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:
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1 |
Router# </code><strong class="cBold">show spanning-tree</strong> |
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<br /> |
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VLAN0001 |
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1 |
Spanning tree enabled protocol ieee |
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1 |
Root ID Priority 4097 |
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1 |
Address 0004.9b78.0800 |
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1 |
This bridge is the root |
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1 |
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec |
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1 |
<br /> |
|
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Bridge ID Priority 4097 (priority 4096 sys-id-ext 1) |
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1 |
Address 0004.9b78.0800 |
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Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec |
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Aging Time 15 |
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1 |
<br /> |
|
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Interface Port ID Designated Port ID |
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Name Prio.Nbr Cost Sts Cost Bridge ID Prio.Nbr |
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---------------- -------- --------- --- --------- -------------------- -------- |
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Gi2/1 128.65 4 LIS 0 4097 0004.9b78.0800 128.65 |
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Gi2/2 128.66 4 LIS 0 4097 0004.9b78.0800 128.66 |
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Fa4/3 128.195 19 LIS 0 4097 0004.9b78.0800 128.195 |
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Fa4/4 128.196 19 BLK 0 4097 0004.9b78.0800 128.195 |
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<br /> |
|
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Router# |
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<br /> |
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:
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Router# </code><strong class="cBold">show spanning-tree active</strong> |
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UplinkFast is disabled |
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1 |
BackboneFast is disabled |
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1 |
<br /> |
|
1 |
VLAN1 is executing the ieee compatible Spanning Tree protocol |
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1 |
Bridge Identifier has priority 32768, address 0050.3e8d.6401 |
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1 |
Configured hello time 2, max age 20, forward delay 15 |
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1 |
Current root has priority 16384, address 0060.704c.7000 |
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1 |
Root port is 265 (FastEthernet5/9), cost of root path is 38 |
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1 |
Topology change flag not set, detected flag not set |
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1 |
Number of topology changes 0 last change occurred 18:13:54 ago |
|
1 |
Times: hold 1, topology change 24, notification 2 |
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hello 2, max age 14, forward delay 10 |
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Timers: hello 0, topology change 0, notification 0 |
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<br /> |
|
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Port 265 (FastEthernet5/9) of VLAN1 is forwarding |
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Port path cost 19, Port priority 128, Port Identifier 129.9. |
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Designated root has priority 16384, address 0060.704c.7000 |
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Designated bridge has priority 32768, address 00e0.4fac.b000 |
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. |
|
1 |
. |
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. |
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Router# |
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<br /> |
This example shows how to display spanning tree BackboneFast status:
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Router# <strong class="cBold">show spanning-tree backbonefast</strong> |
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BackboneFast is enabled |
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1 |
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BackboneFast statistics |
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----------------------- |
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Number of transition via backboneFast (all VLANs) : 0 |
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Number of inferior BPDUs received (all VLANs) : 0 |
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Number of RLQ request PDUs received (all VLANs) : 0 |
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Number of RLQ response PDUs received (all VLANs) : 0 |
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Number of RLQ request PDUs sent (all VLANs) : 0 |
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Number of RLQ response PDUs sent (all VLANs) : 0 |
