H3C Technologies H3C S12500-X Series Switches - Manual (Page 106)

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Step Command Remarks
3. Enable the loop guard
function for the ports.
stp loop-protection
By default, loop guard is
disabled.
Configuring port role restriction
CAUTION:
Use this feature with caution, because enabling port role restriction on a port might affect the connectivity
of the spanning tree topology.
The change to the bridge ID of a device in the user access network might cause a change to the spanning
tree topology in the core network. To avoid this problem, you can enable port role restriction on a port.
With this feature enabled, when the port receives a superior BPDU, it becomes an alternate port rather
than a root port.
Make this configuration on the port that connects to the user access network.
To configure port role restriction:
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. Enable port role restriction. stp role-restriction
By default, port role restriction is
disabled.
Configuring TC-BPDU transmission restriction
CAUTION:
Enabling TC-BPDU transmission restriction on a port might cause the previous forwarding address table to
fail to be updated when the topology changes.
The topology change to the user access network might cause the forwarding address changes to the core
network. When the user access network topology is unstable, the user access network might affect the
core network. To avoid this problem, you can enable TC-BPDU transmission restriction on a port. With
this feature enabled, when the port receives a TC-BPDU, it does not forward the TC-BPDU to other ports.
Make this configuration on the port that connects to the user access network.
To configure TC-BPDU transmission restriction:
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. Enable TC-BPDU transmission
restriction.
stp tc-restriction
By default, TC-BPDU transmission
restriction is disabled.