3com S7906E Guide De Référence

 

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number: Maximum number of times the device deletes forwarding address entries within a certain 

period of time immediately after it receives the first TC-BPDU, in the range of 1 to 255.  

Use the stp tc-protection threshold command to configure the maximum number of times the device 

deletes forwarding address entries within 10 seconds immediately after it receives the first TC-BPDU. 

Use the undo stp tc-protection threshold command to restore the system default.  

By default, the device deletes forwarding address entries a maximum of six times within a certain period 

of time immediately after it receives the first TC-BPDU.  

# Set the maximum number of times the device deletes forwarding address entries within a certain 

period of time immediately after it receives the first TC-BPDU to 10.  

<Sysname> system-view 

[Sysname] stp tc-protection threshold 10 

stp timer forward-delay centi-seconds 

undo stp timer forward-delay 

System view 

2: System level 

centi-seconds: Forward delay in centiseconds, ranging form 400 to 3000 in steps of 100. 

Use the stp timer forward-delay command to set the forward delay timer of the device.  

Use the undo stp timer forward-delay command to restore the system default.  

By default, the forward delay timer is set to 1,500 centiseconds.  

In order to prevent temporary loops, a port must go through an intermediate state, the learning state, 

before it transitions from the discarding state to the forwarding state, and must wait a certain period of 

time before it transitions from one state to another to keep synchronized with the remote device during 

state transition. The forward delay timer set on the root bridge determines the time interval of state 

transition.  

If the current device is the root bridge, the state transition interval of the device depends on the set 

forward delay value; for a secondary root bridge, its state transition interval is determined by the forward 

delay timer set on the root bridge.  

The settings of the hello time, forward delay and max age timers must meet the following formulae: