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Catalyst 3750 Metro Switch Command Reference
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Chapter 2 Catalyst 3750 Metro Switch Cisco IOS Commands
spanning-tree mst max-hops
spanning-tree mst max-hops
Use the
spanning-tree mst max-hops
global configuration command to set the number of hops in a
region before the bridge protocol data unit (BPDU) is discarded and the information held for an interface
is aged. Use the
no
form of this command to return to the default setting.
spanning-tree mst max-hops
hop-count
no spanning-tree mst max-hops
Syntax Description
Defaults
The default is 20 hops.
Command Modes
Global configuration
Command History
Usage Guidelines
The root switch of the instance always sends a BPDU (or M-record) with a cost of 0 and the hop count
set to the maximum value. When a switch receives this BPDU, it decrements the received remaining hop
count by one and propagates the decremented count as the remaining hop count in the generated
M-records. When the count reaches 0, a switch discards the BPDU and ages the information held for the
interface.
Changing the
spanning-tree mst max-hops
command affects all spanning-tree instances.
Examples
This example shows how to set the spanning-tree max-hops to 10 for all multiple spanning-tree (MST)
instances:
Switch(config)#
spanning-tree mst max-hops 10
You can verify your setting by entering the
show spanning-tree mst
privileged EXEC command.
hop-count
Number of hops in a region before the BPDU is discarded. The range is 1 to 255 hops.
Release
Modification
12.1(14)AX
This command was introduced.
12.2(25)SEG
The
hop-count
range changed to 1 to 255.
