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Default
The maximum number of hops for an MST region is 20.
Views
System view
Predefined user roles
network-admin
Parameters
hops: Specifies the maximum hops in the range of 1 to 40.
Examples
# Set the maximum hops of the MST region to 35.
<Sysname> system-view
[Sysname] stp max-hops 35
Related commands
display stp
stp mcheck
Use stp mcheck to perform mCheck on a port.
Syntax
stp mcheck
Views
Layer 2 Ethernet interface view
Layer 2 aggregate interface view
Predefined user roles
network-admin
Usage guidelines
When a port on an MSTP, RSTP, or PVST device connects to an STP device and receives STP
BPDUs, the port automatically transits to the STP mode. However, the port cannot automatically
transit back to the original mode when the following conditions exist:
• 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 operation in the
original mode.
For example, Device A, Device B, and Device C are connected in sequence. Device A runs STP,
Device B does not run any spanning tree protocol, and Device C runs RSTP, MSTP, or PVST. When
Device C receives an STP BPDU transparently transmitted by Device B, the receiving port transits to
the STP mode. If you configure Device B to run RSTP, MSTP, or PVST with Device C, perform
mCheck operations on the ports that connect Device B and Device C.
The device operates in STP, RSTP, PVST, or MSTP mode, depending on the spanning tree mode
setting.
The
stp mcheck command takes effect only when the device operates in MSTP, RSTP, or PVST
mode.
If this command is configured in Layer 2 Ethernet interface view, it takes effect only on that interface.
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