Layer 2 Switching Commands 769User GuidelinesThis command can be configured even if the switch is configured forMST(RSTP) mode. It is only used when the switch is configured for STP-PVor RSTP-PV modes.ExampleThis example configures a switch to use per VLAN spanning tree for VLANS12, 13 and 24-26console(config)#spanning-tree vlan 12,13,24-26spanning-tree vlan forward-timeUse the spanning-tree vlan forward-time command to configure thespanning tree forward delay time for a specified VLAN or a range of VLANs.Use the no form of the command to return the forward time to its defaultvalue.Syntaxspanning-tree vlan vlan-list forward-time 4-30no spanning-tree vlan vlan-list forward-time• forward-time — The interval (time spent in listening and learning states)before transitioning a port to the forwarding state. (Range: 4-30 seconds)Default ConfigurationThe default forward delay time is 15.Command ModesGlobal Configuration ModeUser GuidelinesSet this value to a lower number to accelerate the transition to forwarding.The network operator should take into account the end to end BPDUpropagation delay, the maximum frame lifetime, the maximum transmissionhalt delay and the message age overestimate values specific to their networkwhen configuring this parameter.
