Spanning Tree 902.1d (PVST)

 Priority 을 이용해 Root Bridge, Root Port, Altn Port, Desg Port 를 수정 가능하다.

셋팅

HQ_SE_3F_SW1(config)#spanning-tree vlan 10 priority 4096

HQ_SE_3F_SW1(config)#spanning-tree vlan 20 priority 8192 

HQ_SE_3F_SW2(config)#spanning-tree vlan 20 priority 4096

HQ_SE_3F_SW2(config)#spanning-tree vlan 10 priority 8192

HQ_SE_3F_SW3#show spanning-tree vlan 10

VLAN0010

Spanning tree enabled protocol ieee

Root ID Priority 4106

Address 0090.0C5E.97D3

Cost 38

Port 1(FastEthernet0/1)

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32778 (priority 32768 sys-id-ext 10)

Address 000B.BEB0.C1DB

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 20

Interface Role Sts Cost Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Fa0/1 Root FWD 19 128.1 P2p

Fa0/2 Altn BLK 19 128.2 P2p

HQ_SE_3F_SW4#show spanning-tree vlan 20

VLAN0020

Spanning tree enabled protocol ieee

Root ID Priority 4116

Address 0010.11DA.A531

Cost 38

Port 1(FastEthernet0/1)

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32788 (priority 32768 sys-id-ext 20)

Address 0030.F2D6.6C80

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 20

Interface Role Sts Cost Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Fa0/1 Root FWD 19 128.1 P2p

Fa0/2 Altn BLK 19 128.2 P2p