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Utility Commands AT8902M

AT8902M CLI Reference Manual Page 5 - 42

5.9 DHCP Filtering

You can configure the DHCP Filtering feature as a security measure against

unauthorized DHCP servers. DHCP filtering works by allowing you to configure each

port as either a trusted port or an untrusted port. To optimize the DHCP filtering

feature, configure the port that is connected to an authorized DHCP server on your

network as a trusted port. Any DHCP responses received on a trusted port are

forwarded. Make sure that all other ports are untrusted so that any DHCP (or BootP)

responses received are discarded.

You can configure DHCP filtering on physical ports and LAGs. DHCP filtering is not

operable on VLAN interfaces.

5.9.1 ip dhcp filtering

This command enables DHCP filtering globally.

Default

disabled

Format ip dhcp filtering

Mode Global Config

5.9.1.1 no ip dhcp filtering

This command disables DHCP filtering.

Format

no ip dhcp filtering

Mode Global Config

5.9.2 ip dhcp filtering trust

This command configures an interface as trusted.

Default

untrusted

Format ip dhcp filtering trust

Mode Interface Config

5.9.2.1 no ip dhcp filtering trust

This command returns an interface to the default value for DHCP filtering.

Format

no ip dhcp filtering trust

Mode Interface Config

5.9.3 show ip dhcp filtering

This command displays the DHCP filtering configuration.

Format

show ip dhcp filtering

Mode Privileged EXEC

Interface The interface by slot/port.

Trusted Indicates whether the interface is trusted or untrusted.

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Kontron AT8902M CLI Bedienungsanleitung Seite 242