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| 3.8 |  | RSTP and MST Configuration |
| 3.8.8 |  | Configuring MSTP timers |

MSTP Hello Time
The interval of the generation of configuration messages by the root switch may be changed by adjusting the hello time. Exercise care when using this command. For most situations, it is recommended to use the spanning-tree mst instance-id root primary and the spanning-tree mst instance-id root secondary global configuration commands to modify the hello time.

Beginning in privileged EXEC mode, follow the steps outlined in Figure to configure the hello time for all MST instances.

To return the switch to its default setting, use the no spanning-tree mst hello-time global configuration command.

MSTP Forward Delay Time
Beginning in privileged EXEC mode, follow the steps shown in Figure to configure the forwarding-delay time for all MST instances.

To return the switch to its default setting, use the no spanning-tree mst forward-time global configuration command.

MSTP Maximum Aging Time
Beginning in privileged EXEC mode, follow the steps outlined in Figure to configure the maximum-aging time for all MST instances.

To return the switch to its default setting, use the no spanning-tree mst max-age global configuration command.