{"id":1032,"date":"2023-08-02T19:04:11","date_gmt":"2023-08-02T10:04:11","guid":{"rendered":"http:\/\/daimaru-tech-blog.com\/?p=1032"},"modified":"2025-07-05T12:21:27","modified_gmt":"2025-07-05T03:21:27","slug":"%e3%80%90%e3%83%8d%e3%83%83%e3%83%88%e3%83%af%e3%83%bc%e3%82%af%e5%9f%ba%e7%a4%8e%e3%83%bb%e5%85%a5%e9%96%80%e3%80%91stp-rstp%e3%81%aepriority%e3%82%84%e3%83%91%e3%82%b9%e3%82%b3%e3%82%b9%e3%83%88","status":"publish","type":"post","link":"https:\/\/daimaru-tech-blog.com\/?p=1032","title":{"rendered":"\u3010\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u57fa\u790e\u30fb\u5165\u9580\u3011STP\/RSTP\u306ePriority\u3084\u30d1\u30b9\u30b3\u30b9\u30c8\u3092\u5fa9\u7fd2\u3057\u3066\u307f\u305f\uff08CCNA\uff09\uff08\u8aad\u4e86\u76ee\u5b89\uff1a5min~10min\uff09"},"content":{"rendered":"\n

\u306f\u3058\u3081\u306b<\/h2>\n\n\n\n

\u3000\u3053\u3093\u306b\u3061\u306f\u3002\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u300c\u3060\u3044\u307e\u308b\u300d<\/span><\/span><\/strong>\u3067\u3059\u3002<\/p>\n\n\n\n

\u4eca\u56de\u306fSTP\/RSTP\u30b7\u30ea\u30fc\u30ba\u306e\u7b2c\u4e8c\u5f3e\u3068\u3057\u3066\u3001Priority\u5909\u66f4\u3084\u30d1\u30b9\u30b3\u30b9\u30c8\u5909\u66f4\u306b\u3064\u3044\u3066\u5fa9\u7fd2<\/span><\/strong>\u3057\u3066\u307f\u305f\u306e\u3067\u3001\u305d\u306e\u307e\u3068\u3081\u3092\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

\u6700\u8fd1\u307e\u3059\u307e\u3059\u3068\u624b\u3092\u52d5\u304b\u3057\u3066\u3057\u3063\u304b\u308a\u78ba\u8a8d\u3059\u308b\u3053\u3068\u306f\u975e\u5e38\u306b\u91cd\u8981\u3060\u306a\u3068\u611f\u3058\u3066\u3044\u308b\u6700\u4e2d\u3067\u3054\u3056\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

\u4eca\u56de\u78ba\u8a8d\u3057\u305f\u3053\u3068\u306f\u5168\u90e8\u3067\uff13\u3064\uff01\uff01<\/p>\n\n\n\n

\n
    \n
  1. Priority\u306b\u3088\u308b\u30eb\u30fc\u30c8\u30d6\u30ea\u30c3\u30b8\u306e\u5909\u66f4\uff08\u30eb\u30fc\u30c8\u30d6\u30ea\u30c3\u30b8\u306e\u8fc2\u56de\uff09<\/li>\n\n\n\n
  2. Path Cost\u306b\u3088\u308b\u30dd\u30fc\u30c8\u5f79\u5272\u306e\u5909\u66f4<\/li>\n\n\n\n
  3. \u30dd\u30fc\u30c8\u30d7\u30e9\u30a4\u30aa\u30ea\u30c6\u30a3\u306e\u5909\u66f4\uff08\u52d5\u4f5c\u78ba\u8a8d\u3060\u3051\uff09<\/li>\n<\/ol>\n<\/div><\/div>\n\n\n\n

    Priority\u306b\u3088\u308b\u30eb\u30fc\u30c8\u30d6\u30ea\u30c3\u30b8\u306e\u5909\u66f4\uff08\u30eb\u30fc\u30c8\u30d6\u30ea\u30c3\u30b8\u306e\u8fc2\u56de\uff09<\/h2>\n\n\n\n

    \u3000\uff11\u3064\u76ee\u306ePriority\u5909\u66f4\u306f\u3001\u300c\u3010\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u57fa\u790e\u30fb\u5165\u9580\u3011STP\/RSTP\u3092\u5fa9\u7fd2\u306e\u305f\u3081\u306b\u5c11\u3057\u6df1\u6398\u308a\u3057\u3066\u307f\u305f\uff08CCNA\uff09\uff08\u8aad\u4e86\u76ee\u5b89\uff1a5min~10min\uff09<\/a>\u300d\u3067\u3082\u8aac\u660e\u3057\u305f\u901a\u308a\u3001\u30d6\u30ea\u30c3\u30b8ID\u306e\u4e00\u90e8\u306bPriority\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u6301\u3063\u3066\u304a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

    \u305d\u306e\u30d7\u30e9\u30a4\u30aa\u30ea\u30c6\u30a3\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u3067\u30d6\u30ea\u30c3\u30b8ID\u304c\u5909\u308f\u308a\u3001\u30eb\u30fc\u30c8\u30d6\u30ea\u30c3\u30b8\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\u306e\u3067\u3059\u3002<\/p>\n\n\n\n

    \u3067\u306f\u3001\u52d5\u4f5c\u78ba\u8a8d\u3092\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n

    \u52d5\u4f5c\u78ba\u8a8d\u3092\u5b9f\u65bd\u3057\u305f\u69cb\u6210<\/h3>\n\n\n\n

    \u4eca\u56de\u3001\u52d5\u4f5c\u78ba\u8a8d\u3092\u5b9f\u65bd\u3057\u305f\u69cb\u6210\u306f\u524d\u56de\u306e\u8a18\u4e8b<\/a>\u3068\u540c\u69d8\u306e\u56db\u89d2\u5f62\u306e\u69cb\u6210\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

    \u53f3\u4e0a\u306eL2SW\u3092\u30eb\u30fc\u30c8\u30d6\u30ea\u30c3\u30b8\u306b\u3059\u308b\u305f\u3081\u3001Priority\u30924096\u306b\u5909\u66f4\u3057\u3066\u304a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

    \u305d\u308c\u4ee5\u5916\u306e\u30dd\u30fc\u30c8\u5f79\u5272\u306b\u3064\u3044\u3066\u306f\u3001\u56f3\u306b\u8a18\u8f09\u306e\u901a\u308a\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
    L2SW1
    Priority\uff1a32768<\/div><\/div><\/div><\/foreignObject>L2SW1…<\/text><\/switch><\/g>
    Gi0\/1<\/div><\/div><\/div><\/foreignObject>Gi0\/1<\/text><\/switch><\/g>
    Gi0\/0<\/div><\/div><\/div><\/foreignObject>Gi0\/0<\/text><\/switch><\/g>
    Gi0\/1<\/div><\/div><\/div><\/foreignObject>Gi0\/1<\/text><\/switch><\/g>
    Gi0\/1<\/div><\/div><\/div><\/foreignObject>Gi0\/1<\/text><\/switch><\/g>
    Gi0\/0<\/div><\/div><\/div><\/foreignObject>Gi0\/0<\/text><\/switch><\/g>
    Gi0\/0<\/div><\/div><\/div><\/foreignObject>Gi0\/0<\/text><\/switch><\/g>
    Gi0\/0<\/div><\/div><\/div><\/foreignObject>Gi0\/0<\/text><\/switch><\/g>
    Gi0\/1<\/div><\/div><\/div><\/foreignObject>Gi0\/1<\/text><\/switch><\/g>
    L2SW2
    Priority\uff1a4096<\/div><\/div><\/div><\/foreignObject>L2SW2…<\/text><\/switch><\/g>
    L2SW3
    Priority\uff1a32768<\/div><\/div><\/div><\/foreignObject>L2SW3…<\/text><\/switch><\/g>
    L2SW4
    Priority\uff1a32768<\/div><\/div><\/div><\/foreignObject>L2SW4…<\/text><\/switch><\/g>
    DP<\/b><\/div><\/div><\/div><\/foreignObject>DP<\/text><\/switch><\/g>
    DP<\/b><\/div><\/div><\/div><\/foreignObject>DP<\/text><\/switch><\/g>
    \u30d1\u30b9\u30b3\u30b9\u30c8\uff1a4<\/div><\/div><\/div><\/foreignObject>\u30d1\u30b9\u30b3\u30b9\u30c8\uff1a4<\/text><\/switch><\/g>
    DP<\/b><\/div><\/div><\/div><\/foreignObject>DP<\/text><\/switch><\/g>
    RP<\/b><\/div><\/div><\/div><\/foreignObject>RP<\/text><\/switch><\/g>
    DP<\/b><\/div><\/div><\/div><\/foreignObject>DP<\/text><\/switch><\/g>
    RP<\/b><\/div><\/div><\/div><\/foreignObject>RP<\/text><\/switch><\/g>
    RP<\/b><\/div><\/div><\/div><\/foreignObject>RP<\/text><\/switch><\/g>
    Alt<\/b><\/div><\/div><\/div><\/foreignObject>Alt<\/text><\/switch><\/g>
    \u30d1\u30b9\u30b3\u30b9\u30c8\uff1a4<\/div><\/div><\/div><\/foreignObject>\u30d1\u30b9\u30b3\u30b9\u30c8\uff1a4<\/text><\/switch><\/g>
    \u30d1\u30b9\u30b3\u30b9\u30c8\uff1a8<\/div><\/div><\/div><\/foreignObject>\u30d1\u30b9\u30b3\u30b9\u30c8\uff1a8<\/text><\/switch><\/g><\/g>Text is not SVG – cannot display<\/text><\/a><\/switch><\/svg>\n\n\n\n

    \u4e0a\u8a18\u306e\u69cb\u6210\u304b\u3089\u5de6\u4e0a\u306eL2SW1\u3092\u30eb\u30fc\u30c8\u30d6\u30ea\u30c3\u30b8\u306b\u5909\u66f4\u3059\u308b\u72b6\u614b\u3092\u78ba\u8a8d\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

    \u4e8b\u524d\u72b6\u614b<\/h3>\n\n\n\n

    \u3000\u307e\u305a\u3001\u4e8b\u524d\u72b6\u614b\u306e\u30ed\u30b0\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n

