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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
ip dhcp snooping database
Usage Guidelines The DHCP snooping binding database can have up to 8192 bindings.
To ensure that the lease time in the database is accurate, we recommend that Network Time Protocol
(NTP) is enabled and configured for these features:
• NTP authentication
• NTP peer and server associations
• NTP broadcast service
• NTP access restrictions
• NTP packet source IP address
If NTP is configured, the switch writes binding changes to the binding file only when the switch system
clock is synchronized with NTP.
Because both NVRAM and the flash memory have limited storage capacity, we recommend that you
store a binding file on a TFTP server. You must create an empty file at the configured URL on
network-based URLs (such as TFTP and FTP) before the switch can write bindings to the binding file at
that URL for the first time.
Use the no ip dhcp snooping database command to disable the agent.
Use the no ip dhcp snooping database timeout command to reset the timeout value.
Use the no ip dhcp snooping database write-delay command to reset the write-delay value.
Examples This example shows how to store a binding file at an IP address of 10.1.1.1 that is in a directory called
directory. A file named file must be present on the TFTP server.
Switch(config)# ip dhcp snooping database tftp://10.1.1.1/directory/file
You can verify your settings by entering the show ip dhcp snooping database privileged EXEC
command.
Related Commands Command Description
ip dhcp snooping Enables DHCP snooping on a VLAN.
ip dhcp snooping binding Configures the DHCP snooping binding database.
show ip dhcp snooping database Displays the status of DHCP snooping database agent.
- 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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