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Figure 10-10 DHCP Server Application

To guarantee the process of assigning IP address fluency and in safety, and to keep the

network run steadily, the DHCP Server function on T3700G-28TQ performs the following tasks.

 Create different IP pool for every VLAN. The device in different VLAN can get the IP address

in different subnet.

 When receiving a DHCP-DISCOVER packet from the client, the switch judges the VLAN

which the ingress port belong to, and chooses the IP in the same subnet with the VLAN

interface to assign to the client.

 With a DHCP Relay running between the client and the server, when receiving a

DHCP-DISCOVER packet transmitting from the Relay, the switch will choose the IP from the

IP pool in the same subnet with the Relay’s IP to assign to the client. If the IP pool is not

configured on the switch or the configured IP pool doesn’t match the Relay’s network

segment, the client may not get network parameters successfully.

 The switch can detect the IP address automatically before assigning it to avoid conflict.



IP Detection

To avoid IP conflict, the switch will detect the IP address to be assigned in LAN through Ping

test.

The DHCP server will send the Ping test packet with the destination IP being the IP address to

be assigned. If the server receives the Reply packet from the destination host in the ping time,

it means that the IP address has been used, and the server will choose another IP as

destination IP to test again. The server will assign the IP address if the server not receives the

Reply packet in the Ping time.



Policy of IP Assignment

The switch chooses the IP assigned to clients based on the rules shown as follows.

1) First, the server will choose the IP which has been bound to the client manually.

2) Then, the server will assign the IP which has been assigned to the client once.

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