happens, a Layer 2 Relay agent can be used to add the information that the Layer 3 Relay agent and
DHCP server need to perform their roles in IP address configuration and assignment.
To access this page, click
Switching
>
DCHP Snooping
>
L2 Relay
>
Global
in the navigation menu.
Table 189: DHCP L2 Relay Global Configuration Fields
Field
Description
Admin Mode
The global mode of DHCP Layer 2 relay on the device. When enabled, the device
can act as a DHCP Layer 2 relay agent. This functionality must also be enabled
on each port you want this service to operate on.
Click
Refresh
to refresh the page with the most current data from the switch.
DHCP L2 Relay Interface Configuration
Use the DHCP L2 Relay Interface Configuration page to enable Layer 2
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.
Table 190: 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.
Click
Refresh
to refresh the page with the most current data from the switch.
DHCP L2 Relay VLAN Configuration
Use the DHCP L2 Relay VLAN Configuration page to control the
Layer 2 relay settings on a
particular VLAN. The VLAN is identified by a service VLAN ID (S-VID), which a service provider uses to
Configuring Switching Information
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