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command to stop the DHCP message forwarding. The command “no ip dhcp relay
information policy drop” restores the DHCP message forwarding.
Default: DHCP relay forwards DHCP broadcasting messages by default.
Command mode: Global Mode
Usage Guide: When DHCP messages shouldn’t be forwarded for certain reasons, this
command can be used to stop the forwarding.
Example: Disable DHCP broadcasting messages forwarding function.
Switch(Config)# ip dhcp relay information policy drop
11.4 DHCP Configuration Example
Scenario 1:
Too save configuration efforts of network administrators and users, a company is using
ES4626/ES4650 as a DHCP server. The Admin VLAN IP address is 10.16.1.2/16. The
local area network for the company is divided into network A and B according to the
office locations. The network configurations for location A and B are shown below.
PoolA(network 10.16.1.0) PoolB(network 10.16.2.0)
Device IP address Device IP address
Default gateway 10.16.1.200
10.16.1.201
Default gateway 10.16.1.200
10.16.1.201
DNS server 10.16.1.202 DNS server 10.16.1.202
WINS server 10.16.1.209 WINS server 10.16.1.209
WINS node type H-node WINS node type H-node
Lease 3 days Lease 3 days
In location A, a machine with MAC address 00-03-22-23-dc-ab is assigned with a fixed IP
address of 10.16.1.210 and named as “management”. (The interfaces in the following
configurations are wrong; "no switch" command is not available.)
Switch(Config)#service dhcp
Switch(Config)#interface vlan 1
Switch(Config-Vlan-1)#ip address 10.16.1.2 255.255.0.0
Switch(Config-Vlan-1)#exit
Switch(Config)#ip dhcp pool A
Switch(dhcp-A-config)#network 10.16.1.0 24
Switch(dhcp-A-config)#lease 3
Switch(dhcp-A-config)#default-route 10.16.1.200 10.16.1.201