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•
The peer STP device is shut down or removed.
•
The port cannot detect the change.
In this case, you can perform an mCheck operation to forcibly transit the port to operate in the
original mode.
The device operates in STP, RSTP, PVST, or MSTP mode, depending on the spanning tree mode
setting.
The stp global mcheck command takes effect only when the device operates in MSTP, RSTP, or
PVST mode.
Examples
# Perform mCheck globally.
<Sysname> system-view
[Sysname] stp global mcheck
Related commands
•
stp mcheck
•
stp mode
stp loop-protection
Use stp loop-protection to enable loop guard on a port.
Use undo stp loop-protection to disable loop guard on a port.
Syntax
stp loop-protection
undo stp loop-protection
Default
Loop guard is disabled.
Views
Layer 2 Ethernet interface view, Layer 2 aggregate interface view
Predefined user roles
network-admin
Usage guidelines
On a port, the loop guard feature is mutually exclusive with the root guard feature or the edge port
setting.
When the setting is configured in Layer 2 Ethernet interface view, it takes effect only on that
interface.
When the setting is configured in Layer 2 aggregate interface view, it takes effect only on the
aggregate interface.
When the setting is configured on a member port in an aggregation group, it takes effect only after
the port leaves the aggregation group.
Examples
# Enable loop guard on GigabitEthernet 1/0/1.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0/1
[Sysname-GigabitEthernet1/0/1] stp loop-protection
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