Administrator Guide

Layer 2 Switching Commands 786
User Guidelines
This command can be configured even if the switch is configured for
MST(RSTP) mode. It is only used when the switch is configured for STP-PV
or RSTP-PV modes.
Example
This example configures a switch to use per VLAN spanning tree for VLANS
12, 13 and 24-26
console(config)#spanning-tree vlan 12,13,24-26
spanning-tree vlan forward-time
Use the spanning-tree vlan forward-time command to configure the
spanning 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 default
value.
Syntax
spanning-tree vlan vlan-list forward-time 4-30
no 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 Configuration
The default forward delay time is 15.
Command Modes
Global Configuration Mode
User Guidelines
Set this value to a lower number to accelerate the transition to forwarding.
The network operator should take into account the end to end BPDU
propagation delay, the maximum frame lifetime, the maximum transmission
halt delay and the message age overestimate values specific to their network
when configuring this parameter.
2CSNXXX_SWUM204.book Page 786 Monday, January 25, 2016 1:25 PM