{"id":231,"date":"2025-04-12T18:01:00","date_gmt":"2025-04-12T09:01:00","guid":{"rendered":"https:\/\/ccna-curriculum.tech-village.co.jp\/?p=231"},"modified":"2025-10-12T13:13:34","modified_gmt":"2025-10-12T04:13:34","slug":"ospf%ef%bc%88%e6%a7%8b%e6%88%90%e8%a6%81%e7%b4%a0%ef%bc%89","status":"publish","type":"post","link":"https:\/\/ccna-curriculum.tech-village.co.jp\/?p=231","title":{"rendered":"OSPF\uff08\u69cb\u6210\u8981\u7d20\uff09"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">OSPF &#8211; \u30a8\u30ea\u30a2\u3068\u306f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">OSPF\u306b\u304a\u3051\u308b\u300c\u30a8\u30ea\u30a2\u300d\u3068\u306f\u3001LSA\u3092\u3084\u308a\u53d6\u308a\u3059\u308b\u7bc4\u56f2\u3092\u9650\u5b9a\u3059\u308b\u305f\u3081\u306e\u8ad6\u7406\u7684\u306a\u30b0\u30eb\u30fc\u30d7\u3092\u6307\u3057\u307e\u3059\u3002\u8a00\u3044\u63db\u3048\u308b\u3068\u3001\u300c\u540c\u3058LSDB\u3092\u5171\u6709\u3059\u308b\u30eb\u30fc\u30bf\u306e\u307e\u3068\u307e\u308a\u300d\u3068\u8003\u3048\u308b\u3068\u5206\u304b\u308a\u3084\u3059\u3044\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30a8\u30ea\u30a2\u3092\u4f7f\u308f\u305a\u306b\u3059\u3079\u3066\u306e\u30eb\u30fc\u30bf\u304c\u540c\u3058LSA\u3092\u6301\u3063\u3066\u3057\u307e\u3046\u3068\u3001\u30eb\u30fc\u30bf\u306f\u5927\u91cf\u306e\u60c5\u5831\u3092\u4fdd\u6301\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u3001\u30e1\u30e2\u30ea\u3084CPU\u306b\u5927\u304d\u306a\u8ca0\u8377\u304c\u304b\u304b\u308a\u307e\u3059\u3002\u305d\u3053\u3067\u30a8\u30ea\u30a2\u3092\u5206\u5272\u3057\u3001\u7570\u306a\u308b\u30a8\u30ea\u30a2\u306b\u306f\u5fc5\u8981\u6700\u5c0f\u9650\u306e\u96c6\u7d04\u60c5\u5831\u3060\u3051\u3092\u901a\u77e5\u3059\u308b\u3053\u3068\u3067\u3001LSA\u306e\u30d5\u30e9\u30c3\u30c7\u30a3\u30f3\u30b0\u3092\u5c40\u6240\u5316\u3067\u304d\u308b\u4ed5\u7d44\u307f\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u30a8\u30ea\u30a2\u306e\u5b9a\u7fa9\u306f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7ba1\u7406\u8005\u304c\u624b\u52d5\u3067\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30a8\u30ea\u30a2\u5206\u5272\u306b\u3088\u308b\u30e1\u30ea\u30c3\u30c8<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30a8\u30ea\u30a2\u5206\u5272\u306f\u5927\u898f\u6a21\u306aOSPF\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u304a\u3044\u3066\u975e\u5e38\u306b\u6709\u52b9\u3067\u3059\u3002\u4e3b\u306a\u5229\u70b9\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u30e1\u30ea\u30c3\u30c8<\/th><th>\u8aac\u660e<\/th><\/tr><\/thead><tbody><tr><td>LSDB\u30b5\u30a4\u30ba\u306e\u7e2e\u5c0f<\/td><td>\u540c\u3058\u30a8\u30ea\u30a2\u5185\u306e\u30eb\u30fc\u30bf\u306f\u540c\u3058LSDB\u3092\u6301\u3061\u307e\u3059\u304c\u3001\u30a8\u30ea\u30a2\u3092\u5206\u5272\u3059\u308b\u3068\u4ed6\u306e\u30a8\u30ea\u30a2\u306e\u8a73\u7d30\u60c5\u5831\u3092\u4fdd\u6301\u3057\u306a\u304f\u3066\u3088\u304f\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u7d50\u679c\u3001\u5404\u30eb\u30fc\u30bf\u306e\u30e1\u30e2\u30ea\u8ca0\u8377\u304c\u8efd\u6e1b\u3055\u308c\u307e\u3059\u3002<\/td><\/tr><tr><td>SPF\u8a08\u7b97\u983b\u5ea6\u306e\u6e1b\u5c11<\/td><td>\u30c8\u30dd\u30ed\u30b8\u306e\u5909\u5316\u306f\u540c\u3058\u30a8\u30ea\u30a2\u5185\u306b\u9650\u5b9a\u3055\u308c\u308b\u305f\u3081\u3001SPF\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u518d\u8a08\u7b97\u304c\u6291\u3048\u3089\u308c\u3001CPU\u4f7f\u7528\u7387\u304c\u6e1b\u5c11\u3057\u307e\u3059\u3002<\/td><\/tr><tr><td>\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u30c6\u30fc\u30d6\u30eb\u306e\u7e2e\u5c0f<\/td><td>\u7570\u306a\u308b\u30a8\u30ea\u30a2\u3078\u306f\u7d4c\u8def\u3092\u96c6\u7d04\u3057\u3066\u901a\u77e5\u3067\u304d\u308b\u305f\u3081\u3001\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u30c6\u30fc\u30d6\u30eb\u306e\u30b5\u30a4\u30ba\u3092\u5c0f\u3055\u304f\u4fdd\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"is-style-icon_pen wp-block-paragraph\">\u8a66\u9a13\u5bfe\u7b56\uff1a\u300c\u30a8\u30ea\u30a2\u5206\u5272\u306b\u3088\u308a\u30eb\u30fc\u30bf\u306e\u8ca0\u8377\u304c\u8efd\u6e1b\u3055\u308c\u308b\u300d\u3068\u3044\u3046\u70b9\u304c\u3088\u304f\u554f\u308f\u308c\u307e\u3059\u306e\u3067\u5fc5\u305a\u62bc\u3055\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">OSPF &#8211; \u30b7\u30f3\u30b0\u30eb\u30a8\u30ea\u30a2\u3068\u30de\u30eb\u30c1\u30a8\u30ea\u30a2<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">OSPF\u306f\u300c\u81ea\u5f8b\u30b7\u30b9\u30c6\u30e0\uff08AS\uff09\u300d\u3068\u300c\u30a8\u30ea\u30a2\u300d\u3067\u69cb\u6210\u3055\u308c\u307e\u3059\u3002\u3053\u3053\u3067\u306eAS\u3068\u306f\u3001\u540c\u3058\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u4f7f\u3063\u3066\u7d4c\u8def\u60c5\u5831\u3092\u3084\u308a\u53d6\u308a\u3059\u308b\u30eb\u30fc\u30bf\u306e\u96c6\u5408\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">OSPF\u306e\u30a8\u30ea\u30a2\u8a2d\u8a08\u3067\u306f\u3001\u5fc5\u305a\u4e2d\u5fc3\u306b\u300c\u30a8\u30ea\u30a20\uff08\u30d0\u30c3\u30af\u30dc\u30fc\u30f3\u30a8\u30ea\u30a2\uff09\u300d\u304c\u5b58\u5728\u3057\u3001\u3059\u3079\u3066\u306e\u4ed6\u306e\u30a8\u30ea\u30a2\u306f\u30a8\u30ea\u30a20\u306b\u63a