Purpose
Command or Action
Sets the interface to the switch-wide MST and Rapid
PVST+ interoperation that you configured using the
spanning-tree mst simulate pvst global
command.
switch(config-if)#
no spanning-tree
mst simulate pvst
Step 5
This example shows how to prevent the specified interfaces from automatically interoperating with a connecting
switch that is not running MST:
switch#
configure terminal
switch(config)#
interface ethernet 1/4
switch(config-if)#
spanning-tree mst simulate pvst disable
Specifying the Link Type
Rapid connectivity (802.1w standard) is established only on point-to-point links. By default, the link type is
controlled from the duplex mode of the interface. A full-duplex port is considered to have a point-to-point
connection; a half-duplex port is considered to have a shared connection.
If you have a half-duplex link physically connected point-to-point to a single port on a remote switch, you
can override the default setting on the link type and enable rapid transitions.
If you set the link to shared, STP reverts to 802.1D.
Procedure
Purpose
Command or Action
Enters configuration mode.
switch#
configure terminal
Step 1
Specifies the interface to configure, and enters interface
configuration mode.
switch(config)#
interface type
slot
/
port
Step 2
If this is a 10G breakout port, the
slot
/
port
syntax is
QSFP-module
/
port
.
Note
Configures the link type to be either point to point or shared.
The system reads the default value from the switch connection.
switch(config-if)#
spanning-tree
link-type
{
auto
|
point-to-point
|
shared
}
Step 3
Half-duplex links are shared and full-duplex links are point
to point. If the link type is shared, the STP reverts to 802.1D.
The default is auto, which sets the link type based on the
duplex setting of the interface.
This example shows how to configure the link type as point to point:
switch#
configure terminal
switch (config)#
interface ethernet 1/4
switch(config-if)#
spanning-tree link-type point-to-point
Cisco Nexus 6000 Series NX-OS Layer 2 Switching Configuration Guide, Release 7.x
91
Configuring Multiple Spanning Tree
Specifying the Link Type
