3com 8807 Guía De Referencia

Ethernet port view

None

Use the stp root-protection command to enable on Root protection the switch.

Use the undo stp root-protection command to restore the default state of Root 
protection.

By default, Root protection is disabled.

In case of configuration error or malicious attack, the legal primary root may 
receive the BPDU with a higher priority and then loose its place, which causes 
network topology change errors. Due to the illegal change, the traffic supposed to 
travel over the high-speed link may be pulled to the low-speed link and congestion 
will occur on the network.

MSTP provides Root protection function to protect the root bridge: The port 
configured with Root protection only plays a role of designated port on every 
instance. Whenever such a port receives a higher-priority BPDU, it will be set to 
listening state and not forward packets any more (as if the link to the port is 
disconnected). If the port has not received any higher-priority BPDU for a certain 
period of time thereafter, it will resume the normal state.

Related command: stp interface root-protection.

# Enable Root protection on the Ethernet2/1/1 port of the switch.

<SW8800>system-view

 

System View: return to User View with Ctrl+Z.

 

[SW8800] interface Ethernet2/1/1

 

[3Com-Ethernet2/1/1] stp root-protection 

System view

None