    L2SW1\u306e\u72b6\u614b<\/h4>\n\n\n\n

    \u3000\u4ee5\u4e0b\u306e\u30ed\u30b0\u3088\u308a\u3001L2SW1\u306f\u30eb\u30fc\u30c8\u30d6\u30ea\u30c3\u30b8\u3067\u306f\u306a\u3044\u3053\u3068\u306e\u78ba\u8a8d\u3084\u5404\u30dd\u30fc\u30c8\u306e\u5f79\u5272\u306e\u78ba\u8a8d\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n

    \u5177\u4f53\u7684\u306b\u306f\u3001\u4e0a\u304b\u30892\u884c\u76ee\u30684\u884c\u76ee\u306e\u8d64\u6587\u5b57\u306e\u90e8\u5206\u3067\u30eb\u30fc\u30c8\u30d6\u30ea\u30c3\u30b8\u304b\u3069\u3046\u304b\u306e\u5224\u65ad<\/span><\/strong>\u304c\u3064\u304d\u307e\u3059\u3002<\/p>\n\n\n\n

    \uff12\u884c\u76ee\u3068\uff14\u884c\u76ee\u306e\u30d7\u30e9\u30a4\u30aa\u30ea\u30c6\u30a3\u3084\u30a2\u30c9\u30ec\u30b9\u304c\u540c\u4e00\u3067\u3042\u308c\u3070\u3001\u305d\u306e\u30b9\u30a4\u30c3\u30c1\u304c\u30eb\u30fc\u30c8\u30d6\u30ea\u30c3\u30b8\u3068\u306a\u308a\u3001\u7570\u306a\u308b\u5834\u5408\u306f\u4ed6\u306e\u30b9\u30a4\u30c3\u30c1\u304c\u30eb\u30fc\u30c8\u30d6\u30ea\u30c3\u30b8\u3068\u306a\u308a\u307e\u3059\u3002<\/strong><\/p>\n\n\n\n

    \u307e\u305f\u3001\u30dd\u30fc\u30c8\u306e\u5f79\u5272\u3084\u30eb\u30fc\u30c8\u30dd\u30fc\u30c8\u306e\u5834\u6240\u306b\u3064\u3044\u3066\u306f\u6a59\u6587\u5b57\u306e\u90e8\u5206\u3067\u5224\u65ad\u53ef\u80fd<\/span><\/strong>\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

