Spanning-Tree Mst Max-Hops - Cisco Catalyst 3550 Command Reference Manual
Multilayer switch
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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 a port is
aged. Use the no form of this command to return to the default setting.
Syntax Description
hop-count
Defaults
The default is 20 hops.
Command Modes
Global configuration
Command History
Release
12.1(9)EA1
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. A switch discards the BPDU and ages the information held for the port when the count
reaches 0.
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 MST instances:
Switch(config)# spanning-tree mst max-hops 10
You can verify your settings by entering the show spanning-tree mst privileged EXEC command.
Related Commands
Command
show spanning-tree
spanning-tree mst forward-time
spanning-tree mst hello-time
spanning-tree mst max-age
Catalyst 3550 Multilayer Switch Command Reference
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spanning-tree mst max-hops hop-count
no spanning-tree mst max-hops
Number of hops in a region before the BPDU is discarded. The range is 1 to 40 hops.
Modification
This command was first introduced.
mst
Description
Displays multiple spanning-tree (MST) information.
Sets the forward-delay time for all MST instances.
Sets the interval between hello BPDUs sent by root switch
configuration messages.
Sets the interval between messages that the spanning tree
receives from the root switch.
Chapter 2 Cisco IOS Commands
78-11195-09
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