Qtech QSW-2910-09T-POE-AC/DC [61/212] Chapter 4 dhcp configuration

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Chapter 4 DHCP Configuration

4.1 Brief introduction of DHCP

DHCP messages are usually broadcast packets. So to use DHCP to allocate IP for hosts in a

three-level architectured network, there need be a DHCP server in every broadcast domain. In

a three-level architectured network constructed with QTECH 3650, a DHCP server is put in

each VLAN. This is a greate waste of resources. A solution to this is to use the DHCP relay

feature of S3200-24T, which relays DHCP messages to DHCP servers. Thus only one DHCP

server is needed at least.

The system support following DHCP features:

 DHCP Relay;

 Configure DHCP servers for every VLAN;

 DHCP client

4.2 DHCP Configuration

4.2.1 DHCP Configuration list

DHCP Configuration list is as following:

 Enable DHCP Relay

 Configure DHCP server for each VLAN

 option82

4.2.2 Enable DHCP relay

By default, DHCP relay is disabled. To enable DHCP relay, use the following command:

 Enable DHCP relay

dhcp-relay

 Disable DHCP relay

no dhcp-relay

To show DHCP relay status, try the command in any configuration mode:

 Show DHCP relay status

show dhcp-relay

Example: