SNR S2940-8G-v2 Switch Configuration Guide
DHCP option 82 Configuration
max-lease-time 86400; #24 Hours
allow members of "Switch3Vlan2Class2";
}
}
Now, the DHCP server will allocate addresses for the network nodes from Switch1 which are
relayed by Switch3 within the range of 192.168.102.21 ∼ 192.168.102.50, and allocate addresses
for the network nodes from Switch1 within the range of 192.168.102.51 ∼ 192.168.102.80.
36.4 DHCP option 82 Troubleshooting
• DHCP option 82 is implemented as a sub-function module of DHCP Relay Agent. Before
using it, users should make sure that the DHCP Relay Agent is configured correctly.
• DHCP option 82 needs the DHCP Relay Agent and the DHCP server cooperate to finish
the task of allocating IP addresses. The DHCP server should set allocating policy correctly
depending on the network topology of the DHCP Relay Agent, or, even the Relay Agent can
operate normally, the allocation of addresses will fail. When there is more than one kind of
Relay Agent, please pay attention to the retransmitting policy of the interface DHCP request
messages.
• To implement the option 82 function of DHCP Relay Agent, the 'debug dhcp relay packet'
command can be used during the operating procedure, including adding the contents of
option 82, the retransmitting policy adopted, the option 82 contents of the server peeled by
the Relay Agent and etc., such information can help users to do troubleshooting.
• To implement the option 82 function of DHCP server, the 'debug ip dhcp server packet' com-
mand can be used during the operating procedure to display the procedure of data packets
processing of the server, including displaying the identified option 82 information of the re-
quest message and the option 82 information returned by the reply message.
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