System information

3-80
Command Line Interface
3
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
spanning-tree link-type
Use this command to configure the link type for Rapid Spanning Tree. Use the no
form to restore the default.
Syntax
spanning-tree link-type {auto | point-to-point | shared}
no spanning-tree link-type
• auto - Automatically derived from the duplex mode setting.
• point-to-point - Point-to-point link.
• shared - Shared medium.
Default Setting
auto
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• Specify a point-to-point link if the interface can only be connected to exactly
one other bridge, or a shared link if it can be connected to two or more bridges.
• When automatic detection is selected, the switch derives the link type from the
duplex mode. A full-duplex interface is considered a point-to-point link, while
a half-duplex interface is assumed to be on a shared link.
• RSTP only works on point-to-point links between two bridges. If you designate
a port as a shared link, RSTP is forbidden.
Example
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree protocol-migration
Console(config-if)#
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree link-type point-to-point
Console(config-if)#