5\u7d9a\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u3064\u307e\u308a\u3001\u30a8\u30ea\u30a20\u3092\u8ef8\u306b\u3057\u305f2\u968e\u5c64\u69cb\u9020\u306b\u306a\u308b\u306e\u304cOSPF\u306e\u7279\u5fb4\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c0f\u898f\u6a21\u306a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u3042\u308c\u3070\u30a8\u30ea\u30a20\u3060\u3051\u3092\u4f7f\u3046\u300c\u30b7\u30f3\u30b0\u30eb\u30a8\u30ea\u30a2\u300d\u69cb\u6210\u3067\u3082\u554f\u984c\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001\u5927\u898f\u6a21\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u306f\u30eb\u30fc\u30bf\u306e\u8ca0\u8377\u3092\u8efd\u6e1b\u3059\u308b\u305f\u3081\u306b\u8907\u6570\u306e\u30a8\u30ea\u30a2\u3092\u5229\u7528\u3059\u308b\u300c\u30de\u30eb\u30c1\u30a8\u30ea\u30a2\u300d\u69cb\u6210\u304c\u63a8\u5968\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u306a\u304a\u3001\u30a8\u30ea\u30a2\u306e\u5883\u754c\u306f\u30eb\u30fc\u30bf\u306b\u3088\u3063\u3066\u5b9a\u7fa9\u3055\u308c\u307e\u3059\u3002\u30eb\u30fc\u30bf\u306e\u5404\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3054\u3068\u306b\u3069\u306e\u30a8\u30ea\u30a2\u306b\u5c5e\u3059\u308b\u304b\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-icon_pen wp-block-paragraph\">\u8a66\u9a13\u5bfe\u7b56\uff1a\u300c\u3059\u3079\u3066\u306e\u30a8\u30ea\u30a2\u306f\u5fc5\u305a\u30a8\u30ea\u30a20\u3068\u96a3\u63a5\u3059\u308b\u300d\u3068\u3044\u3046\u30eb\u30fc\u30eb\u304c\u983b\u51fa\u3067\u3059\u306e\u3067\u3001\u5fc5\u305a\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">OSPF &#8211; OSPF\u30eb\u30fc\u30bf\u306e\u30bf\u30a4\u30d7<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u30de\u30eb\u30c1\u30a8\u30ea\u30a2\u69cb\u6210\u3092\u7d44\u3080\u3068\u3001OSPF\u30eb\u30fc\u30bf\u306b\u306f\u5f79\u5272\u306b\u5fdc\u3058\u3066\u6b21\u306e4\u7a2e\u985e\u306e\u30bf\u30a4\u30d7\u304c\u3042\u308a\u307e\u3059\u30021\u53f0\u306e\u30eb\u30fc\u30bf\u304c\u8907\u6570\u306e\u5f79\u5272\u3092\u6301\u3064\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u30eb\u30fc\u30bf\u306e\u30bf\u30a4\u30d7<\/th><th>\u8aac\u660e<\/th><\/tr><\/thead><tbody><tr><td>\u5185\u90e8\u30eb\u30fc\u30bf<\/td><td>\u3059\u3079\u3066\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304c\u540c\u3058\u30a8\u30ea\u30a2\u306b\u63a5\u7d9a\u3055\u308c\u3066\u3044\u308b\u30eb\u30fc\u30bf\u3002<\/td><\/tr><tr><td>\u30d0\u30c3\u30af\u30dc\u30fc\u30f3\u30eb\u30fc\u30bf<\/td><td>\u5c11\u306a\u304f\u3068\u30821\u3064\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304c\u30a8\u30ea\u30a20\u306b\u63a5\u7d9a\u3055\u308c\u3066\u3044\u308b\u30eb\u30fc\u30bf\u3002<\/td><\/tr><tr><td>ABR\uff08\u30a8\u30ea\u30a2\u5883\u754c\u30eb\u30fc\u30bf\uff09<\/td><td>\u8907\u6570\u306e\u30a8\u30ea\u30a2\u306b\u5c5e\u3059\u308b\u30eb\u30fc\u30bf\u3067\u3001\u30a8\u30ea\u30a2\u9593\u306e\u7d4c\u8def\u96c6\u7d04\u3084\u60c5\u5831\u4ea4\u63db\u3092\u62c5\u5f53\u3002ABR\u306f\u30a8\u30ea\u30a2\u3054\u3068\u306eLSDB\u3092\u4fdd\u6301\u3057\u307e\u3059\u3002<\/td><\/tr><tr><td>ASBR\uff08AS\u5883\u754c\u30eb\u30fc\u30bf\uff09<\/td><td>\u5916\u90e8\u306eAS\uff08\u4f8b\uff1aRIP\u3084EIGRP\u306a\u3069\u306e\u4ed6\u30d7\u30ed\u30c8\u30b3\u30eb\uff09\u3068\u63a5\u7d9a\u3059\u308b\u30eb\u30fc\u30bf\u3002\u5916\u90e8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u7d4c\u8def\u3092OSPF\u3078\u518d\u914d\u5e03\u3057\u3001\u7570\u306a\u308b\u30d7\u30ed\u30c8\u30b3\u30eb\u9593\u306e\u901a\u4fe1\u3092\u53ef\u80fd\u306b\u3057\u307e\u3059\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">\u5b9f\u969b\u306e\u30a8\u30ea\u30a2\u8a2d\u8a08\u4f8b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b9f\u969b\u306e\u4f01\u696d\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8a2d\u8a08\u3067\u306f\u3001WAN\u90e8\u5206\u3092\u30a8\u30ea\u30a20\uff08\u30d0\u30c3\u30af\u30dc\u30fc\u30f3\u30a8\u30ea\u30a2\uff09\u306b\u8a2d\u5b9a\u3057\u3001\u5404\u62e0\u70b9\u3092\u30a8\u30ea\u30a21\u3001\u30a8\u30ea\u30a22\u3068\u3044\u3063\u305f\u5f62\u3067\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u304c\u4e00\u822c\u7684\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u3059\u3079\u3066\u306e\u62e0\u70b9\u306f\u5fc5\u305a\u30a8\u30ea\u30a20\u3092\u7d4c\u7531\u3057\u3066\u76f8\u4e92\u306b\u901a\u4fe1\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3055\u3089\u306b\u3001\u5404\u62e0\u70b9\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30bb\u30b0\u30e1\u30f3\u30c8\u3092\/24\u3067\u8a2d\u8a08\u3057\u3001ABR\u4e0a\u3067\/16\u306b\u7d4c\u8def\u96c6\u7d04\u3057\u3066\u4ed6\u306e\u30a8\u30ea\u30a2\u306b\u901a\u77e5\u3059\u308b\u65b9\u6cd5\u304c\u3088\u304f\u4f7f\u308f\u308c\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u4ed6\u306e\u30a8\u30ea\u30a2\u306e\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u30c6\u30fc\u30d6\u30eb\u3092\u30b7\u30f3\u30d7\u30eb\u306b\u4fdd\u3061\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5168\u4f53\u306e\u52b9\u7387\u3092\u9ad8\u3081\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-icon_pen