DES-1228/ME Layer 2 Metro Ethernet Switch CLI Reference Manual
145
To add an IP destination to the DHCP relay table:
DES-1228/ME:4#config dhcp_relay add ipif System 10.58.44.6
Command: config dhcp_relay add ipif System 10.58.44.6
Success.
DES-1228/ME:4#
config dhcp_relay delete ipif
Purpose
Used to delete one or all IP destination addresses from the Switch's DHCP/BOOTP relay
table.
Syntax
config dhcp_relay delete ipif System <ipaddr>
Description
This command is used to delete an IP destination addresses in the Switch’s
DHCP/BOOTP relay table.
Parameters
System
−
The name of the IP interface that contains the IP address below.
<ipaddr>
−
The DHCP server IP address.
Restrictions
Only Administrator-level users can issue this command.
Example usage:
To delete an IP destination from the DHCP relay table:
DES-1228/ME:4#config dhcp_relay delete ipif System 10.58.44.6
Command: config dhcp_relay delete ipif System 10.58.44.6
Success.
DES-1228/ME:4#
config dhcp_relay option_82 state
Purpose
Used to configure the state of DHCP relay agent information option 82 of the switch.
Syntax
config dhcp_relay option_82 state [enable | disable]
Description
This command is used to configure the state of DHCP relay agent information option 82 of
the switch.
Parameters
enable
−
When this field is toggled to
Enabled
the relay agent will insert and remove
DHCP relay information (option 82 field) in messages between DHCP server and client.
When the relay agent receives the DHCP request, it adds the option 82 information, and
the IP address of the relay agent (if the relay agent is configured), to the packet. Once the
option 82 information has been added to the packet it is sent on to the DHCP server.
When the DHCP server receives the packet, if the server is capable of option 82, it can
implement policies like restricting the number of IP addresses that can be assigned to a
single remote ID or circuit ID. Then the DHCP server echoes the option 82 field in the
DHCP reply. The DHCP server unicasts the reply to the back to the relay agent if the
request was relayed to the server by the relay agent. The switch verifies that it originally
inserted the option 82 data. Finally, the relay agent removes the option 82 field and
forwards the packet to the switch port that connects to the DHCP client that sent the
DHCP request.
disable
−
If the field is toggled to
disable
the relay agent will not insert and remove DHCP
relay information (option 82 field) in messages between DHCP servers and clients, and
the check and policy settings will have no effect.
Restrictions
Only Administrator-level users can issue this command.
