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Catalyst 2950 and Catalyst 2955 Switch Command Reference
OL-10102-02
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
ip dhcp snooping
ip dhcp snooping
Use the ip dhcp snooping global configuration command to globally enable DHCP snooping. Use the
no form of this command to return to the default setting.
ip dhcp snooping
no ip dhcp snooping
Syntax Description This command has no arguments or keywords.
Defaults DHCP snooping is disabled.
Command Modes Global configuration
Command History
Usage Guidelines You must globally enable DHCP snooping for any DHCP snooping configuration to take effect.
DHCP snooping is not active until snooping is enabled on a VLAN by using the ip dhcp snooping vlan
vlan-id global configuration command.
Examples This example shows how to enable DHCP snooping:
Switch(config)# ip dhcp snooping
You can verify your settings by entering the show ip dhcp snooping privileged EXEC command.
Related Commands
Release Modification
12.1(19)EA1 This command was introduced.
Command Description
ip dhcp snooping vlan Enables DHCP snooping on a VLAN.
show ip dhcp snooping Displays the DHCP snooping configuration.
show ip dhcp snooping binding Displays the DHCP snooping binding information.
- 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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