Chapter 17
| Spanning Tree Commands
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Command Mode
Privileged Exec
Command Usage
If at any time the switch detects STP BPDUs, including Configuration or Topology
Change Notification BPDUs, it will automatically set the selected interface to forced
STP-compatible mode. However, you can also use the spanning-tree protocol-
migration command at any time to manually re-check the appropriate BPDU
format to send on the selected interfaces (i.e., RSTP or STP-compatible).
Example
Console#spanning-tree protocol-migration eth 1/5
Console#
show spanning-tree This command shows the configuration for the common spanning tree (CST), for all
instances within the multiple spanning tree (MST), or for a specific instance within
the multiple spanning tree (MST).
Syntax
show spanning-tree [interface | mst instance-id]
interface
ethernet unit/port
unit - Unit identifier. (Range: 1)
port - Port number. (Range: 1-32/54)
port-channel channel-id (Range: 1-27)
instance-id - Instance identifier of the multiple spanning tree.
(Range: 0-4094, no leading zeroes)
Default Setting
None
Command Mode
Privileged Exec
Command Usage
â—† Use the show spanning-tree command with no parameters to display the
spanning tree configuration for the switch for the Common Spanning Tree
(CST) and for every interface in the tree.
â—† Use the show spanning-tree interface command to display the spanning tree
configuration for an interface within the Common Spanning Tree (CST).
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