    VLAN0002 is executing the rstp compatible Spanning Tree protocol\nBridge Identifier has priority 32768, sysid 2, address 5254.0009.652d<\/span><\/strong>\u3000\u203b\u30d6\u30ea\u30c3\u30b8ID<\/strong><\/span>\nConfigured hello time 2, max age 20, forward delay 15, transmit hold-count 6\nCurrent root has priority 4098, address 5254.0007.55ed<\/span><\/strong>\u3000\u203bRoot\u30d6\u30ea\u30c3\u30b8\u306ePriority<\/span>\nRoot port is 2 (GigabitEthernet0\/1), cost of root path is 4<\/span><\/strong>\nTopology change flag set, detected flag not set\nNumber of topology changes 7 last change occurred 00:00:19 ago\nfrom GigabitEthernet0\/0\nTimes:  hold 1, topology change 35, notification 2\nhello 2, max age 20, forward delay 15\nTimers: hello 0, topology change 16, notification 0, aging 300\n\nPort 1 (GigabitEthernet0\/0) of VLAN0002 is designated forwarding<\/strong>\u3000\u203b\u30dd\u30fc\u30c8\u756a\u53f7\/\u30dd\u30fc\u30c8\u5f79\u5272<\/strong><\/span>\nPort path cost 4, Port priority 128, Port Identifier 128.1.\nDesignated root has priority 4098, address 5254.0007.55ed\nDesignated bridge has priority 32770, address 5254.0009.652d\nDesignated port id is 128.1, designated path cost 4\nTimers: message age 0, forward delay 0, hold 0\nNumber of transitions to forwarding state: 4\nLink type is point-to-point by default\nBPDU: sent 993, received 37\n\nPort 2 (GigabitEthernet0\/1) of VLAN0002 is root forwarding<\/strong>\u3000\u203b\u30dd\u30fc\u30c8\u756a\u53f7\/\u30dd\u30fc\u30c8\u5f79\u5272<\/strong><\/span>\nPort path cost 4, Port priority 128, Port Identifier 128.2.\nDesignated root has priority 4098, address 5254.0007.55ed\nDesignated bridge has priority 4098, address 5254.0007.55ed\nDesignated port id is 128.2, designated path cost 0\nTimers: message age 16, forward delay 0, hold 0\nNumber of transitions to forwarding state: 1\nLink type is point-to-point by default\nBPDU: sent 958, received 70<\/code><\/pre>\n\n\n\n
    L2SW2\u306e\u72b6\u614b<\/h4>\n\n\n\n
    \u3000L2SW1\u3068\u540c\u69d8\u306e\u30b3\u30de\u30f3\u30c9\u3067L2SW2\u306b\u3064\u3044\u3066\u3082\u78ba\u8a8d\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
    L2SW1\u3068\u540c\u69d8\u306b\u8d64\u6587\u5b57<\/span><\/strong>\u3068\u6a59\u6587\u5b57<\/span><\/strong>\u3067\u5206\u3051\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n\n\n\n
    \u8d64\u6587\u5b57\u90e8\u5206\u3067\u30eb\u30fc\u30c8\u30d6\u30ea\u30c3\u30b8\u3067\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3067\u304d\u3001\u6a59\u6587\u5b57\u90e8\u5206\u3067\u5404\u30dd\u30fc\u30c8\u304cDP\uff08Designated Port\uff09\u3067\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/strong><\/p>\n\n\n\n
    L2SW2#show spanning-tree vlan 2 detail\n\nVLAN0002 is executing the rstp compatible Spanning Tree protocol\nBridge Identifier has priority 4096, sysid 2, address 5254.0007.55ed<\/span><\/strong>\nConfigured hello time 2, max age 20, forward delay 15, transmit hold-count 6\nWe are the root of the spanning tree<\/strong><\/span>\nTopology change flag not set, detected flag not set\nNumber of topology changes 5 last change occurred 00:00:48 ago\nfrom GigabitEthernet0\/0\nTimes:  hold 1, topology change 35, notification 2\nhello 2, max age 20, forward delay 15\nTimers: hello 0, topology change 0, notification 0, aging 300\n\nPort 1 (GigabitEthernet0\/0) of VLAN0002 is designated forwarding<\/strong><\/span>\nPort path cost 4, Port priority 128, Port Identifier 128.1.\nDesignated root has priority 4098, address 5254.0007.55ed\nDesignated bridge has priority 4098, address 5254.0007.55ed\nDesignated port id is 128.1, designated path cost 0\nTimers: message age 0, forward delay 0, hold 0\nNumber of transitions to forwarding state: 1\nLink type is point-to-point by default\nBPDU: sent 996, received 35\n\nPort 2 (GigabitEthernet0\/1) of VLAN0002 is designated forwarding<\/strong><\/span>\nPort path cost 4, Port priority 128, Port Identifier 128.2.\nDesignated root has priority 4098, address 5254.0007.55ed\nDesignated bridge has priority 4098, address 5254.0007.55ed\nDesignated port id is 128.2, designated path cost 0\nTimers: message age 0, forward delay 0, hold 0\nNumber of transitions to forwarding state: 2\nLink type is point-to-point by default\nBPDU: sent 70, received 954<\/code><\/pre>\n\n\n\n
    \u5909\u66f4\u6642\u306e\u30b3\u30de\u30f3\u30c9\uff06\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0<\/h3>\n\n\n\n
