Enabling The Spanning Tree Feature; Configuration Restrictions And Guidelines; Enabling The Spanning Tree Feature (In Stp/Rstp/Mstp Mode); Enabling The Spanning Tree Feature (In Pvst Mode) - HP 5120 EI Series Lan Switching Configuration Manual

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.

Configuration restrictions and guidelines

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.
• In PVST mode, when you globally enable the spanning tree feature the device automatically
enables the spanning tree feature for the first n (which is the number of PVST instances that the
switch supports and is 32 for the HP 5120 EI switch) of the existing VLANs by default. To enable the
spanning tree feature for other VLANs, you must first disable the spanning tree feature for certain
VLANs. This guideline does not apply if the number of existing VLANs on the switch does not
exceed n.

Enabling the spanning tree feature (in STP/RSTP/MSTP mode)

In STP/RSTP/MSTP mode, make sure that the spanning tree feature is enabled globally and on the
desired ports.
To enable the spanning tree feature in STP/RSTP/MSTP mode:
Step
1. Enter system view.
2. Enable the spanning
tree feature globally.
3. Enter interface view or
port group view.
4. Enable the spanning
tree feature for the
port or group of ports.

Enabling the spanning tree feature (in PVST mode)

In PVST mode, make sure that the spanning tree feature is enabled globally and on the desired VLANs
and ports.
To enable the spanning tree feature in PVST mode:
Step
1. Enter system view.
2. Globally enable the spanning
tree feature.
Command
system-view
stp enable
•
Enter Layer 2 Ethernet interface view or
Layer 2 aggregate interface view:
interface interface-type interface-number
•
Enter port group view:
port-group manual port-group-name
stp enable
Command
system-view
stp enable
87
Remarks
N/A
By default, the spanning tree
feature is disabled globally.
Use either command.
Optional.
By default, the spanning tree
feature is enabled for all ports.
Remarks
N/A
By default, the spanning tree
feature is disabled globally.