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Router# |
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<br /> |
This example shows how to display spanning tree information for this bridge only:
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Router# <strong class="cBold">show spanning-tree bridge</strong> |
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VLAN1 |
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Bridge ID Priority 32768 |
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Address 0050.3e8d.6401 |
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Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec |
|
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VLAN2 |
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Bridge ID Priority 32768 |
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1 |
Address 0050.3e8d.6402 |
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Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec |
|
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VLAN3 |
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Bridge ID Priority 32768 |
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1 |
Address 0050.3e8d.6403 |
|
1 2 3 4 |
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec |
|
1 |
. |
|
1 |
. |
|
1 |
. |
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Router# |
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<br /> |
This example shows how to display detailed interface information:
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Router# </code><strong class="cBold">show spanning-tree detail</strong> |
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<br /> |
|
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VLAN1 is executing the ieee compatible Spanning Tree protocol |
|
1 |
Bridge Identifier has priority 4096, address 00d0.00b8.1401 |
|
1 |
Configured hello time 2, max age 20, forward delay 15 |
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We are the root of the spanning tree |
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1 |
Topology change flag not set, detected flag not set |
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1 |
Number of topology changes 9 last change occurred 02:41:34 ago |
|
1 |
from FastEthernet4/21 |
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1 |
Times: hold 1, topology change 35, notification 2 |
|
1 |
hello 2, max age 20, forward delay 15 |
|
1 |
Timers: hello 1, topology change 0, notification 0, aging 300 |
|
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<br /> |
|
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Port 213 (FastEthernet4/21) of VLAN1 is forwarding |
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Port path cost 19, Port priority 128, Port Identifier 128.213. |
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Designated root has priority 4096, address 00d0.00b8.1401 |
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1 |
Designated bridge has priority 4096, address 00d0.00b8.1401 |
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1 |
Designated port id is 128.213, designated path cost 0 |
|
1 |
Timers: message age 0, forward delay 0, hold 0 |
|
1 |
Number of transitions to forwarding state: 1 |
|
1 |
BPDU: sent 4845, received 1 |
|
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<br /> |
|
1 |
Port 214 (FastEthernet4/22) of VLAN1 is forwarding |
|
1 |
Port path cost 19, Port priority 128, Port Identifier 128.214. |
|
1 |
Designated root has priority 4096, address 00d0.00b8.1401 |
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1 |
Designated bridge has priority 4096, address 00d0.00b8.1401 |
|
1 |
Designated port id is 128.214, designated path cost 0 |
|
1 |
Timers: message age 0, forward delay 0, hold 0 |
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1 |
Number of transitions to forwarding state: 1 |
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BPDU: sent 127545, received 5 |
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Router# |
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<br /> |
This example shows how to display spanning tree information for a specific interface:
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Router# <strong class="cBold">show spanning-tree interface fastethernet 5/9</strong> |
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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 . |
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. |
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1 |
. |
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<br /> |
This example shows how to display spanning tree information for a specific VLAN:
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Router# </code><strong class="cBold">show spanning-tree vlan 200</strong> |
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1 |
VLAN0200 |
|
1 |
Spanning tree enabled protocol ieee |
|
1 |
Root ID Priority 32768 |
|
1 |
Address 00d0.00b8.14c8 |
|
1 |
This bridge is the root |
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1 |
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec |
|
1 |
Bridge ID Priority 32768 |
|
1 |
Address 00d0.00b8.14c8 |
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1 |
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec |
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1 |
Aging Time 300 |
|
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Interface Role Sts Cost Prio.Nbr Status |
|
1 |
