3com 5500-ei pwr Guía De Referencia

 

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# Disable MSTP on Ethernet 1/0/1 to Ethernet 1/0/4 in system view. 

<Sysname> system-view  

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

[Sysname] stp interface Ethernet 1/0/1 to Ethernet 1/0/4 disable 

stp bpdu-protection 

undo stp bpdu-protection 

System view 

None 

Use the stp bpdu-protection command to enable the BPDU guard function on the switch. 

Use the undo stp bpdu-protection command to restore to the default state of the BPDU guard 

function. 

By default, the BPDU guard function is disabled. 

Normally, the access ports of the devices operating on the access layer are directly connected to 

terminals (such as PCs) or file servers. These ports are usually configured as edge ports to implement 

rapid transition. But they resume non-edge ports automatically upon receiving configuration BPDUs, 

which causes spanning trees recalculation and network topology jitter. 

Normally, no configuration BPDU will reach edge ports. But malicious users can attack a network by 

sending configuration BPDUs deliberately to edge ports to cause network jitter. You can prevent such 

attacks by enabling the BPDU guard function. With this function enabled on a switch, the switch shuts 

down the edge ports that receive configuration BPDUs and then reports these cases to the 

administrator. If an edge port is shut down, only the administrator can restore it. 

 

You are recommended to enable BPDU guard for devices with edge ports configured.  

 

As Gigabit ports of a 3Com switch 5500-EI cannot be shut down, the BPDU guard function is not 

applicable to these ports even if you enable the BPDU guard function and specify these ports to be 

MSTP edge ports.