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12. STP –Change The Root Bridge In The Network.

12.   STP –Change The Root Bridge In The Network.









Switch#config t
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#spanning-tree mode pvst
Switch(config)#spanning-tree vlan1 priority 2323

Switch>show spanning-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 24577
Address 00E0.8F9B.6675
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 24577 (priority 24576 sys-id-ext 1)
Address 00E0.8F9B.6675
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20

Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/1 Desg FWD 19 128.1 P2p
Fa0/2 Desg FWD 19 128.2 P2p
Fa0/3 Desg FWD 19 128.3 P2p
Fa0/4 Desg FWD 19 128.4 P2p
Fa0/5 Desg FWD 19 128.5 P2p

Switch>show spanning-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 24577
Address 00E0.8F9B.6675
Cost 19
Port 1(FastEthernet0/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 0030.A3C4.0714
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20

Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/3AltnBLK 19 128.3 P2p
Fa0/2 Desg FWD 19 128.2 P2p
Fa0/1 RootFWD 19 128.1 P2p
Fa0/4 AltnBLK 19 128.4 P2p

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