UDLD\u307e\u3068\u3081<\/a><\/p>\n\r\n\u25a1 UDLD\u3068\u306f<\/U>\r\nUDLD (Uni-Directional Link Detection)\u306f\u3001Ethernet\u306e\u5358\u4e00\u30ea\u30f3\u30af(\u7247Link)\u969c\u5bb3\r\n\u3092L2\u3067\u691c\u51fa\u3059\u308b\u305f\u3081\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3059\u3002\r\nAuto-Negtiation\u3067\u7247\u30ea\u30f3\u30af\u969c\u5bb3(RemoteFault)\u691c\u51fa\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u3042\u304f\u307e\u3067\u3082\u3001PHY\u30ec\u30d9\u30eb\u3067\u306e\u691c\u51fa\u3067\u3059\u3002\r\nUDLD\u306fL2Frame\u3092\u9001\u53d7\u4fe1\u3057\u3066\u691c\u51fa\u3059\u308b\u306e\u3067\u3001Link\u304c\u3042\u304c\u3063\u3066\u308b\u3051\u3069\u3001\u9001\u53d7\u4fe1\u3067\u304d\u306a\u3044=\u30b5\u30a4\u30ec\u30f3\u30c8\u6545\u969c\r\n\u3092\u691c\u51fa\u3067\u304d\u307e\u3059\u3002\r\n\r\n\u25a1 UDLD\u306e\u57fa\u672c\u52d5\u4f5c<\/U>\r\nLinkUp\u3059\u308b\u3068\u3001UDLD PDU\u306e\u9001\u53d7\u4fe1\u3057\u3066\u3001\u30cd\u30a4\u30d0\u30fc\u3092\u691c\u51fa\u3092\u691c\u51fa\u3057\u307e\u3059\u3002\r\n\u30cd\u30a4\u30d0\u30fc\u304c\u78ba\u7acb\u3055\u308c\u308b\u3068\u3001Hello\u30d1\u30b1\u30c3\u30c8(\u30d7\u30ed\u30fc\u30d6)\u3092\u9001\u4fe1\u3057\u3066\u3001\u96a3\u63a5\u72b6\u614b\u3092\u3001\u78ba\u8a8d\u3057\u3042\u3044\u307e\u3059\u3002\r\nHello\u304c\u53d7\u4fe1\u3067\u304d\u306a\u304f\u306a\u308b\u3068\u3001\u969c\u5bb3\u3068\u307f\u306a\u3057\u3066\u3001err-disable\u3068\u306a\u308a\u3001\u5bfe\u5411\u30b9\u30a4\u30c3\u30c1\u306eLink\u304cDown\u3057\u307e\u3059\u3002\r\n\r\n\u25a1 UDLD\u306e\u8a2d\u5b9a by cisco<\/U>\r\n\uff0a\u3000\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306fdisable\r\n# \u30b0\u30ed\u30fc\u30d0\u30ebconfig\u3067\u8a2d\u5b9a\r\n(config)# udld [ enable | agressive ]\r\n(config)# udld messeage time \"\u79d2\"\r\n# interface mode\u3067\u8a2d\u5b9a\r\n(config-if)# udld port [ agressive ]\r\n\r\n* normal-mode\u3067\u306f\u3000\u5bfe\u5411\u304c\u3001\u53d7\u4fe1\u3067\u304d\u3066\u3044\u306a\u3044\u60c5\u5831\u304c\u5165\u3063\u305fPDU\u3092\u53d7\u4fe1\u3059\u308b\u3068\u3001err-disable\r\n* agressive-mode\u3067\u306f\u3001\u5bfe\u5411\u304b\u3089\u306ePDU\u304c\u53d7\u4fe1\u3067\u304d\u306a\u3044\u306e\u307f\u306e\u6761\u4ef6\u3067err-disable\r\n\r\n# UDLD\u306edisable\u5316\r\n(config)# no udld [ enable | agressive ]\r\n(config-if)# no udld port [ agressive ]\r\n\r\n* no\u30b3\u30de\u30f3\u30c9\u3067disable\u3057\u305f\u969b\u306b\u3001flash\u306enotify\u3092\u6295\u3052\u3066\u3001\u30cd\u30a4\u30d0\u30fc\u306b\u96a3\u63a5\u95a2\u4fc2\u306e\u89e3\u9664\u3055\u305b\u307e\u3059\u3002\r\n\u3000\u306a\u306e\u3067\u3001no\u30b3\u30de\u30f3\u30c9\u3067disable\u3092\u3057\u305f\u304b\u3089\u3001\u96a3\u63a5\u304cerr-disable\u306b\u843d\u3061\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\r\n\r\n\u25a1 UDLD \u30d5\u30ec\u30fc\u30e0<\/U>\r\nUDLD\u306fL2\u30d5\u30ec\u30fc\u30e0\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3067\u3059\u3002\r\nCisco\u3060\u3068\u3001Dst-Mac\u306bCDP\u3068\u540c\u3058MAC\"01-00-0c-cc-cc-cc\"\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002\r\n\r\nL2Frame\u306b\u76f4\u63a5Data\u3092\u306e\u305b\u308b\u305f\u3081\u3001LLC\u306bSNAP\u30d8\u30c3\u30c0\u3092\u3064\u3051\u3066\u3001L3\u30d5\u30ec\u30fc\u30e0\u3092\u6a21\u64ec\u3057\u307e\u3059\u3002\r\n\u901a\u904e\u3059\u308b\u6a5f\u5668\u306f\u3001\u3042\u304f\u307e\u3067\u3082L2\u30d5\u30ec\u30fc\u30e0\u3067\u3001forwading\u3055\u308c\u307e\u3059\u3002\r\n\r\nData\u3067\u4ed8\u4e0e\u3055\u308c\u308b\u30d1\u30e9\u30e1\u30fc\u30bf\u306f\u4ee5\u4e0b\u3067\u3059\u3002\r\n\r\nDevice ID TLV\u30fb\u30fb\u30fb\u30fb\u30fb\u30fb\u30fb\u81ea\u8eab\u306e\u6a5f\u5668ID\r\nPort ID TLV\u30fb\u30fb\u30fb\u30fb\u30fb\u30fb\u30fb\u30fb\u81ea\u8eab\u306e\u9001\u4fe1port\r\nEcho TLV\u30fb\u30fb\u30fb\u30fb\u30fb\u30fb\u30fb\u30fb\u30fb\u30cd\u30a4\u30d0\u30fc\u306eDatabase\r\nMessage Interval TLV\u30fb\u30fb\u30fb\u9001\u4fe1\u9593\u9694\r\nTimeout Interval TLV\u30fb\u30fb\u30fb\u30c7\u30a3\u30af\u30b7\u30e7\u30f3\u30a6\u30a4\u30f3\u30c9\u30a6\u306e\u9577\u3055\r\nDevice Name TLV\u30fb\u30fb\u30fb\u30fb\u30fbhost name\r\nSequence Number TLV\u30fb\u30fb\u30fb\u30b7\u30fc\u30b1\u30f3\u30b9\u756a\u53f7\r\n
# show udld neighbor<\/p>\r\n\u3067\u3053\u306e\u3042\u305f\u308a\u306e\u60c5\u5831\u304c\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002\r\n\r\n\u25a1 UDLD\u306f\u3044\u3064\u4f7f\u3046\u306e\u304b<\/U>\r\n\u3053\u3053\u304b\u3089\u304c\u672c\u984c\u3002\r\n\u30b5\u30a4\u30ec\u30f3\u30c8\u969c\u5bb3\u3067\u3001\u8a72\u5f53Link\u3092\u843d\u3068\u3057\u305f\u3044\u5834\u5408\u306f\u3001\r\n\u8fc2\u56de\u8def\u304c\u3042\u308b\u306e\u3067\u3001Link\u30c0\u30a6\u30f3\u3055\u305b\u3066\u7d4c\u8def\u8fc2\u56de\u3055\u305b\u305f\u3044\u6642\u304b\u3068\u3002\r\n\r\n\u8003\u3048\u3089\u308c\u308b\u8fc2\u56de\u8def\u306f\uff1f\r\n\u25cbL2\r\n\u30fbLinkAggregation \u2192 LACP\u3067\u30b5\u30a4\u30ec\u30f3\u30c8\u969c\u5bb3\u56de\u907f\r\n\r\n\u25cbL3\r\n\u30fbOSPF \u2192 keepalive\u3057\u3066\u308b\r\n\u30fbBGP \u2192 keepalive\u3057\u3066\u308b\r\n\r\n\u3067\u3059\u3002\r\nOSPF,BGP\u306f\u305d\u3082\u305d\u3082\u4e0a\u4f4dLayer(L3)\u3067\u52d5\u4f5c\u3057\u3066\u3044\u308b\u306e\u3067\u3001\r\n\u308f\u3056\u308f\u3056UDLD\u3057\u306a\u304f\u3066\u3082\u3044\u3044\u3088\u3046\u306b\u601d\u3046(\u3068\u3044\u3046\u304b\u7121\u99c4)\u3002\r\n(\u30b3\u30f3\u30d0\u30fc\u30b8\u30a7\u30f3\u30b9\u306b\u95a2\u3057\u3066\u3082\u305d\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u306b\u3042\u308f\u305b\u3066timer\u306a\u3069\u3092\u8abf\u6574\u3059\u308b\u3079\u304d\u304b\u3068\u3002)\r\n\r\n\u5225vlan\u306bstatic\u30672\u7d4c\u8def\u307f\u305f\u3044\u306a\u69cb\u6210\u3060\u3068\u3001(\u9593\u306b\u30b9\u30a4\u30c3\u30c1\u304b\u3093\u3067\u305f\u308a\u3068\u304b\uff1f)\u610f\u5473\u3042\u308b\u304b\u3082\u3002\r\n\u3067\u3082\u305d\u308c\u3063\u3066\u3001\u30c7\u30b6\u30a4\u30f3\u304c\u60aa\u3044\u3058\u3083\u306a\u3044\u304b\u3068\u601d\u3044\u307e\u3059\u3002\r\n\r\n\u25a1 UDLD\u306e\u6ce8\u610f<\/U>\r\nUDLD\u306f\u5bfe\u5411\u6a5f\u5668\u540c\u58eb\u3067\u8a2d\u5b9a\u3059\u308b\u3082\u306e\u3067\u3059\u304c\u3001\u30d5\u30ec\u30fc\u30e0\u306e\u3068\u304a\u308a\u3001L2\u3067\u900f\u904e\u3057\u3066\u3057\u307e\u3044\u307e\u3059\u3002\r\n
