DES-3500 Layer 2 Fast Ethernet Switch CLI Reference Manual
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config filter dhcp_server
Purpose
DHCP server packets eccept 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.
Syntax
config filter dhcp_server [add permit server_ip <ipaddr> clent_mac
<macaddr> ports [<portlist>|all] | delete permit server_ip <ipaddr>
[client_mac <macaddr>|all] | ports [<portlist>|all] state
[enable|disable]]
Description
This command has two purposes: To filter all DHCP server packets on the
specified port(s) and to allow some DHCP server packets to be 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 a
network.
Parameters
ippaddr –
The IP address of the DHCP server to be filtered
macaddr –
The MAC address of the DHCP client.
state –
Enable/Disable the DHCP filter state
ports <portlist>
– The port number to which the DHCP filter will be applied.
Restrictions
Only Administrator and Operator-level users can issue this command.
Enabling the DHCP filter will create one access profile and create one
access rule per port (UDP port 67).
Addition of a DHCP filter permit entry will create one access profile and
create one access rule (DA = client MAC address, SA = source IP address
and UDP port 67).
Example usage:
To add an entry from the DHCP server/client filter list in the switch’s database:
DES-3500:admin#config filter dhcp_server add permit_server_ip
10.1.1.1 client_mac 00-00-00-00-00-01 port 1-26
Command: config filter dhcp_server add permit_server_ip 10.1.1.1
client_mac 00-00-00-00-00-01 port 1-26
Success
DES-3500:admin#
To configure the DHCP filter state:
DES-3500:admin#config filter dhcp_server ports 1-10 state enable
Command: config filter dhcp_server ports 1-10 state enable
Success
DES-3500:admin#
show filter dhcp_server
Purpose
Used to display current DHCP server/client filter list created on the switch.
Syntax
show dhcp_server
Description
This command is used to display DHCP server/client filter list created on the
switch.
