Switch User Manual

262 Spanning-Tree Commands
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Command Modes
Global Configuration mode
User Guidelines
• In RSTP mode, the switch would use STP when the neighbor switch is using STP.
• In MSTP mode the switch would use RSTP when the neighbor switch is using RSTP, and
would use STP when the neighbor switch is using STP
Example
The following example configures the spanning-tree protocol to RSTP.
spanning-tree forward-time
The spanning-tree forward-time Global Configuration mode command configures the spanning-
tree bridge forward time, which is the amount of time a port remains in the listening and learning
states before entering the forwarding state.
To reset the default forward time, use the
no form of this command.
Syntax
spanning-tree forward-time seconds
no spanning-tree forward-time
• seconds —Time in seconds. (Range: 4 - 30)
Default Configuration
The default forwarding-time for IEEE Spanning-tree Protocol (STP) is 15 seconds.
Command Modes
Global Configuration mode
User Guidelines
• When configuring the Forward-Time the following relationship should be kept:
– 2*(Forward-Time - 1) >= Max-Age
Example
The following example configures spanning-tree bridge forward time to 25 seconds.
Console(config)# spanning-tree mode rstp
Console(config)# spanning-tree forward-time 25