Configuring The Mode A Port Uses To Recognize And Send Mstp Frames; Enabling Outputting Port State Transition Information - H3C S7500X Series Configuration Manual

Step
Enter system view.
1.
Enter Layer 2 Ethernet
2.
interface or Layer 2
aggregate interface view.
Configure the port link type.
3.
Configuring the mode a port uses to recognize
and send MSTP frames
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.
When the number of existing MSTIs exceeds 48, the port can send only 802.1s MSTP frames.
To configure the MSTP frame format to be supported on a port:
Step
Enter system view.
1.
Enter Layer 2 Ethernet
2.
interface or Layer 2
aggregate interface view.
Configure the mode that the
3.
port uses to recognize/send
MSTP frames.
Enabling outputting port state transition
information
In a large-scale spanning tree network, you can enable devices to output the port state transition
information. Then, you can monitor the port states in real time.
To enable outputting port state transition information:
Command
system-view
interface interface-type
interface-number
stp point-to-point { auto |
force-false | force-true }
Command
system-view
interface interface-type
interface-number
stp compliance { auto | dot1s |
legacy }
37
Remarks
N/A
N/A
By default, the link type is auto
where the port automatically
detects the link type.
Remarks
N/A
N/A
The default setting is auto.