Dell S4048-ON, Configuration Manual

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protocol spanning-tree 0
2. Enable STP.
PROTOCOL SPANNING TREE mode
no disable
Examples of Verifying Spanning Tree Information
To disable STP globally for all Layer 2 interfaces, use the
disable
command from PROTOCOL SPANNING TREE mode.
To verify that STP is enabled, use the
show config
command from PROTOCOL SPANNING TREE mode.
Dell(conf)#protocol spanning-tree 0
Dell(config-span)#show config
!
protocol spanning-tree 0
no disable
Dell#
To view the spanning tree configuration and the interfaces that are participating in STP, use the
show spanning-tree 0
command from EXEC privilege mode. If a physical interface is part of a port channel, only the port channel is listed in the command
output.
R2#show spanning-tree 0
Executing IEEE compatible Spanning Tree Protocol
Bridge Identifier has priority 32768, address 0001.e826.ddb7
Configured hello time 2, max age 20, forward delay 15
Current root has priority 32768, address 0001.e80d.2462
Root Port is 289 (TenGigabitEthernet 2/1), cost of root path is 4
Topology change flag not set, detected flag not set
Number of topology changes 3 last change occurred 0:16:11 ago
from TenGigabitEthernet 2/3
Timers: hold 1, topology change 35
hello 2, max age 20, forward delay 15
Times: hello 0, topology change 0, notification 0, aging Normal
Port 289 (TenGigabitEthernet 2/1) is Forwarding
Port path cost 4, Port priority 8, Port Identifier 8.289
Designated root has priority 32768, address 0001.e80d.2462
Designated bridge has priority 32768, address 0001.e80d.2462
Designated port id is 8.496, designated path cost 0
Timers: message age 1, forward delay 0, hold 0
Number of transitions to forwarding state 1
BPDU: sent 21, received 486
The port is not in the portfast mode
Port 290 (TenGigabitEthernet 2/2) is Blocking
Port path cost 4, Port priority 8, Port Identifier 8.290
--More--
Timers: message age 1, forward delay 0, hold 0
Number of transitions to forwarding state 1
BPDU: sent 21, received 486
The port is not in the portfast mode
To confirm that a port is participating in Spanning Tree, use the
show spanning-tree 0 brief
command from EXEC privilege
mode.
Dell#show spanning-tree 0 brief
Executing IEEE compatible Spanning Tree Protocol
Root ID Priority 32768, Address 0001.e80d.2462
We are the root of the spanning tree
Root Bridge hello time 2, max age 20, forward delay 15
Bridge ID Priority 32768, Address 0001.e80d.2462
Configured hello time 2, max age 20, forward delay 15
Interface Designated
Name PortID Prio Cost Sts Cost Bridge ID PortID
-------------- ------ ---- ---- --- ----- --------------------
Spanning Tree Protocol (STP)
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