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3com S7906E Manuel De Montage

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5-3 
To save system resources, you can disable the trusted ports, which are indirectly connected to DHCP 
clients, from recording clients’ IP-to-MAC bindings upon receiving DHCP requests.  
Figure 5-2 Configure trusted ports in a cascaded network 
  
 
 describes roles of the ports shown in 
. 
Table 5-1 Roles of ports 
Device 
Untrusted port 
Trusted port disabled from 
recording binding entries 
Trusted port enabled to 
record binding entries 
Switch A 
GigabitEthernet2/0/1 
GigabitEthernet2/0/3 
GigabitEthernet2/0/2 
Switch B 
GigabitEthernet2/0/3 and 
GigabitEthernet2/0/4 
GigabitEthernet2/0/1 GigabitEthernet2/0/2 
Switch C 
GigabitEthernet2/0/1 
GigabitEthernet2/0/3 and 
GigabitEthernet2/0/4 
GigabitEthernet2/0/2 
 
DHCP Snooping Support for Option 82 
Option 82 records the location information of the DHCP client. The administrator can locate the DHCP 
client to further implement security control and accounting. For more information, refer to 
. 
If DHCP snooping supports Option 82, it will handle a client’s request according to the contents defined 
in Option 82, if any. The handling strategies are described in the table below. 
If a reply returned by the DHCP server contains Option 82, the DHCP snooping device will remove the 
Option 82 before forwarding the reply to the client. If the reply contains no Option 82, the DHCP 
snooping device forwards it directly.