Command Manual – MSTP
H3C S7500E Series Ethernet Switches Chapter 1 MSTP Configuration Commands
1-22
Description
Use the stp max-hops command to set the maximum number of hops of the MST
region on the device.
Use the undo stp max-hops command to restore the maximum number of hops to the
default setting.
By default, the maximum number of hops of an MST region is 20.
In the CIST and spanning tree instances, the maximum hops setting configured on the
regional root bridge determines the maximum network diameter supported by this MST
region. After a configuration BPDU leaves the root bridge, its hop count is decremented
by 1 whenever it passes a device. When its hop count reaches 0, it will be discarded by
the device that has received it. As a result, devices beyond the maximum hop count are
unable to take part in spanning tree calculation, and thereby the size of the MST region
is limited.
When the current device becomes the root bridge of the CIST or an MSTI, the
maximum hops setting configured on the device becomes the network diameter of that
spanning tree and restricts the size of that spanning tree in the current MST region.
Devices other than the root bridge in an MST region use the maximum hops setting on
the root bridge.
Examples
# Set the maximum number of hops of the MST region to 35.
<Sysname> system-view
[Sysname] stp max-hops 35
1.1.23 stp mcheck
Syntax
stp mcheck
View
System view, Ethernet interface view
Parameters
None
Description
Use the stp mcheck command to carry out the mCheck operation globally or on the
current port.
In a switched network, if a port on the device running MSTP (or RSTP) connects to a
device running STP, this port will automatically migrate to the STP-compatible mode.
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