Displaying STP Information
How to display STP information in various
modes.
You can display STP information in various modes using the various show
commands from privileged EXEC mode.
The following example displays the STP protection configuration for all the ports on the device.
device# show stp-protect-ports Port ID BPDU Drop Count 1/1/3 478 1/1/5 213 1/1/6 0 1/1/12 31
The following example displays the STP protection configuration for a specific port.
device# show stp-protect-ports ethernet 1/1/3 STP-protect is enabled on port 1/1/3. BPDU drop count is 478
The following example displays the STP Protection configuration for a LAG port.
device# show stp-protect-ports lag 45 STP-protect is enabled on port lg45. BPDU drop count is 5
The following example displays the STP information for an entire device.
device# show span
VLAN 1 BPDU cam_index is 3 and the Master DMA Are(HEX)
STP instance owned by VLAN 1
Global STP (IEEE 802.1D) Parameters:
VLAN Root Root Root Prio Max He- Ho- Fwd Last Chg Bridge
ID ID Cost Port rity Age llo ld dly Chang cnt Address
Hex sec sec sec sec sec
1 800000e0804d4a00 0 Root 8000 20 2 1 15 689 1
00e0804d4a00
Port STP Parameters:
Port Prio Path State Fwd Design Designated Designated
Num rity Cost Trans Cost Root Bridge
Hex
1/1/1 80 19 FORWARDING 1 0 800000e0804d4a00 800000e0804d4a00
1/1/2 80 0 DISABLED 0 0 0000000000000000 0000000000000000
1/1/3 80 0 DISABLED 0 0 0000000000000000 0000000000000000
1/1/4 80 0 DISABLED 0 0 0000000000000000 0000000000000000
1/1/5 80 19 FORWARDING 1 0 800000e0804d4a00 800000e0804d4a00
1/1/6 80 19 BLOCKING 0 0 800000e0804d4a00 800000e0804d4a00
1/1/7 80 0 DISABLED 0 0 0000000000000000 0000000000000000
<lines for remaining ports excluded for brevity>The following example shows the detailed STP information.
device# show span vlan 100 STP instance owned by VLAN 100 Global STP (IEEE 802.1D) Parameters: VLAN Root Root Root Prio Max He- Ho- Fwd Last Chg Bridge ID ID Cost Port rity Age llo ld dly Chang cnt Address Hex sec sec sec sec sec 100 8000cc4e24b46fcc 0 Root 8000 20 2 1 15 11 1 cc4e24b46fcc Port STP Parameters: Port Prio Path State Fwd Design Designated Designated Num rity Cost Trans Cost Root Bridge Hex 1/1/1 80 4 FORWARDING 1 0 8000cc4e24b46fcc 8000cc4e24b46fcc 1/1/2 80 4 FORWARDING 1 0 8000cc4e24b46fcc 8000cc4e24b46fcc 1/1/3 80 4 FORWARDING 1 0 8000cc4e24b46fcc 8000cc4e24b46fcc 1/1/4 80 4 FORWARDING 1 0 8000cc4e24b46fcc 8000cc4e24b46fcc 1/1/5 80 4 FORWARDING 1 0 8000cc4e24b46fcc 8000cc4e24b46fcc 1/1/6 80 4 FORWARDING 1 0 8000cc4e24b46fcc 8000cc4e24b46fcc 1/1/7 80 4 FORWARDING 1 0 8000cc4e24b46fcc 8000cc4e24b46fcc 1/1/8 80 4 FORWARDING 1 0 8000cc4e24b46fcc 8000cc4e24b46fcc lg1 80 4 FORWARDING 1 0 8000cc4e24b46fcc 8000cc4e24b46fcc lg256 80 4 FORWARDING 1 0 8000cc4e24b46fcc 8000cc4e24b46fcc
The following example displays the STP information for each interface.
device# show span detail ====================================================================== VLAN 1 - SPANNING TREE (IEEE 802.1D) ACTIVE ====================================================================== Bridge identifier - 0x800000a0c9c002a0 Active global timers - Hello: 0 Topology change not set, Topology change detected not set, Topology change time 35 Number of topology changes: 113 Last topology change occured 46 second(s) ago on lg40 Port 1/1/1 is FORWARDING Port - Path cost: 4, Priority: 128, Port Identifier:128.0, Root: 0x800000a0c9c002a0 Root Bridge Priority:32768 Designated - Bridge: 0x800000a0c9c002a0, Priority:32768, Interface: 0, Identifier:128.0, Path cost: 0 Active Timers - Hold: 0 BPDUs - Sent: 5968, Received: 0 Port 1/1/2 is DISABLED Port 1/1/3 is DISABLED Port 1/1/4 is FORWARDING Port - Path cost: 4, Priority: 128, Port Identifier:128.3101, Root: 0x800000a0c9c002a0 Root Bridge Priority:32768 Designated - Bridge: 0x800000a0c9c002a0, Priority:32768, Interface: 3101, Identifier:128.3101, Path cost: 0 Active Timers - Hold: 0 BPDUs - Sent: 5978, Received: 52
The following example displays the STP information for a single port in a specific VLAN.