    L2SW1\u306ePriority\u30920\u306b\u3059\u308b\u3053\u3068\u3067\u30eb\u30fc\u30c8\u30d6\u30ea\u30c3\u30b8\u306b\u5909\u66f4\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
    L2SW1\u306e\u5909\u66f4\u30b3\u30de\u30f3\u30c9\uff06\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0<\/h4>\n\n\n\n
    \u3000Configuration\u30e2\u30fc\u30c9\u306b\u5165\u308a\u3001\u300cspanning-tree vlan <vlan id> priority 0\u300d\u3067\u5909\u66f4\u3057\u307e\u3059\u3002<\/strong><\/p>\n\n\n\n
    \u30b3\u30de\u30f3\u30c9\u306e\u6295\u5165\u76f4\u5f8c\u3001\u5373\u5ea7\u306b\u66f4\u65b0\u304c\u8d70\u308a\u30eb\u30fc\u30c8\u30d6\u30ea\u30c3\u30b8\u306b\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0\u304b\u3089\u8aad\u307f\u53d6\u308c\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/span><\/strong><\/p>\n\n\n\n
    L2SW1#conf t\nEnter configuration commands, one per line.  End with CNTL\/Z.\nL2SW1(config)#spanning-tree vlan 2 priority 0\nL2SW1(config)#end\nL2SW1#\n*Jul 30 23:29:00.769: setting bridge id (which=1) prio 2 prio cfg 0 sysid 2 (on) id 0002.5254.0009.652d\n*Jul 30 23:29:00.769: RSTP(2): updt roles, received superior bpdu on Gi0\/1\n*Jul 30 23:29:00.769: RSTP(2): we become the root bridge<\/span><\/strong>\n*Jul 30 23:29:00.769: RSTP(2): Gi0\/1 is now designated<\/code><\/pre>\n\n\n\n
    \u3067\u306f\u3001\u6b21\u306bL2SW2\u306e\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
    L2SW2\u306e\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0<\/h4>\n\n\n\n
    \u3000L2SW1\u306e\u30b3\u30de\u30f3\u30c9\u6295\u5165\u5f8c\u3001\u6b63\u78ba\u306a\u6642\u9593\u306f\u308f\u304b\u308a\u307e\u305b\u3093\u304c\u5927\u4f538\u79d2\u5f8c\u3050\u3089\u3044\uff08\u6642\u9593\u304c\u305a\u308c\u3066\u3044\u308b\u6c17\u304c\u3057\u307e\u3059\u304c\uff09\u306b\u5f79\u5272\u304c\u5909\u308f\u3063\u305f\u3053\u3068\u3092\u691c\u77e5\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
    *Jul 30 23:29:08.706: RSTP(2): updt roles, received superior bpdu on Gi0\/1\n*Jul 30 23:29:08.706: RSTP(2): Gi0\/1 is now root port\n*Jul 30 23:29:08.706: STP[2]: Generating TC trap for port GigabitEthernet0\/1<\/code><\/pre>\n\n\n\n
    \u30c7\u30d0\u30c3\u30b0\u30ed\u30b0\u3067\u5909\u66f4\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u306f\u78ba\u8a8d\u3067\u304d\u3066\u3044\u307e\u3059\u304c\u3001\u4e8b\u5f8c\u72b6\u614b\u306e\u78ba\u8a8d\u3068\u3057\u3066\u5148\u7a0b\u306e\u30b3\u30de\u30f3\u30c9\u306e\u7c21\u6613\u7248\u3067\u5ff5\u306e\u305f\u3081\u306b\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
    \u4e8b\u5f8c\u72b6\u614b\u78ba\u8a8d<\/h3>\n\n\n\n
    L2SW1\u306e\u4e8b\u5f8c\u72b6\u614b\u78ba\u8a8d<\/h4>\n\n\n\n
    \u3000\u307e\u305a\u3001L2SW1\u306e\u4e8b\u5f8c\u72b6\u614b\u304b\u3089\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
    \u51fa\u529b\u3055\u308c\u305f\u30ed\u30b0\u3092\u898b\u3066\u3044\u304f\u3068L2SW1\u304cPriority\u304c\u5c0f\u3055\u304f\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u3068\u30eb\u30fc\u30c8\u30d6\u30ea\u30c3\u30b8\u306b\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u3001\u30dd\u30fc\u30c8\u306e\u5f79\u5272\u304c\u5168\u3066DP\u306b\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u308b<\/span><\/span><\/strong>\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
    L2SW1#show spanning-tree vlan 2\n\nVLAN0002\nSpanning tree enabled protocol rstp\nRoot ID    Priority    2<\/strong>\nAddress     5254.0009.652d\nThis bridge is the root<\/strong>\nHello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec\n\nBridge ID  Priority    2      (priority 0 sys-id-ext 2)\nAddress     5254.0009.652d<\/strong>\nHello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec\nAging Time  300 sec\n\nInterface           Role Sts Cost      Prio.Nbr Type\n------------------- ---- --- --------- -------- --------------------------------\nGi0\/0               Desg FWD 4         128.1    P2p\nGi0\/1               Desg FWD 4         128.2    P2p<\/strong><\/code><\/pre>\n\n\n\n
    L2SW2\u306e\u4e8b\u5f8c\u72b6\u614b\u78ba\u8a8d<\/h4>\n\n\n\n
    \u3000\u6b21\u306bL2SW2\u306e\u72b6\u614b\u78ba\u8a8d\u3067\u3059\u3002<\/p>\n\n\n\n
    \u3053\u3061\u3089\u306f\u3001\u30d7\u30e9\u30a4\u30aa\u30ea\u30c6\u30a3\u304c4096\u306e\u307e\u307e\u306a\u306e\u3067\u30eb\u30fc\u30c8\u30d6\u30ea\u30c3\u30b8\u60c5\u5831\u304cL2SW1\u306b\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
