Cisco Nexus 9000 Series Configuration Manual page 160

Specifying the Link Type for MST - CLI Version
If you have a half-duplex link physically connected point to point to a single port on a remote device, you can
override the default setting on the link type and enable rapid transitions.
If you set the link to shared, STP falls back to 802.1D.
Procedure
Step 1
Step 2
Step 3
Step 4
Step 5
Step 6
This example shows how to configure the link type as a point-to-point link:
switch# config t
switch (config)# interface ethernet 1/4
switch(config-if)# spanning-tree link-type point-to-point
switch(config-if)# exit
switch(config)#
Cisco Nexus 9000 Series NX-OS Layer 2 Switching Configuration Guide, Release 7.x
146
Command or Action
config t
Example:
switch# config t
switch(config)#
interface type slot/port
Example:
switch(config)# interface ethernet
1/4
switch(config-if)#
spanning-tree link-type {auto |
point-to-point | shared}
Example:
switch(config-if)# spanning-tree
link-type point-to-point
exit
Example:
switch(config-if)# exit
switch(config)#
show spanning-tree
Example:
switch# show spanning-tree
copy running-config startup-config
Example:
switch(config)# copy running-config
startup-config
Configuring MST Using Cisco NX-OS
Purpose
Enters configuration mode.
Specifies the interface to configure and enters the
interface configuration mode.
Configures the link type to be either a point-to-point
link or shared link. The system reads the default
value from the device connection, as follows: half
duplex links are shared and full-duplex links are
point to point. If the link type is shared, the STP
falls back to 802.1D. The default is auto, which sets
the link type based on the duplex setting of the
interface.
Exits interface mode.
(Optional)
Displays the STP configuration.
(Optional)
Copies the running configuration to the startup
configuration.