QTECH QSW-3400 Инструкция по настройке - Manual (Page 230)

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no ip forward-protocol udp bootps packet forwarding.
Interface Configuration Mode
ip helper-address <ipaddress>
no ip helper-address <ipaddress>
Set the destination IP address for DHCP relay
forwarding;
the “no ip helper-address
<ipaddress>“command cancels the setting.
3. Configure share-vlan
When the user want to use layer 2 device as DHCP relay, there is the number limitation that
create layer 3 interface on layer 2 device, but using the layer 3 interface of share-vlan (it may
include many sub-vlan, however a sub-vlan only correspond to a share-vlan) can implement
DHCP relay forwarding, and the relay device needs to enable option82 function at the same
time.
Command Explanation
Global Mode
ip dhcp relay share-vlan <vlanid>
sub-vlan <vlanlist>
no dhcp relay share-vlan
Create or delete share-vlan and it's sub-vlan.
29.4 DHCP Configuration Examples
Scenario 1:
Too save configuration efforts of network administrators and users, a company is using switch
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 WWW server 10.16.1.209
WINS node type H-node
Lease 3 days Lease 1day
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”.