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• In PVST or MSTP mode, the stp point-to-point force-false or stp
point-to-point force-true
command configured on a port takes effect on all VLANs or
all MSTIs.
• Before you set the link type of a port to point-to-point, make sure the port is connected to a
point-to-point link. Otherwise, a temporary loop might occur.
Procedure
1. Enter system view.
system-view
2. Enter interface view.
interface interface-type interface-number
3. Configure the port link type.
stp point-to-point { auto | force-false | force-true }
By default, the link type is auto where the port automatically detects the link type.
Configuring the mode a port uses to recognize
and send MSTP frames
About MSTP frame format
A port can receive and send MSTP frames in the following formats:
• dot1s—802.1s-compliant standard format
• legacy—Compatible format
By default, the frame format recognition mode of a port is auto. The port automatically distinguishes
the two MSTP frame formats, and determines the format of frames that it will send based on the
recognized format.
You can configure the MSTP frame format on a port. Then, the port sends only MSTP frames of the
configured format to communicate with devices that send frames of the same format.
By default, a port in auto mode sends 802.1s MSTP frames. When the port receives an MSTP frame
of a legacy format, the port starts to send frames only of the legacy format. This prevents the port
from frequently changing the format of sent frames. To configure the port to send 802.1s MSTP
frames, shut down and then bring up the port.
Restrictions and guidelines
When the number of existing MSTIs exceeds 48, the port can send only 802.1s MSTP frames.
Procedure
1. Enter system view.
system-view
2. Enter interface view.
interface interface-type interface-number
3. Configure the mode that the port uses to recognize/send MSTP frames.
stp compliance { auto | dot1s | legacy }
The default setting is auto.
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