Layer 2 Switching Commands 770Forward delay is only application to STP modes. The forward delay setting isignored in MSTP, RSTP and RSTP-PV modes as the designated port istransitioned to the forwarding state immediately.Exampleconsole(config)#spanning-tree vlan 3 forward-time 12spanning-tree vlan hello-timeUse the spanning-tree vlan hello-time command to configure the spanningtree hello time for a specified VLAN or a range of VLANs.Syntaxspanning-tree vlan vlan-list hello-time 1-10no spanning-tree vlan vlan-list hello-time• Hello-time–The interval between sending successive BDPUs. Default: 2seconds.Default ConfigurationThe default hello time is 2 seconds.Command ModesGlobal Configuration ModeUser 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.Set this value to a lower number to accelerate discovery of topology changes.Use the no form of the command to return the hello time to its default value.Exampleconsole(config)#spanning-tree vlan 3 hello-time 1
