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Configuring Advanced Threat Protection

DHCP Snooping

ProCurve(config)# dhcp-snooping verify mac

ProCurve(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

Figure 10-7. 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.

10-11

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