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4 Configuration

DGS-1210 series Metro Ethernet Managed Switch User Manual

DHCP Relay Agent Information Option 82 Check:

This field can be toggled between Enabled and

Disabled using the pull-down menu. It is used to enable or disable the Switches ability to check the validity of
the packet’s option 82.

Enabled –

When the field is toggled to

Enabled

, the relay agent will check the validity of the packet’s

option 82 fields. If the switch receives a packet that contains the option-82 field from a DHCP client,
the switch drops the packet because it is invalid. In packets received from DHCP servers, the relay
agent will drop invalid messages.

Disabled -

When the field is toggled to Disabled, the relay agent will not check the validity of the

packet’s option 82 fields.

DHCP Relay Agent Information Option 82 Policy:

This field can be toggled between Replace, Drop, and

Keep by using the pull-down menu. It is used to set the Switches policy for handling packets when the

DHCP

Agent Information Option 82 Check

is set to Disabled. The default is

Replace

Replace -

The option 82 field will be replaced if the option 82 field already exists in the packet

received from the DHCP client.

Drop -

The packet will be dropped if the option 82 field already exists in the packet received from the

DHCP client.

Keep -

The option 82 field will be retained if the option 82 field already exists in the packet received

from the DHCP client.

DHCP Relay Agent Information Option 82 Remote ID:

This field can be toggled between Default and User

Define.

DHCP Relay Agent Information Option 82 Circuit ID Type:

This field can be toggled between Default,

User Define, User Define Hex, vendor1, vendor2, vendor3, vendor4, vendor5 and vendor6.

NOTE:

If the Switch receives a packet that

contains the option-82 field from a DHCP client
and the information-checking feature is enabled,
the switch drops the packet because it is invalid.
However, in some instances, you might configure
a client with the option-82 field. In this situation,
you should disable the information-check feature
so that the switch does not remove the option-82
field from the packet. You can configure the action
that the switch takes when it receives a packet
with existing option-82 information by configuring
the

DHCP Agent Information Option 82 Policy

Configuration > DHCP/BOOTP Relay > DHCP/BOOTP Relay Interface Settings

This page allows the user to set up a server, by IP address, for relaying DHCP/BOOTP information the
switch. The user may enter a previously configured IP interface on the Switch that will be connected directly
to the DHCP/BOOTP server using the following window. Properly configured settings will be displayed in the

BOOTP Relay Table

at the bottom of the following window, once the user clicks the

Add

button under the

Apply

heading. The user may add up to four server IPs per IP interface on the Switch. Entries may be

deleted by clicking Delete button.

Figure 4.94 - Configuration > DHCP/BOOTP Relay > DHCP/BOOTP Relay Interface Settings

Interface

: The IP interface on the Switch that will be connected directly to the Server.

Server

IP: Enter the IP address of the DHCP/BOOTP server. Up to four server IPs can be configured per IP