Specifications

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.3.0XO(15.1(1)XO)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
ip dhcp snooping database
ip dhcp snooping databas e
To store the bindings that are generate d by DHCP snooping, use the ip dhcp snooping database
command. To either reset the timeout, reset the write-delay, or delete the agent specified by the URL,
use the no form of this command.
ip dhcp snooping database {url | timeout seconds | write-delay seconds}
no ip dhcp snooping database {timeout | write-delay}
Syntax Description
Defaults T he timeout value is set to 300 seconds (5 minutes).
The write-delay value is set to 300 se conds.
Command Modes Interface configuration mode
Usage Guidelines You ne ed to create an empty file at the conf igured URL on n etwork-ba sed URLs (suc h as TFTP a nd FTP)
before the switch can write the set of bindings for the first time at the URL.
Note Because both NVRAM and bootflash have limited storage capacity, using TFTP or network-based files
is recommended . If you use flash to st ore the database file, new upd ates (by the agent) result i n the
creation of new files (flash fills quickly). In addition, due to the nature of the file system used on the
flash, a large number of files causes access to be considerably slowed. When a file is stored in a remote
location accessible through TF TP, an RPR/ SSO standby superviso r engine can take ove r the bindi ng list
when a switchover occurs.
url Specifies the URL in one of the following forms:
• tftp://<host>/<filename>
• ftp://<user>:<password>@<host>/<filename>
• rcp://<user>@<host>/<filename>
• nvram:/<filename>
• boot flash:/<filena me>
timeout seconds Specifies when to abort the database transfer process after a change to the binding
database.
The minimum value of the delay is 15 seconds. 0 is defined as an infinite duration.
write-delay
seconds
Specifies the duration for which the transfer should be delayed after a change to
the binding database.