HP StorageWorks 1606 Brocade Converged Enhanced Ethernet Command Reference v6. - Page 149

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-delay command 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 Guidelines When you change the spanning-tree forward-delay time, it affects all spanning-tree instances. 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 53-1001347-01