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Cisco ME 3400 Ethernet Access Switch Command Reference
OL-9640-07
Chapter 2 Cisco ME 3400 Ethernet Access 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 On the Cisco ME switch, spanning-tree MST configuration is supported only on network node interfaces
(NNIs) or on enhanced network interfaces (ENIs) on which Spanning Tree Protocol (STP) has been
enabled. To set a port as an NNI or ENI, enter the port-type {eni | nni} interface configuration
command. To enable STP on an ENI, enter the spanning-tree interface configuration command.
User network interfaces (UNIs) do not participate in STP.
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.
hop-count Number of hops in a region before the BPDU is discarded. The range is 1 to 255 hops.
Release Modification
12.2(25)EX This command was introduced.
12.2(25)SEG The hop-count range changed to 1 to 255.
- Reference 1
- CONTENTS 3
- Contents 10
- OL-9640-07 10
- A-11 13
- Audience 17
- Purpose 17
- Conventions 18
- Related Publications 18
- CLI Command Modes 21
- User EXEC Mode 22
- Privileged EXEC Mode 23
- Global Configuration Mode 23
- Interface Configuration Mode 24
- VLAN Configuration Mode 24
- Line Configuration Mode 24
- Ctrl-Z 25
- Cisco IOS Commands 27
- • The syntax for the FTP: 37
- • The syntax for the RCP: 37
- • The syntax for the TFTP: 37
- Switch# clear rep counters 77
- Switch# clear vmps statistics 81
- • module is always 0 87
- Switch# dot1x test timeout 27 111
- • service instance 126
- • ethernet uni 126
- • ethernet lmi t392 126
- • NTP broadcast service 166
- • NTP access restrictions 166
- • NTP authentication 166
- Transmission Control Protocol 293
- User Datagram Protocol 293
- • SPAN destination port 344
- • Private VLAN port 344
- • Tunnel port 344
- • Access port 344
- • cos—CoS value 362
- • dscp—DSCP value 364
- • Shutdown threshold 474
- • Drop threshold 474
- \ Command Description 523
- • 1000 Mbps—4 584
- • 100 Mbps—19 584
- • 10 Mbps—100 584
- command to display an 586
- • 1000 Mbps—20000 600
- • 100 Mbps—200000 600
- • 10 Mbps—2000000 600
- Ethernet ports 664
- Switch(config)# udld enable 675
- Switch# vmps reconfirm 692
- Switch(config)# vmps retry 7 694
- Boot Loader Commands 697
- • d—directory 704
- • r—readable 704
- • w—writable 704
- • x—executable 704
- [-test 707
- Debug Commands 723
- Show Platform Commands 803
- APPENDIX 851
- ) command A-11 858
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