DHCP L2 Relay Interface Configuration

Use the DHCP L2 Relay Interface Configuration page to enable Layer 2 DHCP (Dynamic Host Configuration Protocol) relay on individual ports. Note that L2 DHCP relay must also be enabled globally on the device. To change the DHCP Layer 2 relay settings for one or more interfaces, select each entry to modify and click Edit. The same settings are applied to all selected interfaces.

To access this page, click Switching > DCHP Snooping > L2 Relay > Interface Configuration in the navigation menu.

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DHCP L2 Relay Interface Configuration Fields

Field Description
Interface The interface associated with the rest of the data in the row. When configuring the settings for one or more interfaces, this field identifies each interface that is being configured.
L2 Relay Mode The administrative mode of Layer 2 relay mode on the interface. When enabled, the interface can act as a DHCP relay agent and add information that the Layer 3 relay agent and DHCP server need to perform their roles in IP address configuration and assignment.
Trust Mode The Layer 2 relay trust mode for the interface, which is one of the following:
  • Trusted: A trusted interface usually connects to other agents or servers participating in the DHCP interaction (for example, other Layer 2 or Layer 3 relay agents or servers). An interface in this mode always expects to receive DHCP packets that include Option 82 information. If Option 82 information is not included, these packets are discarded.
  • Untrusted: An untrusted interface is generally connected to clients. DHCP packets arriving on an untrusted interface are never expected to carry Option 82 and are discarded if they do.

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