wp-block-paragraph\">\u8a66\u9a13\u5bfe\u7b56\uff1a\u300cABR\u3067\u7d4c\u8def\u96c6\u7d04\u3067\u304d\u308b\u300d\u300cASBR\u306f\u5916\u90e8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3068\u306e\u5883\u754c\u30eb\u30fc\u30bf\u300d\u3068\u3044\u3063\u305f\u77e5\u8b58\u304c\u554f\u308f\u308c\u3084\u3059\u3044\u306e\u3067\u3001\u78ba\u5b9f\u306b\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">OSPF &#8211; \u30d1\u30b1\u30c3\u30c8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">OSPF\u306e\u30d1\u30b1\u30c3\u30c8\u306f\u3001IP\u30d1\u30b1\u30c3\u30c8\u306e\u4e2d\u3067\u30d7\u30ed\u30c8\u30b3\u30eb\u756a\u53f789\u3092\u4f7f\u3063\u3066\u76f4\u63a5\u30ab\u30d7\u30bb\u30eb\u5316\u3055\u308c\u307e\u3059\u3002TCP\u3084UDP\u3068\u3044\u3063\u305f\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u5c64\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u5229\u7528\u3057\u307e\u305b\u3093\u304c\u3001\u78ba\u8a8d\u5fdc\u7b54\uff08Ack\uff09\u3092\u53d6\u308a\u5165\u308c\u308b\u3053\u3068\u3067\u4fe1\u983c\u6027\u3092\u78ba\u4fdd\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">OSPF\u30d1\u30b1\u30c3\u30c8\u306e\u30d8\u30c3\u30c0\u306b\u306f\u4ee5\u4e0b\u306e\u60c5\u5831\u304c\u542b\u307e\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>OSPF\u30d8\u30c3\u30c0<\/th><th>\u8aac\u660e<\/th><\/tr><\/thead><tbody><tr><td>\u30d0\u30fc\u30b8\u30e7\u30f3<\/td><td>\u4f7f\u7528\u3057\u3066\u3044\u308bOSPF\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u756a\u53f7\u3002IPv4\u306a\u3089\u300c2\u300d\u3001IPv6\u306a\u3089\u300c3\u300d\u3002<\/td><\/tr><tr><td>\u30bf\u30a4\u30d7<\/td><td>OSPF\u30d1\u30b1\u30c3\u30c8\u306e\u7a2e\u985e\uff081\uff5e5\uff09\u3002\u305f\u3068\u3048\u3070Hello\u30d1\u30b1\u30c3\u30c8\u306f\u300c1\u300d\u3002<\/td><\/tr><tr><td>\u30d1\u30b1\u30c3\u30c8\u9577<\/td><td>\u30d8\u30c3\u30c0\u3092\u542b\u3081\u305f\u30d1\u30b1\u30c3\u30c8\u5168\u4f53\u306e\u9577\u3055\u3002<\/td><\/tr><tr><td>\u30eb\u30fc\u30bfID<\/td><td>\u30eb\u30fc\u30bf\u3092\u4e00\u610f\u306b\u8b58\u5225\u3059\u308b32\u30d3\u30c3\u30c8\u306e\u5024\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u6709\u52b9\u306a\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u4e2d\u3067\u6700\u3082\u5927\u304d\u306aIP\u304c\u9078\u3070\u308c\u308b\u3002<\/td><\/tr><tr><td>\u30a8\u30ea\u30a2ID<\/td><td>\u30d1\u30b1\u30c3\u30c8\u3092\u9001\u51fa\u3059\u308b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304c\u5c5e\u3057\u3066\u3044\u308b\u30a8\u30ea\u30a2\u3092\u793a\u3059\u300232\u30d3\u30c3\u30c8\u306e\u5024\u3002<\/td><\/tr><tr><td>\u30c1\u30a7\u30c3\u30af\u30b5\u30e0<\/td><td>\u30c7\u30fc\u30bf\u306e\u7834\u640d\u3092\u691c\u51fa\u3059\u308b\u305f\u3081\u306e\u30c1\u30a7\u30c3\u30af\u30b5\u30e0\u3002<\/td><\/tr><tr><td>\u8a8d\u8a3c\u30bf\u30a4\u30d7<\/td><td>0\u306a\u3089\u8a8d\u8a3c\u306a\u3057\u30011\u306a\u3089\u5e73\u6587\u8a8d\u8a3c\u30012\u306a\u3089MD5\u8a8d\u8a3c\u3002<\/td><\/tr><tr><td>\u8a8d\u8a3c<\/td><td>\u8a8d\u8a3c\u30bf\u30a4\u30d7\u306b\u5fdc\u3058\u305f\u60c5\u5831\u304c\u683c\u7d0d\u3055\u308c\u308b\u3002MD5\u8a8d\u8a3c\u3067\u306fKey ID\u3082\u542b\u307e\u308c\u308b\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">OSPF &#8211; 5\u7a2e\u985e\u306e\u30d1\u30b1\u30c3\u30c8<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">OSPF\u3067\u306f\u3001\u96a3\u63a5\u30eb\u30fc\u30bf\u3068\u4ee5\u4e0b\u306e5\u7a2e\u985e\u306e\u30d1\u30b1\u30c3\u30c8\u3092\u3084\u308a\u53d6\u308a\u3057\u3066\u3001\u30cd\u30a4\u30d0\u30fc\u95a2\u4fc2\u3092\u78ba\u7acb\u3057\u3001\u30cd\u30a4\u30d0\u30fc\u30c6\u30fc\u30d6\u30eb\u3084LSDB\u3092\u6700\u65b0\u306e\u72b6\u614b\u306b\u4fdd\u3061\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u30bf\u30a4\u30d7<\/th><th>\u30d1\u30b1\u30c3\u30c8\u540d<\/th><th>\u8aac\u660e<\/th><\/tr><\/thead><tbody><tr><td>1<\/td><td>Hello<\/td><td>\u30cd\u30a4\u30d0\u30fc\u3092\u691c\u51fa\u3059\u308b\u305f\u3081\u306e\u30d1\u30b1\u30c3\u30c8\u3002\u78ba\u7acb\u5f8c\u306f\u30ad\u30fc\u30d7\u30a2\u30e9\u30a4\u30d6\u3068\u3057\u3066\u3082\u4f7f\u7528\u3055\u308c\u308b\u3002\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8224.0.0.5\u5b9b\u306b\u9001\u4fe1\u3055\u308c\u308b\u3002<\/td><\/tr><tr><td>2<\/td><td>DBD<\/td><td>Database Description\u30d1\u30b1\u30c3\u30c8\u3002\u81ea\u8eab\u306eLSDB\u306b\u542b\u307e\u308c\u308bLSA\u4e00\u89a7\u3092\u9001\u4fe1\u3059\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u4e0d\u8db3\u3057\u3066\u3044\u308b\u60c5\u5831\u3092\u78ba\u8a8d\u3067\u304d\u308b\u3002<\/td><\/tr><tr><td>3<\/td><td>LSR<\/td><td>Link State Request\u30d1\u30b1\u30c3\u30c8\u3002\u4e0d\u8db3\u3057\u3066\u3044\u308b\u7279\u5b9a\u306eLSA\u3092\u30cd\u30a4\u30d0\u30fc\u306b\u8981\u6c42\u3059\u308b\u3002<\/td><\/tr><tr><td>4<\/td><td>LSU<\/td><td>Link State Update\u30d1\u30b1\u30c3\u30c8\u3002LSR\u306b\u5bfe\u3059\u308b\u5fdc\u7b54\u3068\u3057\u3066\u3001\u8981\u6c42\u3055\u308c\u305fLSA\u3092\u9001\u4fe1\u3059\u308b\u3002<\/td><\/tr><tr><td>5<\/td><td>LSAck<\/td><td>Link State Acknowledgement\u30d1\u30b1\u30c3\u30c8\u3002LSU\u3092\u6b63\u3057\u304f\u53d7\u4fe1\u3057\u305f\u3053\u3068\u3092\u901a\u77e5\u3059\u308b\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"is-style-icon_pen