Specifying The Link Type; Restarting The Protocol - Cisco Nexus 3000 Series Configuration Manual

Configuring Multiple Spanning Tree
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
Step 1
Step 2
Step 3
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

Restarting the Protocol

An MST bridge can detect that a port is at the boundary of a region when it receives a legacy BPDU or an
MST BPDU that is associated with a different region. However, the STP protocol migration cannot determine
whether the legacy switch, which is a switch that runs only IEEE 802.1D, has been removed from the link
unless the legacy switch is the designated switch. Enter this command to restart the protocol negotiation (force
the renegotiation with neighboring switches) on the entire switch or on specified interfaces.
OL-29545-03
Command or Action
switch# configure terminal
switch(config)# interface type
slot/port
switch(config-if)# spanning-tree
link-type {auto | point-to-point |
shared}
Cisco Nexus 3000 Series NX-OS Layer 2 Switching Configuration Guide, Release 6.x
Purpose
Enters configuration mode.
Specifies the interface to configure, and enters interface
configuration mode.
Configures the link type to be either point to point or shared.
The system reads the default value from the switch
connection. 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.
Specifying the Link Type
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