11-11
Configuring Advanced Threat Protection
DHCP Snooping
Figure 11-7. Example Showing the DHCP Snooping Verify MAC Setting
The DHCP Binding Database
DHCP snooping maintains a database of up to 8192 DHCP bindings on
untrusted ports. Each binding consists of:
■ Client MAC address
■ Port number
■ VLAN identifier
■ Leased IP address
■ Lease time
The switch can be configured to store the bindings at a specific URL so they
will not be lost if the switch is rebooted. If the switch is rebooted, it will read
its binding database from the specified location. To configure this location use
this command.
Syntax: [no] dhcp-snooping database [file<tftp://<ip-address>/<ascii-string>>]
[delay<15-86400>][ timeout<0-86400>]
file Must be in Uniform Resource Locator (URL)
format — “tftp://ip-address/ascii-string”. The
maximum filename length is 63 characters.
delay Number of seconds to wait before writing to the
database. Default = 300 seconds.
timeout Number of seconds to wait for the database file
transfer to finish before returning an error. A
value of zero (0) means retry indefinitely.
Default = 300 seconds.
HP Switch(config)# dhcp-snooping verify mac
HP Switch(config)# show dhcp-snooping
DHCP Snooping Information
DHCP Snooping : Yes
Enabled Vlans : 4
Verify MAC : yes
Option 82 untrusted policy : drop
Option 82 Insertion : Yes
Option 82 remote-id : subnet-ip
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