Spanning Tree Protocol (STP)

You are the Network Administrator of Ranet, and
would like:
    – Ranet-CoreSW to be the Root Bridge
    – Port Fa0/2 of Ranet-SW2 to be in the blocking state
Please config spanning-tree parameter on both
Ranet-CoreSW and Ranet-SW2 via its console to be
as the requirement above.

Remark: Use command to set priority as lowest/highest
as possible to gain the point (%Completion) for this
question.

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Solution

 Ranet Core-SW:

Ranet-CoreSW>en
Ranet-CoreSW#sh spanning-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 32769
Address 0002.4A0B.19DB
Cost 4
Port 26(GigabitEthernet0/2)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 0090.216A.C001
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20
Interface Role Sts Cost Prio.Nbr Type
—————- —- — ——— ——– ——————————–
Gi0/1 Desg FWD 4 128.25 P2p
Gi0/2 Root FWD 4 128.26 P2p
Ranet-CoreSW#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Ranet-CoreSW(config)#spanning-tree vlan 1 root primary
Ranet-CoreSW(config)#
Ranet-CoreSW#
%SYS-5-CONFIG_I: Configured from console by console
Ranet-CoreSW#sh spanning-tree
VLAN0001 2
Spanning tree enabled protocol ieee
Root ID Priority 24577
Address 0090.216A.C001
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 0090.216A.C001
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20
Interface Role Sts Cost Prio.Nbr Type
—————- —- — ——— ——– ——————————–
Gi0/1 Desg FWD 4 128.25 P2p
Gi0/2 Altn BLK 4 128.26 P2p
Ranet-CoreSW#copy run start
Destination filename [startup-config]?
Building configuration…
[OK]
Ranet-CoreSW#

 Ranet SW3 :

Ranet-SW3>en
Ranet-SW3#sh spanning-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 24577
Address 0090.216A.C001
Cost 4
Port 25(GigabitEthernet1/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 0002.4A0B.19DB
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20
Interface Role Sts Cost Prio.Nbr Type
—————- —- — ——— ——– ——————————–
Gi1/1 Root FWD 4 128.25 P2p
Fa0/1 Desg FWD 19 128.1 P2p
Ranet-SW3#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Ranet-SW3(config)#spanning-tree vlan 1 priority ?
bridge priority in increments of 4096
Ranet-SW3(config)#spanning-tree vlan 1 priority 61440
Ranet-SW3(config)#
Ranet-SW3#
%SYS-5-CONFIG_I: Configured from console by console
Ranet-SW3#sh spanning-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 24577
Address 0090.216A.C001
Cost 4
Port 25(GigabitEthernet1/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 61441 (priority 61440 sys-id-ext 1)
Address 0002.4A0B.19DB
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20
Interface Role Sts Cost Prio.Nbr Type
—————- —- — ——— ——– ——————————–
Gi1/1 Root FWD 4 128.25 P2p
Fa0/1 Desg FWD 19 128.1 P2p
Ranet-SW3#copy run start
Destination filename [startup-config]?
Building configuration…
[OK]
Ranet-SW3#

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