set protocols spanning-tree mstp max-hops

The set protocols spanning-tree mstp max-hops command sets the maximum hops of a spanning tree when MSTP is running.

Command Syntax

set protocols spanning-tree mstp max-hops <max-hops>

Parameter

Usage Guidelines

The maximum number of hops of a spanning tree in an MST region determines the network scale.

An MST BPDU has a field that indicates the number of remaining hops:

• The number of remaining hops in a BPDU sent by the root switching device equals the maximum number of hops.
• The number of remaining hops in a BPDU sent by a non-root switching device equals the maximum number of hops minus the number of hops from the non-root switching device to the root switching device.
• If a switching device receives a BPDU in which the number of remaining hops is 0, the switching device will discard the BPDU.

Example

• Set the maximum hops of a spanning tree to 15 when MSTP is running.

admin@Xorplus# set protocols spanning-tree mstp max-hops 15
admin@Xorplus# commit