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Enabling outputting port state transition
information
In a large-scale spanning tree network, you can enable devices to output the port state transition
information. Then, you can monitor the port states in real time.
To enable outputting port state transition information:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enable outputting port
state transition
information.
• In STP/RSTP mode:
stp port-log instance 0
• In PVST mode:
stp port-log vlan vlan-id-list
• In MSTP mode:
stp port-log { all | instance
instance-list }
By default, this feature is
enabled.
Enabling the spanning tree feature
You must enable the spanning tree feature for the device before any other spanning tree related
configurations can take effect. In STP, RSTP, or MSTP mode, make sure the spanning tree feature is
enabled globally and on the desired ports. In PVST mode, make sure the spanning tree feature is
enabled globally, in the desired VLANs, and on the desired ports.
To exclude specific ports from spanning tree calculation and save CPU resources, disable the
spanning tree feature for these ports with the undo stp enable command. Make sure no loops occur
in the network after you disable the spanning tree feature on these ports.
Enabling the spanning tree feature in STP/RSTP/MSTP
mode
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enable the spanning tree
feature.
stp global enable
When the device starts up with
initial settings, the spanning tree
feature is globally disabled.
When the device starts up with
factory defaults, the spanning tree
feature is globally enabled.
For more informaiton about the
initial settings and factory
defaults, see Fundamentals
Configuration Guide.
3. Enter Layer 2 Ethernet
interface or Layer 2
aggregate interface view.
interface
interface-type
interface-number
N/A
4. (Optional.) Enable the
spanning tree feature for the
port.
stp
enable
By default, the spanning tree
feature is enabled on all ports.
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