Alcatel Carrier Internetworking Solutions Switch/Router 用户手册

Page 26-8

Because the clients in group 3 are not on the same segment as the 

DHCP

 server, they must 

request an 

IP

 address via the 

BOOTP

 relay routing entity in the switch. When a 

DHCP

 request 

frame is received by the 

BOOTP

 relay entity, it will be forwarded from group 3 to group 2. All 

the 

DHCP

-ready clients in group 3 must be members of the same 

VLAN

, and the switch must 

have the 

BOOTP

 relay function configured. 

This application example has a single group in a network with a mix of 

DHCP

-ready and non-

DHCP

 clients. 

DHCP

-ready and non-

DHCP

 clients can coexist in the same network, group, or 

segment. There are two types of AutoTracker policies defined within the group—IP address 
and IP protocol. 

Whenever AutoTracker receives an 

IP

 frame, it examines the frame for an 

IP

 network layer 

policy match. In the case of 

DHCP

, the client generates an IP frame without an IP address. 

Without an IP address, AutoTracker will not be able to place the client into a 

VLAN

 based on 

IP address. Therefore, the client will become a member of the 

VLAN

 defined by a general IP 

Protocol policy (i.e., 

VLAN 30

). 

12345678

123456

IP

 Network 130.0.0.0

IP

 Network 125.0.0.0

IP

 Protocol Policy

125.0.0.1

140.0.0.2

130.0.0.11

130.0.0.12

140.0.0.22

130.0.0.13

140.0.0.20

130.0.0.14

130.0.15