forward-delay

9

forward-delay

 

 

 

 

Specifies the time an interface spends in each of the listening and learning states.

 

Synopsis

forward-delay seconds

 

 

no forward-delay

 

 

Operands

seconds

Specifies the range of time in seconds that an interface spends in the

 

 

 

Spanning Tree Protocol (STP) learning and listening states. The range of valid

 

 

values is 4-30.

 

Defaults

The default is 15 seconds.

 

Command

Protocol Spanning Tree mode

 

Modes

 

 

 

Description

Use this command to specify how long the listening and learning states last before the interface

 

begins the forwarding of all spanning-tree instances. Use the no forward-delaycommand to return

 

to the default settings.

 

Note STP interface states:

•Listening - The interface processes the Bridge Protocol Data Units (BPDUs) and awaits possible new information that might cause it to return to the blocking state.

•Learning - The interface does not yet forward frames (packets), instead it learns source addresses from frames received and adds them to the filtering database (switching database).

•Forwarding - An interface receiving and sending data, normal operation. STP still monitors incoming BPDUs that can indicate it should return to the blocking state to prevent a loop.

•Blocking - An interface that can cause a switching loop, no user data is sent or received, but it might go to the forwarding state if the other links in use fail and the STP determines that the interface may transition to the forwarding state. BPDU data continues to be received in the blocking state.

Usage When you change the spanning-tree forward-delay time, it affects all spanning-tree instances. Guidelines When configuring the forward-delay, the following relationship should be kept:

2*(forward-delay - 1)>=max-age>=2*(hello-time + 1)

Examples To configure the forward-delay time to 18 seconds:

switch(conf-mstp)#forward-delay 18

See Also

hello-time,max age

Converged Enhanced Ethernet Command Reference

131

53-1001762-01

 

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Brocade Communications Systems 53-1001762-01 manual Synopsis Forward-delay seconds No forward-delay Operands
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53-1001762-01 specifications

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