wp-block-paragraph\">\u8a66\u9a13\u5bfe\u7b56\uff1a\u300cOSPF\u306e\u30d1\u30b1\u30c3\u30c8\u30bf\u30a4\u30d7\u306f5\u7a2e\u985e\u300d\u300cHello\u306f\u30bf\u30a4\u30d71\u300d\u300cAck\u304cLSAck\u300d\u3068\u3044\u3063\u305f\u57fa\u672c\u77e5\u8b58\u304c\u3088\u304f\u554f\u308f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">OSPF &#8211; Hello\u30d1\u30b1\u30c3\u30c8\u306e\u8a73\u7d30<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">OSPF\u306eHello\u30d1\u30b1\u30c3\u30c8\u306f\u3001\u30cd\u30a4\u30d0\u30fc\u306e\u691c\u51fa\u3068\u7dad\u6301\u306b\u5229\u7528\u3055\u308c\u307e\u3059\u3002\u305d\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306b\u306f\u4ee5\u4e0b\u306e\u9805\u76ee\u304c\u542b\u307e\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>OSPF\u30c7\u30fc\u30bf<\/th><th>\u8aac\u660e<\/th><\/tr><\/thead><tbody><tr><td>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30de\u30b9\u30af<\/td><td>\u9001\u4fe1\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3002<\/td><\/tr><tr><td>Hello\u30a4\u30f3\u30bf\u30fc\u30d0\u30eb<\/td><td>Hello\u30d1\u30b1\u30c3\u30c8\u3092\u9001\u4fe1\u3059\u308b\u9593\u9694\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u306f10\u79d2\u307e\u305f\u306f30\u79d2\u3002<\/td><\/tr><tr><td>\u30aa\u30d7\u30b7\u30e7\u30f3<\/td><td>8\u30d3\u30c3\u30c8\u306e\u30d5\u30e9\u30b0\u5024\u3092\u6301\u3061\u3001\u30b9\u30bf\u30d6\u30a8\u30ea\u30a2\u306e\u8b58\u5225\u306a\u3069\u306b\u4f7f\u308f\u308c\u308b\u3002<\/td><\/tr><tr><td>\u30eb\u30fc\u30bf\u30d7\u30e9\u30a4\u30aa\u30ea\u30c6\u30a3<\/td><td>DR\/BDR\u9078\u51fa\u306e\u969b\u306b\u4f7f\u7528\u3002\u6700\u5927\u5024\u306f255\u30010\u306f\u9078\u51fa\u5bfe\u8c61\u5916\u3002<\/td><\/tr><tr><td>Dead\u30a4\u30f3\u30bf\u30fc\u30d0\u30eb<\/td><td>\u30cd\u30a4\u30d0\u30fc\u304c\u30c0\u30a6\u30f3\u3057\u305f\u3068\u307f\u306a\u3059\u6642\u9593\u3002\u5e38\u306bHello\u9593\u9694\u306e4\u500d\u3002<\/td><\/tr><tr><td>DR<\/td><td>\u6307\u5b9a\u30eb\u30fc\u30bf\uff08DR\uff09\u306eIP\u30a2\u30c9\u30ec\u30b9\u3002\u672a\u9078\u51fa\u306a\u30890.0.0.0\u3002<\/td><\/tr><tr><td>BDR<\/td><td>\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u6307\u5b9a\u30eb\u30fc\u30bf\uff08BDR\uff09\u306eIP\u30a2\u30c9\u30ec\u30b9\u3002\u672a\u9078\u51fa\u306a\u30890.0.0.0\u3002<\/td><\/tr><tr><td>\u30cd\u30a4\u30d0\u30fc<\/td><td>\u3059\u3067\u306b\u30cd\u30a4\u30d0\u30fc\u95a2\u4fc2\u3092\u78ba\u7acb\u3057\u3066\u3044\u308b\u30eb\u30fc\u30bfID\u306e\u4e00\u89a7\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">OSPF\u30cd\u30a4\u30d0\u30fc\u78ba\u7acb\u306b\u5fc5\u8981\u306a\u4e00\u81f4\u6761\u4ef6<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">OSPF\u30eb\u30fc\u30bf\u540c\u58eb\u304c\u30cd\u30a4\u30d0\u30fc\u95a2\u4fc2\u3092\u78ba\u7acb\u3059\u308b\u306b\u306f\u3001\u6b21\u306e7\u9805\u76ee\u304c\u5b8c\u5168\u306b\u4e00\u81f4\u3057\u3066\u3044\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30a8\u30ea\u30a2ID<\/li>\n\n\n\n<li>\u8a8d\u8a3c\u60c5\u5831\uff08\u6709\u52b9\u306a\u5834\u5408\uff09<\/li>\n\n\n\n<li>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30de\u30b9\u30af<\/li>\n\n\n\n<li>Hello\u30a4\u30f3\u30bf\u30fc\u30d0\u30eb<\/li>\n\n\n\n<li>Dead\u30a4\u30f3\u30bf\u30fc\u30d0\u30eb<\/li>\n\n\n\n<li>\u30b9\u30bf\u30d6\u30a8\u30ea\u30a2\u30d5\u30e9\u30b0\uff08\u30aa\u30d7\u30b7\u30e7\u30f3\u5024\uff09<\/li>\n\n\n\n<li>\u96a3\u63a5\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306eMTU\u30b5\u30a4\u30ba<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u6761\u4ef6\u306e\u3046\u30611\u3064\u3067\u3082\u4e0d\u4e00\u81f4\u304c\u3042\u308c\u3070\u3001Hello\u30d1\u30b1\u30c3\u30c8\u3092\u3084\u308a\u53d6\u308a\u3057\u3066\u3082\u30cd\u30a4\u30d0\u30fc\u95a2\u4fc2\u306f\u78ba\u7acb\u3067\u304d\u307e\u305b\u3093\u3002\u8a66\u9a13\u3067\u306f\u7279\u306b\u300c\u30cd\u30a4\u30d0\u30fc\u78ba\u7acb\u306b\u5fc5\u8981\u306a7\u6761\u4ef6\u300d\u304c\u3088\u304f\u51fa\u984c\u3055\u308c\u308b\u306e\u3067\u5fc5\u305a\u6697\u8a18\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">OSPF\u30cd\u30a4\u30d0\u30fc\u95a2\u4fc2\uff08Neighbor\uff09\u306e\u78ba\u7acb &#8211; 2Way State<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">OSPF\u30eb\u30fc\u30bf\u304c\u8d77\u52d5\u3057\u3066\u304b\u3089\u30cd\u30a4\u30d0\u30fc\u95a2\u4fc2\u3092\u7d50\u3076\u307e\u3067\u306b\u306f\u3001\u3044\u304f\u3064\u304b\u306e\u72b6\u614b\u9077\u79fb\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u30ea\u30f3\u30af\u30a2\u30c3\u30d7\u76f4\u5f8c\u304b\u3089\u306e\u6d41\u308c\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Step<\/th><th>State<\/th><th>\u8aac\u660e<\/th><\/tr><\/thead><tbody><tr><td>\u2460<\/td><td>Down State<\/td><td>OSPF\u304c\u672a\u7a3c\u50cd\u306e\u521d\u671f\u72b6\u614b\u3002\u30eb\u30fc\u30bf\u3092\u8d77\u52d5\u3059\u308b\u3068Hello\u30d1\u30b1\u30c3\u30c8\u306e\u9001\u4fe1\u3092\u958b\u59cb\u3059\u308b\u3002\u3053\u306eHello\u306f\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8\u30a2\u30c9\u30ec\u30b9224.0.0.5\u5b9b\u306b\u9001\u4fe1\u3055\u308c\u308b\u3002<\/td><\/tr><tr><td>\u2461<\/td><td>Init State<\/td><td>\u30cd\u30a4\u30d0\u30fc\u304b\u3089\u521d\u3081\u3066Hello\u30d1\u30b1\u30c3\u30c8\u3092\u53d7\u4fe1\u3057\u305f\u72b6\u614b\u3002\u3053\u306e\u6642\u70b9\u3067\u76f8\u624b\u3092\u300c\u5019\u88dc\u300d\u3068\u3057\u3066\u8a8d\u8b58\u3059\u308b\u3002<\/td><\/tr><tr><td>\u2462<\/td><td>2Way