Enabling the spanning tree feature, Basic concepts in stp – H3C Technologies H3C S12500-X Series Switches User Manual
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A port in auto mode sends 802.1s MSTP packets by default. When the port receives an MSTP packet of
a legacy format, the port starts to send packets only of the legacy format. This prevents the port from
frequently changing the format of sent packets. To configure the port to send 802.1s MSTP packets, shut
down and then bring up the port.
To configure the MSTP packet format to be supported on a port:
Step Command Remarks
1.
Enter system view.
system-view
N/A
2.
Enter Layer 2 Ethernet or
aggregate interface view.
interface interface-type interface-number
N/A
3.
Configure the mode that the
port uses to recognize/send
MSTP packets.
stp compliance { auto | dot1s | legacy }
The default setting is auto.
Enabling outputting port state transition information
In a large-scale spanning tree network, you can enable devices to output the port state transition
information of all MSTIs or the specified MSTI in order to 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 MSTP mode:
stp port-log instance { instance-list |
all }
By default, this function 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. Make sure the spanning tree feature is enabled globally and on the
desired ports.
You can disable the spanning tree feature for certain ports with the undo stp enable command to exclude
them from spanning tree calculation and save CPU resources of the device.
To enable the spanning tree feature:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enable the spanning tree
feature.
stp global enable
By default, the spanning tree
feature is disabled globally.
3.
Enter Layer 2 Ethernet or
aggregate interface view.
interface interface-type
interface-number
N/A