# R1 1\/1 routed-port\/udld aggresive\/vrrp\r\n# R2 1\/1 routed-port\/udld aggresive\/vrrp\r\n# L2 \u8a2d\u5b9a\u306a\u3057(native vlan)\r\n+------+ +------+\r\n| R1 |-------| R2 |\r\n+------+ +------+\r\n (1\/1) (1\/1)\r\n | |\r\n+------+ +------+\r\n| L2 |-------| L2 |\r\n+------+ +------+\r\n\r\n* \u3053\u3093\u306a\u3053\u3068\u3059\u308b\u3068\u30011\/1 \u540c\u58eb\u3067\u3001UDLD neigbhor\u304c\u306f\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002\r\n R1\/R2\u306e1\/1\u3069\u3061\u3089\u304b\u304c\u843d\u3061\u308b\u3068\u3001UDLD\u3067\u5bfe\u5411\u3082down\u3057\u3066\u3001\r\n\u3000VRRP\u306e\u4e21\u7cfb\u304c\u304a\u3061\u308b\u3068\u3044\u3046\u60b2\u60e8\u306a\u4e8b\u6545\u306b\u306a\u308b\u3058\u3083\u306a\u3044\u304b\u3068(\u691c\u8a3c\u3057\u3066\u307e\u305b\u3093\u304c)<\/p>\r\n\r\n(\u8ffd\u8a18)\r\n\u4ee5\u964d\u51fa\u4f1a\u3046\u3053\u3068\u304c\u306a\u3044\u304b\u3082\u3057\u308c\u306a\u3044\u3002UDLD\u3002\u8cb4\u91cd\u3067\u3057\u305f\u3002\r\n\u5984\u60f3\u3067\u3059\u304c\u3001\u3042\u3093\u307e\u308a\u904b\u7528\u3055\u308c\u3066\u306a\u3044\u30fb\u67af\u308c\u3066\u306a\u3044\r\n\u7570\u7a2e\u30d9\u30f3\u30c0\u9593\u3067\u4f7f\u7528\u3059\u308b\u5834\u5408\u306f\u3001\u691c\u8a3cMUST\u306e\u3088\u3046\u306a\u6c17\u304c\u3057\u307e\u3059\u3002\r\n<\/pre>\n
<\/tt><\/P><\/p>\n","protected":false},"excerpt":{"rendered":"
\u25cb UDLD (Uni-Directional Link Detection) UDLD\u306a\u3093\u3066\u3001\u805e\u3044\u305f\u3053\u3068\u3042\u308b\u304f\u3089\u3044\u3060\u3063\u305f\u306e\u3067\u3059\u304c\u3001 \u696d\u52d9\u3067\u767b\u5834\u3057\u3066\u304d\u305f\u306e\u3067\u3001\u3061\u3087\u3063\u3068\u307e\u3068\u3081\u3002 \u6700\u5f8c\u306e\u8003\u5bdf\u3067\u66f8\u304d\u307e\u3059\u304c\u3001\u6700\u8fd1\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30c7 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-437","post","type-post","status-publish","format-standard","hentry","category-ethernet"],"_links":{"self":[{"href":"https:\/\/blog.k-goo.net\/index.php?rest_route=\/wp\/v2\/posts\/437","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.k-goo.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.k-goo.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.k-goo.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.k-goo.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=437"}],"version-history":[{"count":17,"href":"https:\/\/blog.k-goo.net\/index.php?rest_route=\/wp\/v2\/posts\/437\/revisions"}],"predecessor-version":[{"id":497,"href":"https:\/\/blog.k-goo.net\/index.php?rest_route=\/wp\/v2\/posts\/437\/revisions\/497"}],"wp:attachment":[{"href":"https:\/\/blog.k-goo.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=437"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.k-goo.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=437"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.k-goo.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=437"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}