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Catalyst 6500 Series Cisco IOS Command Reference, 12.1 E
show spanning-tree
To display information about the spanning tree state, use the show spanning-tree command.
show spanning-tree [bridge-group | active | backbonefast | {bridge [id]}| detail | inconsistentports | {interface interface interface-number} | root | summary [total] | uplinkfast | {vlan vlan-id} | {port-channel number} | pathcost-method]
Syntax Description
Defaults
This command has no default settings.
Command Modes
Priviledged EXEC
Command History
Usage Guidelines
The interface-number argument designates the module and port number. Valid values for interface-number depend on the specified interface type and the chassis and module used. For example, if you specify a Gigabit Ethernet interface and have a 48-port 10/100BASE-T Ethernet module installed in a 13-slot chassis, valid values for the module number are from 2 to 13 and valid values for the port number are from 1 to 48.
The number of valid values for port-channel num depends on the software release. For releases prior to Release 12.1(3a)E3, valid values are from 1 to 256; for Releases 12.1(3a)E3, 12.1(3a)E4, and 12.1(4)E1, valid values are from 1 to 64. Release 12.1(5c)EX and later support a maximum of 64 values ranging from 1 to 256. Release 12.1(13)E and later support a maximum of 64 values ranging from 1 to 282; values 257 to 282 are supported on the CSM and FWSM.
If your system is configured with a Supervisor Engine 1, valid values for vlan-id are from 1 to 1005. If your system is configured with a Supervisor Engine 2, valid values for vlan-id are from 1 to 4094. Extended-range VLANs are not supported on systems configured with a Supervisor Engine 1.
When checking spanning tree active states and you have a large number of VLANs, you can enter the show spanning-tree summary total command to display the total number without having to scroll through the list of VLANs.
Examples
This example shows how to display a summary of interface information:
Router# show spanning-treeVLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 4097
Address 0004.9b78.0800
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 0004.9b78.0800
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 15
Interface Port ID Designated Port ID
Name Prio.Nbr Cost Sts Cost Bridge ID Prio.Nbr
---------------- -------- --------- --- --------- -------------------- --------
Gi2/1 128.65 4 LIS 0 4097 0004.9b78.0800 128.65
Gi2/2 128.66 4 LIS 0 4097 0004.9b78.0800 128.66
Fa4/3 128.195 19 LIS 0 4097 0004.9b78.0800 128.195
Fa4/4 128.196 19 BLK 0 4097 0004.9b78.0800 128.195
Router#
Table 2-40 lists the output fields and definitions.
|
Field
|
Definition
|
|---|---|
|
Port ID Prio.Nbr |
Port ID and priority number. |
|
Cost |
Port cost. |
|
Sts |
Displays status information. |
This example shows how to display spanning tree information on active interfaces only:
Router# show spanning-tree activeUplinkFast is disabledBackboneFast is disabled VLAN1 is executing the ieee compatible Spanning Tree protocol Bridge Identifier has priority 32768, address 0050.3e8d.6401 Configured hello time 2, max age 20, forward delay 15 Current root has priority 16384, address 0060.704c.7000 Root port is 265 (FastEthernet5/9), cost of root path is 38 Topology change flag not set, detected flag not set Number of topology changes 0 last change occurred 18:13:54 ago Times: hold 1, topology change 24, notification 2 hello 2, max age 14, forward delay 10 Timers: hello 0, topology change 0, notification 0 Port 265 (FastEthernet5/9) of VLAN1 is forwarding Port path cost 19, Port priority 128, Port Identifier 129.9. Designated root has priority 16384, address 0060.704c.7000 Designated bridge has priority 32768, address 00e0.4fac.b000...
Router#
This example shows how to display spanning tree BackboneFast status:
Router# show spanning-tree backbonefast
BackboneFast is enabled
BackboneFast statistics-----------------------Number of transition via backboneFast (all VLANs) : 0Number of inferior BPDUs received (all VLANs) : 0Number of RLQ request PDUs received (all VLANs) : 0Number of RLQ response PDUs received (all VLANs) : 0Number of RLQ request PDUs sent (all VLANs) : 0Number of RLQ response PDUs sent (all VLANs) : 0Router# This example shows how to display spanning tree information for this bridge only:
Router# show spanning-tree bridge
VLAN1
Bridge ID Priority 32768
Address 0050.3e8d.6401
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
VLAN2
Bridge ID Priority 32768
Address 0050.3e8d.6402
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
VLAN3
Bridge ID Priority 32768
Address 0050.3e8d.6403
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
...
Router#
This example shows how to display detailed interface information:
Router# show spanning-tree detailVLAN1 is executing the ieee compatible Spanning Tree protocol
Bridge Identifier has priority 4096, address 00d0.00b8.1401
Configured hello time 2, max age 20, forward delay 15
We are the root of the spanning tree
Topology change flag not set, detected flag not set
Number of topology changes 9 last change occurred 02:41:34 ago
from FastEthernet4/21
Times: hold 1, topology change 35, notification 2
hello 2, max age 20, forward delay 15
Timers: hello 1, topology change 0, notification 0, aging 300
Port 213 (FastEthernet4/21) of VLAN1 is forwarding
Port path cost 19, Port priority 128, Port Identifier 128.213.