State<\/td><td>\u304a\u4e92\u3044\u306eHello\u30d1\u30b1\u30c3\u30c8\u3092\u53d7\u4fe1\u3057\u3001\u53cc\u65b9\u5411\u306b\u30cd\u30a4\u30d0\u30fc\u3092\u8a8d\u8b58\u3067\u304d\u305f\u72b6\u614b\u3002\u3053\u306e\u6bb5\u968e\u3067\u30cd\u30a4\u30d0\u30fc\u30c6\u30fc\u30d6\u30eb\u306b\u76f8\u624b\u304c\u767b\u9332\u3055\u308c\u308b\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e2Way State\u307e\u3067\u5230\u9054\u3059\u308b\u3068\u3001OSPF\u30eb\u30fc\u30bf\u306f\u4e92\u3044\u3092\u6b63\u3057\u304f\u96a3\u63a5\u30eb\u30fc\u30bf\u3068\u3057\u3066\u8a8d\u8b58\u3067\u304d\u305f\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30eb\u30fc\u30bfID\u306e\u6c7a\u5b9a\u65b9\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">OSPF\u30eb\u30fc\u30bf\u306b\u306f\u4e00\u610f\u306b\u8b58\u5225\u3059\u308b\u305f\u3081\u306e\u300c\u30eb\u30fc\u30bfID\u300d\u304c\u5fc5\u305a\u5fc5\u8981\u3067\u3059\u3002\u30eb\u30fc\u30bfID\u306f32\u30d3\u30c3\u30c8\u5024\u3067\u3001IPv4\u30a2\u30c9\u30ec\u30b9\u3068\u540c\u3058\u8868\u8a18\u5f62\u5f0f\u3092\u53d6\u308a\u307e\u3059\u3002\u91cd\u8907\u3059\u308b\u3068\u6b63\u3057\u304f\u52d5\u4f5c\u3057\u306a\u3044\u305f\u3081\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30eb\u30fc\u30bfID\u306f\u6b21\u306e\u512a\u5148\u9806\u4f4d\u3067\u6c7a\u5b9a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><code>router-id<\/code> \u30b3\u30de\u30f3\u30c9\u3067\u660e\u793a\u7684\u306b\u8a2d\u5b9a\u3055\u308c\u305f\u5024<\/li>\n\n\n\n<li>\u30eb\u30fc\u30d7\u30d0\u30c3\u30af\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u8a2d\u5b9a\u3055\u308c\u305f\u4e2d\u3067\u6700\u3082\u5927\u304d\u3044IP\u30a2\u30c9\u30ec\u30b9<\/li>\n\n\n\n<li>\u30a2\u30af\u30c6\u30a3\u30d6\u306a\u7269\u7406\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u8a2d\u5b9a\u3055\u308c\u305f\u4e2d\u3067\u6700\u3082\u5927\u304d\u3044IP\u30a2\u30c9\u30ec\u30b9<\/li>\n<\/ol>\n\n\n\n<p class=\"is-style-icon_pen wp-block-paragraph\">\u8a66\u9a13\u5bfe\u7b56\uff1a\u300c\u30eb\u30fc\u30bfID\u306f\u3069\u306e\u3088\u3046\u306b\u6c7a\u307e\u308b\u304b\u300d\u3068\u3044\u3046\u554f\u984c\u304c\u3088\u304f\u51fa\u984c\u3055\u308c\u308b\u306e\u3067\u3001\u3053\u306e\u512a\u5148\u9806\u4f4d\u306f\u5fc5\u305a\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">OSPF\u30a2\u30b8\u30e3\u30bb\u30f3\u30b7\u30fc\u95a2\u4fc2\uff08Adjacency\uff09\u306e\u78ba\u7acb &#8211; Full State<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">2Way State\u306b\u5230\u9054\u3057\u3001\u3055\u3089\u306bDR\/BDR\u306e\u9078\u51fa\u304c\u5b8c\u4e86\u3057\u305f\u30eb\u30fc\u30bf\u9593\u3067\u306f\u3001\u8a73\u7d30\u306a\u60c5\u5831\u4ea4\u63db\u304c\u59cb\u307e\u308a\u300c\u30a2\u30b8\u30e3\u30bb\u30f3\u30b7\u30fc\uff08Adjacency\uff09\u300d\u3068\u547c\u3070\u308c\u308b\u5f37\u3044\u95a2\u4fc2\u304c\u7d50\u3070\u308c\u307e\u3059\u3002\u3053\u306e\u95a2\u4fc2\u306b\u306a\u308b\u3068LSA\u304c\u4ea4\u63db\u3055\u308c\u3001LSDB\u306e\u5b8c\u5168\u306a\u540c\u671f\u304c\u884c\u308f\u308c\u307e\u3059\u3002\u6d41\u308c\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Step<\/th><th>State<\/th><th>\u8aac\u660e<\/th><\/tr><\/thead><tbody><tr><td>\u2463<\/td><td>Exstart State<\/td><td>LSA\u4ea4\u63db\u306e\u6e96\u5099\u6bb5\u968e\u3002\u3069\u3061\u3089\u306e\u30eb\u30fc\u30bf\u304c\u6700\u521d\u306b\u30c7\u30fc\u30bf\u3092\u9001\u308b\u304b\u3092\u6c7a\u3081\u308b\u3002\u30eb\u30fc\u30bfID\u306e\u5927\u304d\u3044\u65b9\u304c\u30de\u30b9\u30bf\u30fc\u3001\u5c0f\u3055\u3044\u65b9\u304c\u30b9\u30ec\u30fc\u30d6\u3068\u306a\u308b\u3002<\/td><\/tr><tr><td>\u2464<\/td><td>Exchange State<\/td><td>DBD\uff08Database Description\uff09\u30d1\u30b1\u30c3\u30c8\u306e\u4ea4\u63db\u3092\u884c\u3046\u3002\u3053\u308c\u306fLSDB\u306b\u767b\u9332\u3055\u308c\u3066\u3044\u308bLSA\u306e\u4e00\u89a7\u3067\u3042\u308b\u3002<\/td><\/tr><tr><td>\u2465<\/td><td>Loading State<\/td><td>\u53d7\u4fe1\u3057\u305fDBD\u3068\u81ea\u8eab\u306eLSDB\u3092\u6bd4\u8f03\u3057\u3001\u4e0d\u8db3\u3057\u3066\u3044\u308bLSA\u3092LSR\u3067\u8981\u6c42\u3059\u308b\u3002<\/td><\/tr><tr><td>\u2466<\/td><td>Full State<\/td><td>LSU\u3067\u4e0d\u8db3\u5206\u306eLSA\u304c\u9001\u3089\u308c\u3001\u3059\u3079\u3066\u306e\u60c5\u5831\u304c\u63c3\u3063\u305f\u72b6\u614b\u3002\u3053\u308c\u306b\u3088\u308a\u96a3\u63a5\u30eb\u30fc\u30bf\u3068\u5b8c\u5168\u306bLSDB\u3092\u540c\u671f\u3067\u304d\u308b\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Full State\u306b\u5230\u9054\u3059\u308b\u3068\u3001\u30eb\u30fc\u30bf\u9593\u3067\u300c\u5b8c\u5168\u306b\u540c\u3058\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u5730\u56f3\uff08LSDB\uff09\u300d\u3092\u5171\u6709\u3067\u304d\u3066\u3044\u308b\u3053\u3068\u306b\u306a\u308a\u3001\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u304c\u5b89\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">LSA\u306e\u7a2e\u985e<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">LSU\u30d1\u30b1\u30c3\u30c8\u306b\u542b\u307e\u308c\u308bLSA\u306b\u306f\u8907\u6570\u306e\u7a2e\u985e\u304c\u3042\u308a\u307e\u3059\u3002LSA\u306e\u30bf\u30a4\u30d7\u3054\u3068\u306b\u5f79\u5272\u3084\u30d5\u30e9\u30c3\u30c7\u30a3\u30f3\u30b0\u7bc4\u56f2\u304c\u7570\u306a\u308a\u307e\u3059\u3002OSPF\u4ed5\u69d8\u4e0a\u306f1\u301c11\u307e\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001Cisco\u3067\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b\u306e\u306f\u30bf\u30a4\u30d71\u301c5\u3068\u30bf\u30a4\u30d77\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-icon_pen