Cisco WS-C3560E-48PD-SF Command Reference - Page 619

Chapter 2 Catalyst 3560 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 hop-count Number of hops in a region before the BPDU is discarded. The range is 1 to 255 hops. Defaults The default is 20 hops. Command Modes Global configuration Command History Release 12.1(19)EA1 12.2(25)SEC Modification This command was introduced. The hop-count range changed to 1 to 255. 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 interface 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 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. 78-16405-05 Catalyst 3560 Switch Command Reference 2-587