---------------- ---- --- --------- -------- -------------------------------- |
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Fa4/4 Desg FWD 200000 128.196 P2p |
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Fa4/5 Back BLK 200000 128.197 P2p |
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Router# |
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<br /> |
This example shows how to display spanning tree information for a specific bridge group:
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Router# </code><strong class="cBold">show spanning-tree 1</strong> |
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1 |
UplinkFast is disabled |
|
1 |
BackboneFast is disabled |
|
1 |
|
1 |
Bridge group 1 is executing the ieee compatible Spanning Tree protocol |
|
1 |
Bridge Identifier has priority 32768, address 00d0.d39c.004d |
|
1 |
Configured hello time 2, max age 20, forward delay 15 |
|
1 |
Current root has priority 32768, address 00d0.d39b.fddd |
|
1 2 |
Root port is 7 (FastEthernet2/ 2), cost of root path is 19 |
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1 |
Topology change flag set, detected flag not set |
|
1 |
Number of topology changes 3 last change occurred 00:00:01 ago |
|
1 |
from FastEthernet2/2 |
|
1 |
Times: hold 1, topology change 35, notification 2 |
|
1 |
hello 2, max age 20, forward delay 15 |
|
1 |
Timers: hello 0, topology change 0, notification 0 bridge aging time 15 |
|
1 |
|
1 |
Port 2 (Ethernet0/1/0) of Bridge group 1 is down |
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1 |
|
1 |
Port path cost 100, Port priority 128 |
|
1 |
Designated root has priority 32768, address 0050.0bab.1808 |
|
1 |
Designated bridge has priority 32768, address 0050.0bab.1808 |
|
1 |
Designated port is 2, path cost 0 |
|
1 |
Timers: message age 0, forward delay 0, hold 0 |
|
1 |
BPDU: sent 0, received 0 |
|
1 |
|
1 |
Port 7 (FastEthernet2/2) of Bridge group 1 is forwarding |
|
1 |
Port path cost 19, Port priority 128, Port Identifier 128.7. |
|
1 |
Designated root has priority 32768, address 00d0.d39b.fddd |
|
1 |
Designated bridge has priority 32768, address 00d0.d39b.fddd |
|
1 |
Designated port id is 128.7, designated path cost 0 |
|
1 |
Timers: message age 2, forward delay 0, hold 0 |
|
1 |
Number of transitions to forwarding state: 1 |
|
1 |
BPDU: sent 3, received 49 |
|
1 |
Router# |
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<br /> |
This example shows how to display a summary of port states:
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1 |
Router# </code><strong class="cBold" style="FONT-WEIGHT: bold">show spanning-tree summary</strong><span style="FONT-WEIGHT: normal; FONT-STYLE: normal"> </span> |
|
1 |
Root bridge for: Bridge group 1, VLAN0001, VLAN0004-VLAN1005 |
|
1 |
VLAN1013-VLAN1499, VLAN2001-VLAN4094 |
|
1 |
EtherChannel misconfiguration guard is enabled |
|
1 |
Extended system ID is enabled |
|
1 |
Portfast is enabled by default |
|
1 |
PortFast BPDU Guard is disabled by default |
|
1 |
Portfast BPDU Filter is disabled by default |
|
1 |
Loopguard is disabled by default |
|
1 |
UplinkFast is disabled |
|
1 |
BackboneFast is disabled |
|
1 |
Pathcost method used is long |
|
1 |
Name Blocking Listening Learning Forwarding STP Active |
|
1 |
---------------------- -------- --------- -------- ---------- ---------- |
|
1 |
1 bridge 0 0 0 1 1 |
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1 |
3584 vlans 3584 0 0 7168 10752 |
|
1 |
Blocking Listening Learning Forwarding STP Active |
|
1 |
---------------------- -------- --------- -------- ---------- ---------- |
|
1 |
Total 3584 0 0 7169 10753 |
|
1 |
Router# |
|
1 |
<br /> |
This example shows how to display the total lines of the spanning tree state section:
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1 |
Router# </code><strong class="cBold">show spanning-tree summary total </strong> |
|
1 |
Root bridge for:Bridge group 10, VLAN1, VLAN6, VLAN1000. |
|
1 |
Extended system ID is enabled. |
|
1 |
PortFast BPDU Guard is disabled |
|
1 |
EtherChannel misconfiguration guard is enabled |
|
1 |
UplinkFast is disabled |
|
1 |
BackboneFast is disabled |
|
1 |
Default pathcost method used is long |
|
1 |
<br /> |
|
1 |
Name Blocking Listening Learning Forwarding STP Active |
|
1 |
-------------------- -------- --------- -------- ---------- ---------- |
|
1 |
105 VLANs 3433 0 0 105 3538 |
|
1 |
|
1 |
BackboneFast statistics |
|
1 |
----------------------- |
|
1 |
Number of transition via backboneFast (all VLANs) :0 |
|
1 |
Number of inferior BPDUs received (all VLANs) :0 |
|
1 |
Number of RLQ request PDUs received (all VLANs) :0 |
|
1 |
Number of RLQ response PDUs received (all VLANs) :0 |
|
1 |
Number of RLQ request PDUs sent (all VLANs) :0 |
|
1 |
Number of RLQ response PDUs sent (all VLANs) :0 |
|
1 |
Router# |
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1 |
<br /> |
This example shows how to determine if any ports are in root inconsistent state:
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1 |
Router# </code><strong class="cBold">show spanning-tree inconsistentports </strong> |
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1 |
Name Interface Inconsistency |
|
1 |
-------------------- -------------------- ------------------ |
|
1 |
VLAN1 FastEthernet3/1 Root Inconsistent |
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1 |
<br /> |
|
1 |
Number of inconsistent ports (segments) in the system :1 |
|
1 |
Router# |
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