068\u3067\u3001\u4e0d\u6b63\u5229\u7528\u3084\u30ea\u30bd\u30fc\u30b9\u306e\u6d6a\u8cbb\u3092\u9632\u3052\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# ntp max-associations number<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">NTP\u30d0\u30fc\u30b8\u30e7\u30f3<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>NTPv3<\/strong>\uff08\u30c7\u30d5\u30a9\u30eb\u30c8\uff09\n<ul class=\"wp-block-list\">\n<li>IPv4\u5bfe\u5fdc<\/li>\n\n\n\n<li>\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u3092\u5229\u7528<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>NTPv4<\/strong>\uff08\u6700\u65b0IOS\u3067\u5229\u7528\u53ef\u80fd\uff09\n<ul class=\"wp-block-list\">\n<li>IPv4\u3068IPv6\u3092\u30b5\u30dd\u30fc\u30c8<\/li>\n\n\n\n<li>\u516c\u958b\u9375\u6697\u53f7\u5316\u3084X.509\u8a8d\u8a3c\u306b\u57fa\u3065\u304f\u5f37\u5316\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3<\/li>\n\n\n\n<li>\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8\u5bfe\u5fdc<\/li>\n\n\n\n<li>NTPv3\u3068\u306e\u4e0b\u4f4d\u4e92\u63db\u3042\u308a<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u6307\u5b9a\u3059\u308b\u5834\u5408\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# ntp server 192.168.1.254 version 4<\/code><\/pre>\n\n\n\n<p class=\"is-style-icon_pen wp-block-paragraph\">\u8a66\u9a13\u5bfe\u7b56\uff1a\u300c\u8a8d\u8a3c\uff1dntp authenticate \u2192 authentication-key \u2192 trusted-key \u2192 server key \u306e\u6d41\u308c\u300d\u300c\u30a2\u30af\u30bb\u30b9\u5236\u5fa1\u306f access-group\u300d\u300cNTPv3\u306f\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u3001NTPv4\u306f\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8\uff0bIPv6\u5bfe\u5fdc\u300d\u3068\u3044\u3046\u89b3\u70b9\u3067\u554f\u308f\u308c\u3084\u3059\u3044\u305f\u3081\u3001\u6574\u7406\u3057\u3066\u899a\u3048\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u25c6\u307e\u3068\u3081\u30b9\u30e9\u30a4\u30c9<\/h2>\n\n\n\n<div data-wp-interactive=\"core\/file\" class=\"wp-block-file\"><object data-wp-bind--hidden=\"!state.hasPdfPreview\" hidden class=\"wp-block-file__embed\" data=\"https:\/\/ccna-curriculum.tech-village.co.jp\/wp-content\/uploads\/2025\/05\/NTP.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"NTP\u306e\u57cb\u3081\u8fbc\u307f\u3002\"><\/object><a id=\"wp-block-file--media-d64b0440-02b3-40fc-93f6-909ebf0c3798\" href=\"https:\/\/ccna-curriculum.tech-village.co.jp\/wp-content\/uploads\/2025\/05\/NTP.pdf\">NTP<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>NTP\u3068\u306f NTP\uff08Network Time Protocol\uff09\u306f\u3001\u30d1\u30bd\u30b3\u30f3\u3084\u30b9\u30de\u30db\u3001\u30eb\u30fc\u30bf\u306a\u3069\u306e\u6642\u8a08\u3092\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7d4c\u7531\u3067\u6b63\u3057\u304f\u305d\u308d\u3048\u308b\u305f\u3081\u306e\u4ed5\u7d44\u307f\u3067\u3059\u3002\u3053\u308c\u3092\u4f7f\u3046\u3068\u6b21\u306e\u3088\u3046\u306a\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002 NTP\u306e\u30d1\u30b1\u30c3\u30c8 NT [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":"","footnotes":""},"categories":[14],"tags":[],"class_list":["post-171","post","type-post","status-publish","format-standard","hentry","category-ip-service"],"_links":{"self":[{"href":"https:\/\/ccna-curriculum.tech-village.co.jp\/index.php?rest_route=\/wp\/v2\/posts\/171","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ccna-curriculum.tech-village.co.jp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ccna-curriculum.tech-village.co.jp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ccna-curriculum.tech-village.co.jp\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ccna-curriculum.tech-village.co.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=171"}],"version-history":[{"count":3,"href":"https:\/\/ccna-curriculum.tech-village.co.jp\/index.php?rest_route=\/wp\/v2\/posts\/171\/revisions"}],"predecessor-version":[{"id":750,"href":"https:\/\/ccna-curriculum.tech-village.co.jp\/index.php?rest_route=\/wp\/v2\/posts\/171\/revisions\/750"}],"wp:attachment":[{"href":"https:\/\/ccna-curriculum.tech-village.co.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=171"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ccna-curriculum.tech-village.co.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=171"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ccna-curriculum.tech-village.co.jp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=171"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}