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Re: ルートパスコストの計算について

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msg# 1.3.1
depth:
2
前の投稿 - 次の投稿 | 親投稿 - 子投稿.1 | 投稿日時 2018-3-1 17:38
arashi1977  長老 居住地: 広島  投稿数: 1715
引用：
外部サイトで申し訳ないですが、今持っている参考書の写真です。
（略）
この写真におけるAB間のリンクは、SWBのfa0/1が指定ポートになり、
SWAのfa0/1が非指定と参考書では記載しています。

私の環境では、Pnt266_005 さんがお持ちの参考書と違う結果になるようです。どちらが正しいんでしょうね？ 
SwitchA#show cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
                  S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
                  D - Remote, C - CVTA, M - Two-port Mac Relay

Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID
SwitchB          Gig 0/1           167             R S I            Gig 0/1
SwitchD          Gig 0/3           175             R S I            Gig 0/3

Total cdp entries displayed : 2
SwitchA#show spanning-tree

VLAN0001
  Spanning tree enabled protocol rstp
  Root ID    Priority    4097
             Address     0000.00dd.dddd
             Cost        19
             Port        4 (GigabitEthernet0/3)
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)
             Address     0000.00aa.aaaa
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  300 sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi0/1               Desg FWD 19        128.2    P2p ←ここ
Gi0/3               Root FWD 19        128.4    P2p


SwitchB#show cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
                  S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
                  D - Remote, C - CVTA, M - Two-port Mac Relay

Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID
SwitchC          Gig 0/3           163             R S I            Gig 0/3
SwitchA          Gig 0/1           165             R S I            Gig 0/1

Total cdp entries displayed : 2
SwitchB#show spanning-tree

VLAN0001
  Spanning tree enabled protocol rstp
  Root ID    Priority    4097
             Address     0000.00dd.dddd
             Cost        38
             Port        4 (GigabitEthernet0/3)
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)
             Address     0000.00bb.bbbb
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  300 sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi0/1               Altn BLK 19        128.2    P2p ←ここ
Gi0/3               Root FWD 19        128.4    P2p


SwitchC#show cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
                  S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
                  D - Remote, C - CVTA, M - Two-port Mac Relay

Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID
SwitchB          Gig 0/3           166             R S I            Gig 0/3
SwitchD          Gig 0/1           124             R S I            Gig 0/1

Total cdp entries displayed : 2
SwitchC#show spanning-tree

VLAN0001
  Spanning tree enabled protocol rstp
  Root ID    Priority    4097
             Address     0000.00dd.dddd
             Cost        19
             Port        2 (GigabitEthernet0/1)
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    8193   (priority 8192 sys-id-ext 1)
             Address     0000.00cc.cccc
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  300 sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi0/1               Root FWD 19        128.2    P2p
Gi0/3               Desg FWD 19        128.4    P2p


SwitchD#show cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
                  S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
                  D - Remote, C - CVTA, M - Two-port Mac Relay

Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID
SwitchC          Gig 0/1           159             R S I            Gig 0/1
SwitchA          Gig 0/3           164             R S I            Gig 0/3

Total cdp entries displayed : 2
SwitchD#show spanning-tree

VLAN0001
  Spanning tree enabled protocol rstp
  Root ID    Priority    4097
             Address     0000.00dd.dddd
             This bridge is the root
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    4097   (priority 4096 sys-id-ext 1)
             Address     0000.00dd.dddd
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  300 sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi0/1               Desg FWD 19        128.2    P2p
Gi0/3               Desg FWD 19        128.4    P2p

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