wp-block-paragraph\">\u8a66\u9a13\u5bfe\u7b56\uff1a\u300cOSPF\u306eLSA\u30bf\u30a4\u30d7\u306f\u8907\u6570\u3042\u308b\u300d\u300cCisco\u3067\u306f1\u301c5\u30687\u3092\u30b5\u30dd\u30fc\u30c8\u300d\u3068\u3044\u3063\u305f\u77e5\u8b58\u304c\u51fa\u984c\u3055\u308c\u308b\u3053\u3068\u304c\u591a\u3044\u306e\u3067\u3001\u3053\u306e\u7bc4\u56f2\u3092\u62bc\u3055\u3048\u3066\u304a\u3051\u3070\u5341\u5206\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">OSPF &#8211; DR\u3068BDR<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">OSPF\u3067\u306f\u3001\u30a4\u30fc\u30b5\u30cd\u30c3\u30c8\u306e\u3088\u3046\u306a\u30de\u30eb\u30c1\u30a2\u30af\u30bb\u30b9\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u52b9\u7387\u3088\u304fLSA\u3092\u3084\u308a\u53d6\u308a\u3059\u308b\u305f\u3081\u306b\u300cDR\uff08Designated Router\uff1a\u6307\u5b9a\u30eb\u30fc\u30bf\uff09\u300d\u3068\u300cBDR\uff08Backup Designated Router\uff1a\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u6307\u5b9a\u30eb\u30fc\u30bf\uff09\u300d\u304c\u9078\u51fa\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3059\u3079\u3066\u306e\u30eb\u30fc\u30bf\u540c\u58eb\u3067\u76f4\u63a5LSA\u3092\u4ea4\u63db\u3059\u308b\u3068\u3001\u901a\u4fe1\u91cf\u304c\u6025\u5897\u3057\u3066\u7121\u99c4\u304c\u591a\u304f\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001DR\u3068BDR\u304c\u4ee3\u8868\u3068\u306a\u308a\u3001\u4ed6\u306e\u30eb\u30fc\u30bf\uff08DROTHER\u3068\u547c\u3070\u308c\u308b\uff09\u306fDR\u30fbBDR\u3068\u3060\u3051LSA\u3092\u3084\u308a\u53d6\u308a\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30cd\u30a4\u30d0\u30fc\u95a2\u4fc2\u306f\u5168\u30eb\u30fc\u30bf\u9593\u3067\u78ba\u7acb\u3055\u308c\u3064\u3064\u3082\u3001\u5b9f\u969b\u306eLSA\u4ea4\u63db\u306f\u5fc5\u8981\u6700\u5c0f\u9650\u306b\u6291\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">OSPF &#8211; DR\u3068BDR\u306e\u9078\u51fa<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">DR\u3068BDR\u306fHello\u30d1\u30b1\u30c3\u30c8\u306b\u542b\u307e\u308c\u308b\u300cOSPF\u30d7\u30e9\u30a4\u30aa\u30ea\u30c6\u30a3\u5024\u300d\u3092\u57fa\u6e96\u306b\u9078\u51fa\u3055\u308c\u307e\u3059\u3002\u30cd\u30a4\u30d0\u30fc\u95a2\u4fc2\u304c2Way State\u306b\u5230\u9054\u3057\u305f\u5f8c\u3001\u4ee5\u4e0b\u306e\u30eb\u30fc\u30eb\u3067\u9078\u51fa\u304c\u884c\u308f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u6700\u3082\u5927\u304d\u3044\u30d7\u30e9\u30a4\u30aa\u30ea\u30c6\u30a3\u5024\u3092\u6301\u3064\u30eb\u30fc\u30bf\u304cDR\u306b\u306a\u308b<\/li>\n\n\n\n<li>2\u756a\u76ee\u306b\u5927\u304d\u3044\u30d7\u30e9\u30a4\u30aa\u30ea\u30c6\u30a3\u5024\u3092\u6301\u3064\u30eb\u30fc\u30bf\u304cBDR\u306b\u306a\u308b<\/li>\n\n\n\n<li>\u30d7\u30e9\u30a4\u30aa\u30ea\u30c6\u30a3\u5024\u304c\u540c\u3058\u5834\u5408\u306f\u30eb\u30fc\u30bfID\u3092\u6bd4\u8f03\u3057\u3001\u5927\u304d\u3044\u65b9\u304cDR\u3001\u6b21\u70b9\u304cBDR\u306b\u306a\u308b<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u306a\u304a\u3001\u30d7\u30e9\u30a4\u30aa\u30ea\u30c6\u30a3\u5024\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u300c1\u300d\u306b\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3082\u3057\u5024\u3092\u300c0\u300d\u306b\u3059\u308b\u3068\u3001\u305d\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306f\u5fc5\u305aDROTHER\u3068\u306a\u308a\u3001DR\u3084BDR\u306b\u9078\u3070\u308c\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u91cd\u8981\u306a\u70b9\u3068\u3057\u3066\u3001DR\u3068BDR\u306f\u300c\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30bb\u30b0\u30e1\u30f3\u30c8\u3054\u3068\u306b\u300d\u9078\u51fa\u3055\u308c\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u540c\u3058\u30eb\u30fc\u30bf\u3067\u3082\u30bb\u30b0\u30e1\u30f3\u30c81\u3067\u306fDR\u3001\u30bb\u30b0\u30e1\u30f3\u30c82\u3067\u306fDROTHER\u3068\u3044\u3046\u3088\u3046\u306b\u5f79\u5272\u304c\u5909\u308f\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">OSPF &#8211; DR\u3068BDR\u306e\u52d5\u4f5c<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">DR\u3068BDR\u304c\u9078\u51fa\u3055\u308c\u308b\u3068\u3001LSA\u306e\u30d5\u30e9\u30c3\u30c7\u30a3\u30f3\u30b0\u306f\u6b21\u306e\u6d41\u308c\u3067\u884c\u308f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u9805\u756a<\/th><th>\u8aac\u660e<\/th><\/tr><\/thead><tbody><tr><td>\u2460<\/td><td>R1\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067192.168.1.0\/24\u304c\u30c0\u30a6\u30f3\u3057\u305f\u3053\u3068\u3092\u691c\u51fa\u3059\u308b\u3002<\/td><\/tr><tr><td>\u2461<\/td><td>R1\u306f\u66f4\u65b0\u3055\u308c\u305fLSA\u3092LSU\u306b\u8f09\u305b\u3066\u3001\u30bb\u30b0\u30e1\u30f3\u30c81\u306eDR\u30fbBDR\u3078\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8\uff08224.0.0.6\uff09\u3067\u9001\u4fe1\u3059\u308b\u3002