Designated root has priority 4096, address 00d0.00b8.1401
Designated bridge has priority 4096, address 00d0.00b8.1401
Designated port id is 128.213, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
BPDU: sent 4845, received 1
Port 214 (FastEthernet4/22) of VLAN1 is forwarding
Port path cost 19, Port priority 128, Port Identifier 128.214.
Designated root has priority 4096, address 00d0.00b8.1401
Designated bridge has priority 4096, address 00d0.00b8.1401
Designated port id is 128.214, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
BPDU: sent 127545, received 5
Router# This example shows how to display spanning tree information for a specific interface:
Router# show spanning-tree interface fastethernet 5/9
Interface Fa0/10 (port 23) in Spanning tree 1 is ROOT-INCONSISTENT Port path cost 100, Port priority 128 Designated root has priority 8192, address 0090.0c71.a400 Designated bridge has priority 32768, address 00e0.1e9f.8940 Designated port is 23, path cost 115 .
.
.
This example shows how to display spanning tree information for a specific VLAN:
Router# show spanning-tree vlan 200VLAN0200
Spanning tree enabled protocol ieee
Root ID Priority 32768
Address 00d0.00b8.14c8
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32768
Address 00d0.00b8.14c8
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Interface Role Sts Cost Prio.Nbr Status
---------------- ---- --- --------- -------- --------------------------------
Fa4/4 Desg FWD 200000 128.196 P2p
Fa4/5 Back BLK 200000 128.197 P2p
Router#
This example shows how to display spanning tree information for a specific bridge group:
Router# show spanning-tree 1 UplinkFast is disabled BackboneFast is disabled Bridge group 1 is executing the ieee compatible Spanning Tree protocol Bridge Identifier has priority 32768, address 00d0.d39c.004d Configured hello time 2, max age 20, forward delay 15 Current root has priority 32768, address 00d0.d39b.fddd Root port is 7 (FastEthernet2/
2), cost of root path is 19 Topology change flag set, detected flag not set Number of topology changes 3 last change occurred 00:00:01 ago from FastEthernet2/2 Times: hold 1, topology change 35, notification 2 hello 2, max age 20, forward delay 15 Timers: hello 0, topology change 0, notification 0 bridge aging time 15 Port 2 (Ethernet0/1/0) of Bridge group 1 is down Port path cost 100, Port priority 128 Designated root has priority 32768, address 0050.0bab.1808 Designated bridge has priority 32768, address 0050.0bab.1808 Designated port is 2, path cost 0 Timers: message age 0, forward delay 0, hold 0 BPDU: sent 0, received 0 Port 7 (FastEthernet2/2) of Bridge group 1 is forwarding Port path cost 19, Port priority 128, Port Identifier 128.7. Designated root has priority 32768, address 00d0.d39b.fddd Designated bridge has priority 32768, address 00d0.d39b.fddd Designated port id is 128.7, designated path cost 0 Timers: message age 2, forward delay 0, hold 0 Number of transitions to forwarding state: 1 BPDU: sent 3, received 49 Router# This example shows how to display a summary of port states:
Router# show spanning-tree summary Root bridge for: Bridge group 1, VLAN0001, VLAN0004-VLAN1005
VLAN1013-VLAN1499, VLAN2001-VLAN4094
EtherChannel misconfiguration guard is enabled
Extended system ID is enabled
Portfast is enabled by default
PortFast BPDU Guard is disabled by default
Portfast BPDU Filter is disabled by default
Loopguard is disabled by default
UplinkFast is disabled
BackboneFast is disabled
Pathcost method used is long
Name Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
1 bridge 0 0 0 1 1
3584 vlans 3584 0 0 7168 10752
Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
Total 3584 0 0 7169 10753
Router# This example shows how to display the total lines of the spanning tree state section:
Router# show spanning-tree summary total Root bridge for:Bridge group 10, VLAN1, VLAN6, VLAN1000.
Extended system ID is enabled.
PortFast BPDU Guard is disabled
EtherChannel misconfiguration guard is enabled
UplinkFast is disabled
BackboneFast is disabled
Default pathcost method used is long
Name Blocking Listening Learning Forwarding STP Active-------------------- -------- --------- -------- ---------- ---------- 105 VLANs 3433 0 0 105 3538 BackboneFast statistics-----------------------Number of transition via backboneFast (all VLANs) :0Number of inferior BPDUs received (all VLANs) :0Number of RLQ request PDUs received (all VLANs) :0Number of RLQ response PDUs received (all VLANs) :0Number of RLQ request PDUs sent (all VLANs) :0Number of RLQ response PDUs sent (all VLANs) :0Router# This example shows how to determine if any ports are in root inconsistent state:
Router# show spanning-tree inconsistentports Name Interface Inconsistency
-------------------- -------------------- ------------------
VLAN1 FastEthernet3/1 Root Inconsistent
Number of inconsistent ports (segments) in the system :1
Router# 
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