14.
Multiple Spanning Tree Protocol (MSTP)
MN700004 Rev 01
158
Auto
From the point of view of determining the value of the link-type, an MSTP port is
considered to be connected to a point-to-point LAN segment if any of the following
conditions are true:
a) The port’s link-type is set to Auto, and the MST algorithm has determined that the LAN
segment is to be operated in full duplex mode.
b) The port has been configured by management means for full duplex operation.
Otherwise, the MAC is considered to be connected to a LAN segment that is not point-to-
point (shared media).
Point-to-point
The port is considered to be connected to a point-to-point LAN segment which forces
the operational link-type to be point-to-point.
Shared
The port is considered to be connected to a shared media LAN segment which forces
the operational link-type to be Shared.
2. Operational link-type
If Admin link-type is set to Auto, then the value of Operational link-type
is determined in
accordance with the specific procedures defined for the switch entity concerned, as defined in
Admin link-type (auto).
If these procedures determine that the port is connected to a point-to-point LAN segment,
then Operational link-type
is set to point-to-point, otherwise it is set to
Shared
.
In the absence of a specific definition of how to determine whether the port is connected to a
point-to-point LAN segment or not, the value of link-type shall be
Shared
.
Command Syntax
device-name
(config-if
UU/SS/PP
)#
mstp link-type
{
point-to-point
|
shared
|
auto
}
Argument Description
point-to-point
Sets the MSTP link type to point-to-point.
shared
Sets the MSTP link type to shared.
auto
Sets the MSTP link type dynamically according to the duplex status.
Setting the Default MSTP
The
mstp default
command, in Interface Configuration mode, sets the MSTP port
configuration to its default values.
Command Syntax
device-name
(config-if UU/SS/PP)#
mstp default
Forcing a Port to Work by the RSTP Protocol
The
mstp detect-protocols
command, in Interface Configuration mode, forces the port to
work by the Rapid Spanning Tree Protocol (RSTP) and not by the Spanning Tree Protocol