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Catalyst 2950 and Catalyst 2955 Switch Command Reference
0L-10102-02
Chapter 2 Catalyst 2950 and 2955 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 a port 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. 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
hop-count Number of hops in a region before the BPDU is discarded. The range is 1 to 40 hops.
Release Modification
12.1(9)EA1 This command was introduced.
12.1(20)EA2 This command was added to the standard software image (SI).
Command Description
show spanning-tree mst Displays multiple spanning-tree (MST) information.
spanning-tree mst forward-time Sets the forward-delay time for all MST instances.
spanning-tree mst hello-time Sets the interval between hello BPDUs sent by root switch
configuration messages.
spanning-tree mst max-age Sets the interval between messages that the spanning tree
receives from the root switch.
- Command Reference 1
- CONTENTS 3
- Contents 10
- OL-10102-02 10
- B-10 12
- Audience 15
- Conventions 15
- Related Publications 16
- Type of Memory 19
- Platforms 19
- CLI Command Modes 20
- User EXEC Mode 21
- Privileged EXEC Mode 21
- Global Configuration Mode 22
- Interface Configuration Mode 22
- VLAN Configuration Mode 23
- Line Configuration Mode 23
- Command Summary 24
- Command Summary 26
- aaa authentication dot1x 30
- access-list (IP extended) 31
- access-list (IP standard) 34
- • The syntax for the FTP: 36
- • The syntax for the TFTP: 38
- archive tar 39
- archive upload-sw 42
- auto qos voip 44
- boot boothlpr 47
- boot buffersize 48
- boot config-file 49
- boot enable-break 50
- boot helper 51
- boot helper-config-file 52
- boot manual 53
- boot private-config-file 54
- boot system 55
- channel-group 56
- channel-protocol 60
- class 61
- class-map 63
- clear controllers lre log 69
- clear mac address-table 73
- clear vmps statistics 80
- Switch# clear vmps statistics 80
- clear vtp counters 81
- Switch# clear vtp counters 81
- cluster enable 85
- cluster management-vlan 87
- cluster member 88
- cluster run 90
- cpe toggle 103
- define interface-range 105
- delete 107
- Switch# delete flash:filename 107
- • Class of service (CoS) 112
- dot1x 114
- dot1x auth-fail vlan 116
- dot1x default 120
- dot1x guest-vlan 121
- dot1x initialize 124
- dot1x max-req 125
- dot1x multiple-hosts 126
- dot1x port-control 127
- dot1x re-authenticate 129
- dot1x re-authentication 130
- dot1x timeout 132
- duplex 134
- errdisable detect cause 136
- errdisable recovery 138
- flowcontrol 140
- hw-module slot 144
- (nonrouting) port 148
- interface port-channel 149
- interface range 150
- • fastethernet interface-id 151
- interleave 152
- ip access-group 154
- ip access-list 156
- ip dhcp snooping 159
- ip dhcp snooping trust 165
- ip dhcp snooping vlan 166
- ip igmp max-groups 168
- IGMP profile number 171
- ip igmp snooping 172
- ip ssh 185
- lacp port-priority 187
- lacp system-priority 189
- lre profile 200
- 1. Per-port sequence 201
- 2. Global sequence 201
- 3. Port profile 201
- 4. Global profile 201
- lre syslog 205
- Switch(config)# lre syslog 205
- lre upbo 206
- Switch# configure terminal 207
- Related Commands 207
- mac access-group 211
- mac access-list extended 213
- mac address-table static 218
- macro apply 222
- macro description 225
- macro global 226
- macro global description 228
- macro name 229
- margin 231
- match 233
- media-type 236
- mls qos cos 238
- mls qos map 239
- mls qos trust 242
- monitor session 245
- mvr immediate 251
- mvr type 253
- pagp learn-method 256
- pagp port-priority 258
- police 265
- policy-map 267
- port-channel load-balance 270
- rate selection 276
- rate selection sequence 279
- rcommand 280
- remote-span 283
- 0L-10102-02 289
- VLAN is configured: 343
- command to display an 465
- • 1000 Mbps—20000 478
- • 100 Mbps—200000 478
- • 10 Mbps—2000000 478
- Switch(config)# udld enable 541
- Switch# vmps reconfirm 563
- Switch(config)# vmps retry 7 564
- Catalyst 2955 Alarm Commands 581
- power-supply dual 590
- show alarm settings 595
- test relay 601
- Switch# test relay major on 601
- Boot Loader Commands 603
- boot 604
- • d—directory 609
- • r—readable 609
- • w—writable 609
- • x—executable 609
- flash_init 610
- format 611
- [-test 612
- help 613
- load_helper 614
- memory 616
- more 618
- rename 619
- rmdir 621
- type 625
- unset 626
- APPENDIX 629
- debug auto qos 631
- debug dot1x 632
- debug etherchannel 633
- debug lre 634
- debug pagp 635
- debug pm 636
- debug spanning-tree 638
- debug spanning-tree bpdu 641
- debug spanning-tree mstp 643
- debug switch dhcp 648
- debug sw-vlan 649
- debug sw-vlan ifs 651
- debug sw-vlan vtp 654
- debug udld 656
- Numerics 659
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Table of contents
Contents
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Audience
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Overview
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Mounting and
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DATA & PWR
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Controls
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Security
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Glossary
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802.11i
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