Dhcp Server Screening Commands; Config Filter Dhcp_Server - D-Link DGS-1210/ME series Reference Manual

The DHCP server screenint commands in the Command Line Interface (CLI) are listed (along with the
appropriate parameters) in the following table.
Due to this function allow you not only to restrict all DHCP Server packets but also to receive any
specified DHCP server packet by any specified DHCP client, it is useful when one or more than one
DHCP servers are present on the network and both provide DHCP services to different distinct groups of
clients.
When DHCP Server Screening function is enabled, all DHCP Server packets will be filtere from a specif ic port.
Also, you are allow to create entries for specific Server IP address an d Client MAC address bi nding by por t-
based. Be aware th a tthe DHCP Ser ver Screen ing f uncti n must b e enabled first On ce all sett ng is do ne, all
DHC P Serve packe s wi ll be filtered fro m a speci fic port e cep t those tha meet th e Se ver IP Ad dres s and
Cli ent M AC Address binding .
Command
config filter
dhcp_server
config filter
dhcp_server
show filter dhcp_server
show dhcp_server
screening
Each command is listed in detail, as follows:

config filter dhcp_server

Purpose
Syntax
Description
Parameters
DGS-1210 Metro Ethernet Managed Switch CLI Reference Guide

DHCP SERVER SCREENING COMMANDS

Parameter
[add permit server_ip <ipaddr> { client_mac <macaddr>} ports [ <portlist> | all ] |
delete permit server_ip <ipaddr> { client_mac <macaddr> } {ports <portlist> state
[ enable | disable]}
illegal_server_log_suppress_duration [1min | 5min | 30min]
DHCP server packets except those that have been IP/client MAC
bound will be filtered. This command is used to configure the state of
the function for filtering of DHCP server packet and to add/delete the
DHCP server/client binding entry.
config filter dhcp_server [add permit server_ip <ipaddr>
{ client_mac <macaddr>} ports [ <portlist> | all ] | delete permit
server_ip <ipaddr> { client_mac <macaddr> } {ports <portlist>
state [ enable | disable]}
The config filter dhcp_server command has two purposes: To filter
all DHCP server packets on the specified port(s) and to allow some
DHCP server packets to forwarded if they are on the pre-defined
server IP address/MAC address binding list. Thus the DHCP server
can be restricted to service a specified DHCP client. This is useful
when there are two or more DHCP servers present on f network.
<ipaddr> – The IP address of the DHCP server to be filtered
client_mac <macaddr> – The MAC address of the DHCP client.
ports <portlist> – The port number to which the DHCP filter will be
applied.
state – Enable/Disable the DHCP filter state.
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