<\/td><\/tr><tr><td>\u2462<\/td><td>DR\uff08R3\uff09\u306f\u53d7\u4fe1\u3057\u305fLSU\u3092\u3001\u30bb\u30b0\u30e1\u30f3\u30c81\u306e\u5168\u30eb\u30fc\u30bf\u306b\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8\uff08224.0.0.5\uff09\u3067\u518d\u914d\u5e03\u3059\u308b\u3002<\/td><\/tr><tr><td>\u2463<\/td><td>R3\u306f\u3055\u3089\u306b\u5225\u306e\u30bb\u30b0\u30e1\u30f3\u30c8\uff08\u4f8b\uff1a\u30bb\u30b0\u30e1\u30f3\u30c82\uff09\u306eDR\u30fbBDR\u306b\u5bfe\u3057\u3066\u3001224.0.0.6\u5b9b\u306b\u540c\u3058LSU\u3092\u9001\u4fe1\u3057\u3001\u30a8\u30ea\u30a2\u5168\u4f53\u306b\u4f1d\u64ad\u3055\u305b\u308b\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u6d41\u308c\u304c\u7e70\u308a\u8fd4\u3055\u308c\u3001\u6700\u7d42\u7684\u306b\u540c\u4e00\u30a8\u30ea\u30a2\u5185\u306e\u3059\u3079\u3066\u306e\u30eb\u30fc\u30bf\u306b\u66f4\u65b0\u304c\u4f1d\u308f\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u307e\u305f\u3001BDR\u306fDR\u306e\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u3068\u3057\u3066\u5f85\u6a5f\u3057\u3066\u3044\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001R4\u304cBDR\u3067\u3042\u308b\u5834\u5408\u3001R3\uff08DR\uff09\u304c\u30c0\u30a6\u30f3\u3057\u3066\u4e00\u5b9a\u6642\u9593\u5185\u306b\u5fdc\u7b54\u304c\u306a\u3051\u308c\u3070\u3001R4\u304c\u81ea\u52d5\u7684\u306bDR\u3078\u6607\u683c\u3057\u3001\u901a\u4fe1\u3092\u9014\u5207\u308c\u3055\u305b\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">OSPF &#8211; \u30cd\u30a4\u30d0\u30fc\u95a2\u4fc2\u3068\u30a2\u30b8\u30e3\u30bb\u30f3\u30b7\u30fc\u95a2\u4fc2\uff08\u7528\u8a9e\u306e\u6574\u7406\uff09<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">OSPF\u3067\u306f\u300c\u30cd\u30a4\u30d0\u30fc\u300d\u3084\u300c\u30a2\u30b8\u30e3\u30bb\u30f3\u30b7\u30fc\u300d\u3068\u3044\u3063\u305f\u7528\u8a9e\u304c\u767b\u5834\u3057\u3001\u6df7\u4e71\u3057\u3084\u3059\u3044\u90e8\u5206\u3067\u3059\u3002\u6574\u7406\u3059\u308b\u3068\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>OSPF\u30eb\u30fc\u30bf\u9593\u306e\u95a2\u4fc2<\/th><th>\u30b9\u30c6\u30fc\u30bf\u30b9<\/th><th>\u8aac\u660e<\/th><\/tr><\/thead><tbody><tr><td>Neighbor\uff08\u30cd\u30a4\u30d0\u30fc\uff09<\/td><td>2Way<\/td><td>\u4e92\u3044\u306bHello\u30d1\u30b1\u30c3\u30c8\u3092\u4ea4\u63db\u3057\u3066\u5b58\u5728\u3092\u78ba\u8a8d\u3067\u304d\u3066\u3044\u308b\u95a2\u4fc2\u3002<\/td><\/tr><tr><td>Adjacency\uff08\u30a2\u30b8\u30e3\u30bb\u30f3\u30b7\u30fc\uff09<\/td><td>Full<\/td><td>LSA\u3092\u4ea4\u63db\u3057\u3001LSDB\u3092\u5b8c\u5168\u306b\u540c\u671f\u3057\u3066\u3044\u308b\u95a2\u4fc2\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u3064\u307e\u308a\u3001\u3059\u3079\u3066\u306e\u30eb\u30fc\u30bf\u540c\u58eb\u304c\u30cd\u30a4\u30d0\u30fc\u95a2\u4fc2\u306b\u306a\u308a\u307e\u3059\u304c\u3001\u5b9f\u969b\u306b\u30a2\u30b8\u30e3\u30bb\u30f3\u30b7\u30fc\u3092\u7d50\u3093\u3067LSA\u3092\u4ea4\u63db\u3059\u308b\u306e\u306f\u3001DR\u30fbBDR\u3068\u305d\u306e\u4ed6\u30eb\u30fc\u30bf\u306e\u9593\u306b\u9650\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-icon_pen wp-block-paragraph\">\u8a66\u9a13\u5bfe\u7b56\uff1a\u300cDR\/BDR\u306f\u30de\u30eb\u30c1\u30a2\u30af\u30bb\u30b9\u74b0\u5883\u3067\u9078\u51fa\u3055\u308c\u308b\u300d\u300cDROTHER\u306fDR\/BDR\u3068\u3060\u3051\u30a2\u30b8\u30e3\u30bb\u30f3\u30b7\u30fc\u3092\u78ba\u7acb\u300d\u3068\u3044\u3063\u305f\u77e5\u8b58\u304c\u3088\u304f\u554f\u308f\u308c\u308b\u306e\u3067\u3001\u3053\u3053\u3092\u78ba\u5b9f\u306b\u62bc\u3055\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">OSPF &#8211; \u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30bf\u30a4\u30d7<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">OSPF\u3067\u306f\u3001\u5229\u7528\u3059\u308b\u30ec\u30a4\u30e42\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u7a2e\u985e\u306b\u5fdc\u3058\u3066\u300c\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30bf\u30a4\u30d7\u300d\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u30eb\u30fc\u30bf\u540c\u58eb\u304c\u3069\u306e\u3088\u3046\u306b\u30cd\u30a4\u30d0\u30fc\u3092\u78ba\u7acb\u3057\u3001DR\/BDR\u3092\u9078\u51fa\u3059\u308b\u304b\u306b\u95a2\u308f\u308b\u91cd\u8981\u306a\u8981\u7d20\u3067\u3059\u3002EIGRP\u306e\u3088\u3046\u306b\u30ec\u30a4\u30e42\u306b\u4f9d\u5b58\u305b\u305a\u30b7\u30fc\u30e0\u30ec\u30b9\u306b\u52d5\u4f5c\u3059\u308b\u30d7\u30ed\u30c8\u30b3\u30eb\u3068\u7570\u306a\u308a\u3001OSPF\u3067\u306f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30bf\u30a4\u30d7\u3092\u7406\u89e3\u3057\u3066\u304a\u304f\u3053\u3068\u304c\u5fc5\u9808\u3068\u306a\u308a\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u4ee3\u8868\u7684\u306a3\u7a2e\u985e\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u2460 \u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u30de\u30eb\u30c1\u30a2\u30af\u30bb\u30b9<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30a4\u30fc\u30b5\u30cd\u30c3\u30c8LAN\u306e\u3088\u3046\u306b\u30011\u3064\u306e\u30bb\u30b0\u30e1\u30f3\u30c8\u306b\u8907\u6570\u306e\u30eb\u30fc\u30bf\u304c\u63a5\u7d9a\u3067\u304d\u308b\u74b0\u5883\u3067\u3059\u3002\u3053\u306e\u5834\u5408\u3001DR\u3068BDR\u304c\u9078\u51fa\u3055\u308c\u3001DROTHER\u30eb\u30fc\u30bf\u306fDR\/BDR\u3068\u3060\u3051\u30a2\u30b8\u30e3\u30bb\u30f3\u30b7\u30fc\u3092\u78ba\u7acb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30eb\u30fc\u30bf\u9593\u306e\u95a2\u4fc2\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DR\/BDR\u3068\u4ed6\u306e\u30eb\u30fc\u30bf\uff1a\u30a2\u30b8\u30e3\u30bb\u30f3\u30b7\u30fc\uff08Full\uff09<\/li>\n\n\n\n<li>DROTHER\u540c\u58eb\uff1a\u30cd\u30a4\u30d0\u30fc\u95a2\u4fc2\uff082Way\uff09<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u305d\u306e\u305f\u3081\u3001\u5927\u898f\u6a21\u306aLAN\u74b0\u5883\u3067\u3082\u52b9\u7387\u3088\u304fLSA\u3092\u3084\u308a\u53d6\u308a\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u2461 \u30dd\u30a4\u30f3\u30c8\u30c4\u30fc\u30dd\u30a4\u30f3\u30c8<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">PPP\u3084HDLC\u3068\u3044\u3063\u305fWAN\u30ea\u30f3\u30af\u3067\u30012\u53f0\u306e\u30eb\u30fc\u30bf\u304c\u76f4\u63a5\u63a5\u7d9a\u3055\u308c\u308b\u74b0\u5883\u3067\u3059\u3002\u3053\u306e\u5834\u5408\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306b\u30eb\u30fc\u30bf\u306f2\u53f0\u3057\u304b\u5b58\u5728\u3057\u306a\u3044\u305f\u3081\u3001DR\u3084BDR\u3092\u9078\u51fa\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7d50\u679c\u3068\u3057\u3066\u30012\u53f0\u306e\u30eb\u30fc\u30bf\u9593\u3067\u306f\u5fc5\u305a\u30a2\u30b8\u30e3\u30bb\u30f3\u30b7\u30fc\uff08Full\uff09\u304c\u78ba\u7acb\u3055\u308c\u307e\u3059\u3002\u30b7\u30f3\u30d7\u30eb\u304b\u3064\u52b9\u7387\u7684\u306a\u63a5\u7d9a\u65b9\u6cd5\u3068\u3044\u3048\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u2462 NBMA\uff08Non-Broadcast Multi-Access\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30d5\u30ec\u30fc\u30e0\u30ea\u30ec\u30fc\u3084ATM\u306e\u3088\u3046\u306b\u3001\u8907\u6570\u306e\u30eb\u30fc\u30bf\u304c1\u3064\u306e\u30bb\u30b0\u30e1\u30f3\u30c8\u306b\u63a5\u7d9a\u3055\u308c\u308b\u3082\u306e\u306e\u3001\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u6a5f\u80fd\u304c\u306a\u3044\u74b0\u5883\u3067\u3059\u3002\u3053\u306e\u5834\u5408\u3082DR\/BDR\u306f\u9078\u51fa\u3055\u308c\u307e\u3059\u304c\u3001\u30cd\u30a4\u30d0\u30fc\u691c\u51fa\u304c\u81ea\u52d5\u3067\u306f\u884c\u3048\u306a\u3044\u305f\u3081\u3001\u57fa\u672c\u7684\u306b\u306f\u7ba1\u7406\u8005\u304c\u30cd\u30a4\u30d0\u30fc\u3092\u624b\u52d5\u3067\u8a2d\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u305f\u3060\u3057\u3001NBMA\u306b\u306f5\u3064\u306e\u30e2\u30fc\u30c9\u304c\u3042\u308a\u3001\u30e2\u30fc\u30c9\u306b\u3088\u3063\u3066\u306f\u81ea\u52d5\u7684\u306b\u30cd\u30a4\u30d0\u30fc\u304c\u691c\u51fa\u3055\u308c\u308b\u30b1\u30fc\u30b9\u3082\u3042\u308a\u307e\u3059\u3002\u8a66\u9a13\u3067\u306f\u300cNBMA\u3067\u306f\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u304c\u4f7f\u3048\u306a\u3044\u305f\u3081\u30cd\u30a4\u30d0\u30fc\u8a2d\u5b9a\u304c\u5fc5\u8981\u300d\u3068\u3044\u3046\u57fa\u672c\u3092\u62bc\u3055\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">OSPF &#8211; 3\u7a2e\u985e\u306e\u30c8\u30dd\u30ed\u30b8\u30fc\u6bd4\u8f03<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u305d\u308c\u305e\u308c\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30bf\u30a4\u30d7\u306b\u304a\u3051\u308b\u52d5\u4f5c\u3092\u6574\u7406\u3059\u308b\u3068\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u30c8\u30dd\u30ed\u30b8\u30fc<\/th><th>\u30cd\u30a4\u30d0\u30fc\u691c\u51fa<\/th><th>DR\/BDR\u306e\u9078\u51fa<\/th><th>Hello\u9593\u9694\uff08\u30c7\u30d5\u30a9\u30eb\u30c8\uff09<\/th><\/tr><\/thead><tbody><tr><td>\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u30de\u30eb\u30c1\u30a2\u30af\u30bb\u30b9<\/td><td>\u81ea\u52d5<\/td><td>\u6709<\/td><td>10\u79d2<\/td><\/tr><tr><td>\u30dd\u30a4\u30f3\u30c8\u30c4\u30fc\u30dd\u30a4\u30f3\u30c8<\/td><td>\u81ea\u52d5<\/td><td>\u7121<\/td><td>10\u79d2<\/td><\/tr><tr><td>NBMA\uff085\u3064\u306e\u30e2\u30fc\u30c9\u3042\u308a\uff09<\/td><td>\u30e2\u30fc\u30c9\u306b\u3088\u308b<\/td><td>\u30e2\u30fc\u30c9\u306b\u3088\u308b<\/td><td>\u30e2\u30fc\u30c9\u306b\u3088\u308b<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"is-style-icon_pen wp-block-paragraph\">\u8a66\u9a13\u5bfe\u7b56\uff1a\u300c\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\uff1dDR\/BDR\u3042\u308a\u300d\u300c\u30dd\u30a4\u30f3\u30c8\u30c4\u30fc\u30dd\u30a4\u30f3\u30c8\uff1dDR\/BDR\u306a\u3057\u300d\u300cNBMA\uff1d\u624b\u52d5\u8a2d\u5b9a\u304c\u5fc5\u8981\u300d\u3068\u3044\u3046\u70b9\u304c\u3088\u304f\u554f\u308f\u308c\u308b\u305f\u3081\u3001\u5fc5\u305a\u6574\u7406\u3057\u3066\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\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\/04\/OSPF\uff08\u69cb\u6210\u8981\u7d20\uff09.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"OSPF\uff08\u69cb\u6210\u8981\u7d20\uff09\u306e\u57cb\u3081\u8fbc\u307f\u3002\"><\/object><a id=\"wp-block-file--media-30653ed5-38fe-489c-b43a-27d4c454252b\" href=\"https:\/\/ccna-curriculum.tech-village.co.jp\/wp-content\/uploads\/2025\/04\/OSPF\uff08\u69cb\u6210\u8981\u7d20\uff09.pdf\">OSPF\uff08\u69cb\u6210\u8981\u7d20\uff09<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>OSPF &#8211; 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