    L2SW2#show spanning-tree vlan 2\n\nVLAN0002\nSpanning tree enabled protocol rstp\nRoot ID    Priority    2\nAddress     5254.0009.652d\nCost        4\nPort        2 (GigabitEthernet0\/1)\nHello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec\n<\/strong>\nBridge ID  Priority    4098   (priority 4096 sys-id-ext 2)\nAddress     5254.0007.55ed\nHello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec\nAging Time  300 sec\n\nInterface           Role Sts Cost      Prio.Nbr Type\n------------------- ---- --- --------- -------- --------------------------------\nGi0\/0               Desg FWD 4         128.1    P2p\nGi0\/1               Root FWD 4         128.2    P2p<\/code><\/pre>\n\n\n\n
     \u4e0a\u8a18\u306e\u3088\u3046\u306b\u30eb\u30fc\u30c8\u30d6\u30ea\u30c3\u30b8\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u3067STP\u306e\u8fc2\u56de\u3092\u9ad8\u901f\u306b\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002
    \u203bPing\u3067\u78ba\u8a8d\u3057\u305f\u7d50\u679c\u3001STP\u3060\u306830sec\u7a0b\u5ea6\u3000RSTP\u3060\u30684sec\u7a0b\u5ea6\u306e\u65ad\u6642\u9593\u304c\u3042\u308a\u307e\u3057\u305f\u3002<\/p>\n\n\n\n
    Path Cost\u306b\u3088\u308b\u30dd\u30fc\u30c8\u5f79\u5272\u306e\u5909\u66f4\uff08\u4e00\u90e8\u533a\u9593\u306e\u8fc2\u56de\uff09<\/h2>\n\n\n\n
    \u3000Path Cost\u306b\u3088\u308b\u30dd\u30fc\u30c8\u5f79\u5272\u306e\u5909\u66f4\u3084\u4e00\u90e8\u533a\u9593\u306e\u307f\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u6d41\u3057\u305f\u304f\u306a\u3044\u6642\u306b\u4f7f\u3048\u308b\u8a2d\u5b9a\u5909\u66f4\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
    \u69cb\u6210\u306fPriority\u5909\u66f4\u6642\u3068\u540c\u69d8\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
    L2SW1
    Priority\uff1a32768<\/div><\/div><\/div><\/foreignObject>L2SW1…<\/text><\/switch><\/g>
    Gi0\/1<\/div><\/div><\/div><\/foreignObject>Gi0\/1<\/text><\/switch><\/g>
    Gi0\/0<\/div><\/div><\/div><\/foreignObject>Gi0\/0<\/text><\/switch><\/g>
    Gi0\/1<\/div><\/div><\/div><\/foreignObject>Gi0\/1<\/text><\/switch><\/g>
    Gi0\/1<\/div><\/div><\/div><\/foreignObject>Gi0\/1<\/text><\/switch><\/g>
    Gi0\/0<\/div><\/div><\/div><\/foreignObject>Gi0\/0<\/text><\/switch><\/g>
    Gi0\/0<\/div><\/div><\/div><\/foreignObject>Gi0\/0<\/text><\/switch><\/g>
    Gi0\/0<\/div><\/div><\/div><\/foreignObject>Gi0\/0<\/text><\/switch><\/g>
    Gi0\/1<\/div><\/div><\/div><\/foreignObject>Gi0\/1<\/text><\/switch><\/g>
    L2SW2
    Priority\uff1a4096<\/div><\/div><\/div><\/foreignObject>L2SW2…<\/text><\/switch><\/g>
    L2SW3
    Priority\uff1a32768<\/div><\/div><\/div><\/foreignObject>L2SW3…<\/text><\/switch><\/g>
    L2SW4
    Priority\uff1a32768<\/div><\/div><\/div><\/foreignObject>L2SW4…<\/text><\/switch><\/g>
    DP<\/b><\/div><\/div><\/div><\/foreignObject>DP<\/text><\/switch><\/g>
    DP<\/b><\/div><\/div><\/div><\/foreignObject>DP<\/text><\/switch><\/g>
    \u30d1\u30b9\u30b3\u30b9\u30c8\uff1a4<\/div><\/div><\/div><\/foreignObject>\u30d1\u30b9\u30b3\u30b9\u30c8\uff1a4<\/text><\/switch><\/g>
    DP<\/b><\/div><\/div><\/div><\/foreignObject>DP<\/text><\/switch><\/g>
    RP<\/b><\/div><\/div><\/div><\/foreignObject>RP<\/text><\/switch><\/g>
    DP<\/b><\/div><\/div><\/div><\/foreignObject>DP<\/text><\/switch><\/g>
    RP<\/b><\/div><\/div><\/div><\/foreignObject>RP<\/text><\/switch><\/g>
    RP<\/b><\/div><\/div><\/div><\/foreignObject>RP<\/text><\/switch><\/g>
    Alt<\/b><\/div><\/div><\/div><\/foreignObject>Alt<\/text><\/switch><\/g>
    \u30d1\u30b9\u30b3\u30b9\u30c8\uff1a4<\/div><\/div><\/div><\/foreignObject>\u30d1\u30b9\u30b3\u30b9\u30c8\uff1a4<\/text><\/switch><\/g>
    \u30d1\u30b9\u30b3\u30b9\u30c8\uff1a8<\/div><\/div><\/div><\/foreignObject>\u30d1\u30b9\u30b3\u30b9\u30c8\uff1a8<\/text><\/switch><\/g><\/g>Text is not SVG – cannot display<\/text><\/a><\/switch><\/svg>\n\n\n\n
    \u3000\u4e0a\u8a18\u69cb\u6210\u3067L2SW2\u306eGi0\/1\uff08L2SW1\u5411\u3051\uff09\u306ePath Cost\u3092\u5909\u66f4\u3057\u3001L2SW2\u3068L2SW4\u306e\u30dd\u30fc\u30c8\u306e\u5f79\u5272\u304c\u5909\u66f4\u3057\u3066\u3044\u304f\u3053\u3068\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
    \u4e8b\u524d\u72b6\u614b\u306e\u78ba\u8a8d<\/h3>\n\n\n\n
    L2SW1\u306e\u72b6\u614b\u78ba\u8a8d<\/h4>\n\n\n\n
    \u3000L2SW1\u306e\u72b6\u614b\u306f\u30eb\u30fc\u30c8\u30d6\u30ea\u30c3\u30b8\u3067\u306e\u305f\u3081\u3001\u5168\u30dd\u30fc\u30c8\u304c\u3067\u6307\u5b9a\u30dd\u30fc\u30c8\uff08DP\uff09\u306b\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
