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Re: ﾙｰﾄﾊﾟｽｺｽﾄの計算について

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最強WEB問題集CCNA

投稿ﾕｰｻﾞ(投稿日)

(2018/2/27)

本文

-----引用(始)-----

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が指定ﾎﾟｰﾄになり､
SWAのfa0/1が非指定と参考書では記載しています｡

-----引用(終)-----

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? huh
[code]
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
[/code]

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