Specifying The Link Type - Cisco Nexus 5000 Series Configuration Manual

Configuring Multiple Spanning Tree
DETAILED STEPS
Command or Action
Step 1
switch# configure terminal
Step 2
switch(config)# interface {{type slot/port} |
{port-channel number}}
Step 3 switch(config-if)# spanning-tree mst simulate
pvst disable
Step 4 switch(config-if)# spanning-tree mst simulate
pvst
Step 5 switch(config-if)# no spanning-tree mst
simulate pvst
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.
SUMMARY STEPS
1. switch# configure terminal
2. switch(config)# interface type slot/port
3. switch(config-if)# spanning-tree link-type {auto | point-to-point | shared}
Purpose
Enters configuration mode.
Specifies an interface to configure, and enters interface configuration
mode.
Disables specified interfaces from automatically interoperating with
connected switch that is running in Rapid PVST+ mode.
By default, all interfaces on the switch operate seamlessly between
Rapid PVST+ and MST.
Re-enables seamless operation between MST and Rapid PVST+ on
specified interfaces.
Sets the interface to the switch-wide MST and Rapid PVST+
interoperation that you configured using the spanning-tree mst
simulate pvst global command.
Cisco Nexus 5000 Series NX-OS Layer 2 Switching Configuration Guide, Release 5.0(3)N1(1)
Specifying the Link Type
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