    L2SW1#show spanning-tree vlan 2\n\nVLAN0002\nSpanning tree enabled protocol rstp\nRoot ID    Priority    2\nAddress     5254.0009.652d\nThis bridge is the root\nHello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec\n\nBridge ID  Priority    2      (priority 0 sys-id-ext 2)\nAddress     5254.0009.652d\nHello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec\nAging Time  300 sec\n\nInterface           Role Sts Cost      Prio.Nbr Type\n------------------- ---- --- --------- -------- --------------------------------\nGi0\/0               Desg FWD 4         128.1    P2p\nGi0\/1               Desg FWD 4         128.2    P2p<\/code><\/pre>\n\n\n\n
    L2SW2\u306e\u72b6\u614b\u78ba\u8a8d<\/h4>\n\n\n\n
    \u3000\u3053\u3053\u3067\u306fL2SW2\u306ePath Cost\u3092\u78ba\u8a8d\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
    \u7279\u306b\u5909\u66f4\u3092\u52a0\u3048\u3066\u3044\u306a\u3044\u306e\u3067\u3001\u73fe\u72b6\u3067\u306f\u300c4\u300d\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/span><\/strong><\/p>\n\n\n\n
    L2SW2#show spanning-tree vlan 2\n\nVLAN0002\n  Spanning tree enabled protocol rstp\n  Root ID    Priority    2\n             Address     5254.0009.652d\n             Cost        4\n             Port        2 (GigabitEthernet0\/1)\n             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec\n\n  Bridge ID  Priority    32770  (priority 32768 sys-id-ext 2)\n             Address     5254.0007.55ed\n             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec\n             Aging Time  300 sec\n\nInterface           Role Sts Cost      Prio.Nbr Type\n------------------- ---- --- --------- -------- --------------------------------\nGi0\/0               Desg FWD 4         128.1    P2p\nGi0\/1               Root FWD 4         128.2    P2p<\/span><\/strong><\/code><\/pre>\n\n\n\n
    L2SW4\u306e\u72b6\u614b\u78ba\u8a8d<\/h4>\n\n\n\n
    \u3000\u305d\u3057\u3066\u3001\u30dd\u30fc\u30c8\u306e\u5f79\u5272\u304c\u5909\u308f\u308bL2SW4\u306e\u4e8b\u524d\u72b6\u614b\u3082\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
    \u3053\u306e\u6642\u70b9\u3067\u306f\u3001Gi0\/0\u304c\u30eb\u30fc\u30c8\u30dd\u30fc\u30c8\uff08RP\uff09\u3001Gi0\/1\u304c\u4ee3\u66ff\u30dd\u30fc\u30c8\uff08AP\uff09\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
    \u3053\u306e\u72b6\u614b\u3092\u5909\u5316\u3055\u305b\u308b\u305f\u3081\u306bPath Cost\u306e\u5909\u66f4\u3092\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
    L2SW4#show spanning-tree vlan 2\n\nVLAN0002\nSpanning tree enabled protocol rstp\nRoot ID    Priority    2\nAddress     5254.0009.652d\nCost        8\nPort        1 (GigabitEthernet0\/0)\nHello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec\n\nBridge ID  Priority    32770  (priority 32768 sys-id-ext 2)\nAddress     5254.0001.250c\nHello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec\nAging Time  300 sec\n\nInterface           Role Sts Cost      Prio.Nbr Type\n------------------- ---- --- --------- -------- --------------------------------\nGi0\/0               Root FWD 4         128.1    P2p\nGi0\/1               Altn BLK 4         128.2    P2p<\/code><\/pre>\n\n\n\n
    \u8a2d\u5b9a\u5909\u66f4\u6642\u306e\u30aa\u30da\u30ec\u30fc\u30b7\u30e7\u30f3\u30fb\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0<\/h3>\n\n\n\n
    L2SW1\u306f\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0\u304c\u4e00\u5207\u51fa\u306a\u304b\u3063\u305f\u306e\u3067\u3001\u5272\u611b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
    \u305d\u306e\u4e0a\u3067\u3001\u6700\u521d\u306bL2SW2\u306e\u30aa\u30da\u30ec\u30fc\u30b7\u30e7\u30f3\u3068\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0\u3092\u898b\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
    L2SW2\uff08\u30aa\u30da\u30ec\u30fc\u30b7\u30e7\u30f3\u30fb\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0\u306e\u307f\uff09<\/h4>\n\n\n\n
    \u8a2d\u5b9a\u6295\u5165\u6642\u306eL2SW2\u306e\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
    L2SW2#conf t\nEnter configuration commands, one per line.  End with CNTL\/Z.\nL2SW2(config)#interface gigabitEthernet 0\/1\nL2SW2(config-if)#spanning-tree vlan 2 cost 1000\nL2SW2(config-if)#end\nL2SW2#\n*Aug  2 09:58:28.397: RSTP(2): updt roles, received superior bpdu on Gi0\/1\n*Aug  2 09:58:28.402: RSTP(2): updt roles, received superior bpdu on Gi0\/0\n*Aug  2 09:58:28.402: RSTP(2): Gi0\/0 is now root port\n*Aug  2 09:58:28.402: RSTP(2): Gi0\/1 blocked by re-root\n*Aug  2 09:58:28.402: RSTP(2): synced Gi0\/0\n*Aug  2 09:58:28.402: STP[2]: Generating TC trap for port GigabitEthernet0\/0\n*Aug  2 09:58:28.402: RSTP(2): Gi0\/1 is now alternate\n*Aug  2 09:58:28.403: RSTP(2): transmitting an agreement on Gi0\/0 as a response to a proposal\nL2SW2#<\/code><\/pre>\n\n\n\n
