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•
If the physical link to which the port connects is not a point-to-point link but you set it to be one,
the configuration might bring a temporary loop.
Configuration procedure
To configure the link type of a port or a group of ports:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter interface view or
port group view.
•
Enter Layer 2 Ethernet interface view or
Layer 2 aggregate interface view:
interface interface-type interface-number
•
Enter port group view:
port-group manual port-group-name
Use one of the
commands.
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/send MSTP packets
A port can receive/send MSTP packets in the following formats:
•
dot1s
—802.1s-compliant standard format
•
legacy
—Compatible format
By default, the packet format recognition mode of a port is
auto
. The port automatically distinguishes
the two MSTP packet formats, and determines the format of packets that it will send based on the
recognized format.
You can configure the MSTP packet format on a port. When operating in MSTP mode after the
configuration, the port sends and receives only MSTP packets of the format that you have configured
to communicate with devices that send packets of the same format.
MSTP provides MSTP packet format incompatibility guard. In MSTP mode, if a port is configured to
recognize/send MSTP packets in a mode other than
auto
, and if it receives a packet in a format
different from the specified type, the port becomes a designated port and remains in the discarding
state to prevent the occurrence of a loop.
MSTP provides MSTP packet format frequent change guard. If a port receives MSTP packets of
different formats frequently, the MSTP packet format configuration contains errors. If the port is
operating in MSTP mode, it will be shut down for protection. Ports disabled in this way can be
re-activated after a detection interval. For more information about the detection interval, see
Fundamentals Configuration Guide
.
To configure the MSTP packet format to be supported on a port or a group of ports:
Step Command
Remarks
1.
Enter system view.
system-view
N/A