device# show span detail vlan 1 ethernet 1/1/1 ====================================================================== VLAN 1 - SPANNING TREE (IEEE 802.1D) ACTIVE ====================================================================== Bridge identifier - 0x800000a0c9c002a0 Active global timers - Hello: 0 Topology change not set, Topology change detected not set, Topology change time 35 Number of topology changes: 113 Last topology change occured 6 minute(s) 57 second(s) ago on lg40 Port 1/1/1 is FORWARDING Port - Path cost: 4, Priority: 128, Port Identifier:128.0, Root: 0x800000a0c9c002a0 Root Bridge Priority:32768 Designated - Bridge: 0x800000a0c9c002a0, Priority:32768, Interface: 0, Identifier:128.0, Path cost: 0 Active Timers - None BPDUs - Sent: 6152, Received: 0
The following example shows the STP information for a LAG port in a specific VLAN.
device# show span detail vlan 1 lag 40 ====================================================================== VLAN 1 - SPANNING TREE (IEEE 802.1D) ACTIVE ====================================================================== Bridge identifier - 0x800000a0c9c002a0 Active global timers - Hello: 0 Topology change not set, Topology change detected not set, Topology change time 35 Number of topology changes: 113 Last topology change occured 9 minute(s) 10 second(s) ago on lg40 Port lg40 is FORWARDING Port - Path cost: 4, Priority: 128, Port Identifier:128.3111, Root: 0x800000a0c9c002a0 Root Bridge Priority:32768 Designated - Bridge: 0x800000a0c9c002a0, Priority:32768, Interface: 3111, Identifier:128.3111, Path cost: 0 Active Timers - Hold: 0 BPDUs - Sent: 1842, Received: 4464
The following example shows the STP information for Ethernet interface, 1/1/3.
device# show interfaces ethernet 1/1/3 FastEthernet 1/1/3 is up, line protocol is up Port up for 1 hour 50 minutes 30 seconds Hardware is FastEthernet, address is 0000.00a9.bb49 (bia 0000.00a9.bb49) Configured speed auto, actual 100Mbit, configured duplex fdx, actual fdx Member of L2 VLAN ID 1, port is untagged, port state is FORWARDING STP configured to ON , priority is level0, flow control enabled mirror disabled, monitor disabled Not member of any active trunks Not member of any configured trunks No port name MTU 1518 bytes, encapsulation ethernet 5 minute input rate: 352 bits/sec, 0 packets/sec, 0.00% utilization 5 minute output rate: 0 bits/sec, 0 packets/sec, 0.00% utilization 1238 packets input, 79232 bytes, 0 no buffer Received 686 broadcasts, 0 runts, 0 giants 0 input errors, 0 CRC, 0 frame, 0 ignored 529 multicast 918 packets output, 63766 bytes, 0 underruns 0 output errors, 0 collisions
The following example shows the STP information for a LAG interface in global configuration mode.
device(config)# show interfaces lag 45 Lag lg45 is down, line protocol is down Configured speed Auto, actual None, configured duplex fdx, actual none Untagged member of L2 VLAN 1, port state is None BPDU guard is Disabled, ROOT protect is Disabled, Designated protect is Disabled STP configured to ON, priority is level0, mac-learning is enabled Openflow is Disabled, Openflow Hybrid mode is Disabled Mirror disabled, Monitor disabled Mac-notification is disabled VLAN-Mapping is disabled Member of active trunk ports 1/1/3,1/1/4,lg45, Lag Interface is lg45 Member of configured trunk ports 1/1/3,1/1/4,lg45, Lag Interface is lg45 No port name 300 second input rate: 0 bits/sec, 0 packets/sec, 0.00% utilization 300 second output rate: 0 bits/sec, 0 packets/sec, 0.00% utilization 0 packets input, 0 bytes, 0 no buffer Received 0 broadcasts, 0 multicasts, 0 unicasts 0 input errors, 0 CRC, 0 frame, 0 ignored 0 runts, 0 giants 0 packets output, 0 bytes, 0 underruns Transmitted 0 broadcasts, 0 multicasts, 0 unicasts 0 output errors, 0 collisions Relay Agent Information option: Disabled
The following example displays the STP states of all ports.
device# show interface brief | i Up Port Link State Dupl Speed Trunk Tag Pvid Pri MAC Name 1/1/16 Up Forward Full 1G 1 Yes 1 0 cc4e.246c.ea1f 1/1/17 Up Forward Full 1G 1 Yes 1 0 cc4e.246c.ea1f 1/1/21 Up Blocked Full 1G 2 Yes 1 0 cc4e.246c.ea24 1/1/22 Up Blocked Full 1G 2 Yes 1 0 cc4e.246c.ea24 1/2/1 Up Forward Full 10G None Yes 1 0 cc4e.246c.ea41 lg1 Up Forward Full 2G 1 Yes 1 0 cc4e.246c.ea1f lg2 Up Blocked Full 2G 2 Yes 1 0 cc4e.246c.ea24