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RSTP only works on point-to-point links between two bridges.
If you designate a port as a shared link, RSTP is forbidden.
Example

show spanning-tree

Use this command to show the configuration for the Spanning
Tree.
Syntax
show spanning-tree [interface]
interface
ethernet unit/port-number
-unit - This is device 1.
-port-number
port-channel channel-id (Range: 1-6)
Default Setting
None
Command Mode
Privileged Exec
Command Usage
•Use the show spanning-tree command with no parameters to
display the Spanning Tree configuration for the Spanning Tree
and for every interface in the tree.
•Use the show spanning-tree interface command to display
the Spanning Tree configuration for an interface within the
Spanning Tree
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree link-type point-to-point
Console(config-if)#
b_mgmt.book Page 128 Tuesday, July 8, 2003 5:24 PM