دوستان من تونستم اینها رو تو سایت سیسکو پیدا کنم :
دوتا تعریف بود برای spanning-tree link-type
Rapid connectivity is established only on point-to-point links. You must configure ports explicitly to a host or switch. However, cabling in most networks meets this requirement, and you can avoid explicit configuration by treating all full-duplex links as point-to-point links by entering the spanning-tree linktype
Use the spanning-tree link-type
interface configuration command to override the default link-type setting, which is determined by the duplex mode of the interface, and to enable rapid spanning-tree transitions to the forwarding state. Use the no
form of this command to return to the default setting.
no spanning-tree link-type
Specify that the link type of an interface is point-to-point.
Specify that the link type of an interface is shared.
The switch derives the link type of an interface from the duplex mode. A full-duplex interface is considered a point-to-point link, and a half-duplex interface is considered a shared link.
This command was introduced.
You can override the default setting of the link type by using the spanning-tree link-type
command. For example, a half-duplex link can be physically connected point-to-point to a single interface on a remote switch running the Multiple Spanning Tree Protocol (MSTP) or the rapid per-VLAN spanning-tree plus (rapid-PVST+) protocol and be enabled for rapid transitions.
This example shows how to specify the link type as shared (regardless of the duplex setting) and to prevent rapid transitions to the forwarding state:
Switch(config-if)# spanning-tree link-type shared