    \u3000\u3053\u3053\u3067\u308f\u304b\u308b\u3088\u3046\u306bIF\u30e2\u30fc\u30c9\u306b\u5165\u308a\u3001\u30b3\u30de\u30f3\u30c9\u300cspanning-tree vlan 2 cost 1000\u300d\u3092\u5165\u529b\u3059\u308b\u3053\u3068\u3067 STP\u306e\u518d\u8a08\u7b97\u304c\u8d70\u308a\u30dd\u30fc\u30c8\u306e\u5f79\u5272\u304c\u5909\u308f\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
    L2SW4\uff08\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0\u306e\u307f\uff09<\/h4>\n\n\n\n
    \u30c7\u30d0\u30c3\u30b0\u30ed\u30b0\u3092\u898b\u308b\u3068Gi0\/1\u304c\u30eb\u30fc\u30c8\u30dd\u30fc\u30c8\uff08RP\uff09\u3068\u306a\u308a\u3001Gi0\/0\u304c\u6307\u5b9a\u30dd\u30fc\u30c8\uff08DP\uff09\u306b\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
    *Aug  2 09:58:27.419: RSTP(2): updt roles, received superior bpdu on Gi0\/0\n*Aug  2 09:58:27.419: RSTP(2): Gi0\/1 is now root port\n*Aug  2 09:58:27.419: RSTP(2): Gi0\/0 blocked by re-root\n*Aug  2 09:58:27.419: RSTP(2): Gi0\/0 is now designated\n*Aug  2 09:58:27.419: STP[2]: Generating TC trap for port GigabitEthernet0\/1\n*Aug  2 09:58:27.420: RSTP(2): transmitting a proposal on Gi0\/0\n*Aug  2 09:58:27.423: RSTP(2): received an agreement on Gi0\/0\n*Aug  2 09:58:27.423: STP[2]: Generating TC trap for port GigabitEthernet0\/0<\/code><\/pre>\n\n\n\n
    \u4e8b\u5f8c\u72b6\u614b\u306e\u78ba\u8a8d<\/h3>\n\n\n\n
    \u3000\u78ba\u8a8d\u3059\u308b\u5fc5\u8981\u3082\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u6700\u5f8c\u306b\u30dd\u30fc\u30c8\u306e\u72b6\u614b\u3068\u30b3\u30b9\u30c8\u3092\u898b\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
    L2SW2<\/h4>\n\n\n\n
    \u3000\u3053\u3053\u3067\u308f\u304b\u308b\u3088\u3046\u306bGi0\/1\u306e\u30b3\u30b9\u30c8\u304c\u300c1000\u300d\u3068\u306a\u308a\u3001\u30dd\u30fc\u30c8\u306e\u5f79\u5272\u3082Gi0\/1\u304c\u4ee3\u66ff\u30dd\u30fc\u30c8\uff08AP\uff09\u306b\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
    L2SW2#show spanning-tree vlan 2\n\nVLAN0002\n  Spanning tree enabled protocol rstp\n  Root ID    Priority    2\n             Address     5254.0009.652d\n             Cost        12\n             Port        1 (GigabitEthernet0\/0)\n             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec\n\n  Bridge ID  Priority    32770  (priority 32768 sys-id-ext 2)\n             Address     5254.0007.55ed\n             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec\n             Aging Time  300 sec\n\nInterface           Role Sts Cost      Prio.Nbr Type\n------------------- ---- --- --------- -------- --------------------------------\nGi0\/0               Root FWD 4         128.1    P2p\nGi0\/1               Altn BLK 1000      128.2    P2p<\/span><\/strong><\/code><\/pre>\n\n\n\n
    L2SW4<\/h4>\n\n\n\n
    L2SW4\u3082\u540c\u69d8\u306bGi0\/1\u304c\u30eb\u30fc\u30c8\u30dd\u30fc\u30c8\uff08RP\uff09\u3001Gi0\/0\u304c\u6307\u5b9a\u30dd\u30fc\u30c8\uff08DP\uff09\u306b\u306a\u308a\u5909\u5316\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
    L2SW4#show spanning-tree vlan 2\n\nVLAN0002\n  Spanning tree enabled protocol rstp\n  Root ID    Priority    2\n             Address     5254.0009.652d\n             Cost        8\n             Port        2 (GigabitEthernet0\/1)\n             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec\n\n  Bridge ID  Priority    32770  (priority 32768 sys-id-ext 2)\n             Address     5254.0001.250c\n             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec\n             Aging Time  300 sec\n\nInterface           Role Sts Cost      Prio.Nbr Type\n------------------- ---- --- --------- -------- --------------------------------\nGi0\/0               Desg FWD 4         128.1    P2p\nGi0\/1               Root FWD 4         128.2    P2p<\/span><\/strong><\/code><\/pre>\n\n\n\n
    \u6700\u5f8c\u306b<\/h2>\n\n\n\n
    \u3000\u4eca\u56de\u78ba\u8a8d\u3057\u305f\u3053\u3068\u306f\u3001STP\u306ePriority\u5909\u66f4\u3068Path Cost\u306e\u5909\u66f4\u3067\u3059\u3002<\/p>\n\n\n\n
    \u3042\u307e\u308a\u8fc2\u56de\u7b49\u3059\u308b\u3053\u3068\u306f\u306a\u3044\u3067\u3059\u304c\u3001\u305f\u307e\u306b\u4f7f\u3046\u3053\u3068\u3082\u3042\u308b\u3068\u601d\u3046\u306e\u3067\u5fa9\u7fd2\u3057\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n\n\n\n
    \u8a18\u4e8b\u4e00\u89a7<\/h2>\n\n\n