Configuration Guide 216
Configuring Spanning Tree STP/RSTP Configurations
Note:
To prevent frequent network flapping, make sure that Hello Time, Forward Delay, and Max Age
conform to the following formulas:
•
2*(Hello Time + 1) <= Max Age
•
2*(Forward Delay - 1) >= Max Age
This example shows how to configure the priority of the switch as 36864, the Forward
Delay as 12 seconds:
Switch#configure
Switch(config)#spanning-tree priority 36864
Switch(config)#spanning-tree timer forward-time 12
Switch(config)#show spanning-tree bridge
State Mode Priority Hello-Time Fwd-Time Max-Age Hold-Count Max-Hops
------- ----- -------- ------ -------- -------- --------- --------
Enable Rstp 36864 2 12 20 5 20
Switch(config)#end
Switch#copy running-config startup-config
2.2.3 Enabling STP/RSTP Globally
Follow these steps to configure the spanning tree mode as STP/RSTP, and enable spanning
tree function globally:
Step 1 configure
Enter global configuration mode.
Step 2 spanning-tree mode { stp | rstp }
Configure the spanning tree mode as STP/RSTP.
stp
: Specify the spanning tree mode as STP .
rstp:
Specify the spanning tree mode as RSTP .
Step 3 spanning-tree
Enable spanning tree function globally.
Step 4 show spanning-tree active
(Optional) View the active information of STP/RSTP.
Step 5 end
Return to privileged EXEC mode.
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