Maipu Administration Guide

Brief Introduction of DHCP Snooping Option82

DHCP Snooping supports the adding, forwarding and managing for the Option82. Option82 is one DHCP packet option. The option is used to record the location information of the DHCP client and the administrator can locate the DHCP client

according to the option, so as to perform some security control. For example, control the number of the IP addresses that can be distributed to one port or VLAN. The processing mode of Option82 varies with the DHCP packet type:

After the device receives the DHCP request packet, process the packet according to whether the packet contains the Option82, the processing policy configured by the user and the filling format, and then forward the processed packet to the DHCP server.

Processing flow of Option82

Figure 7-1 Processing flow of Option82

When the device receives the response packet of the DHCP server and if the packet contains the Option82, delete the Option82 and forward to the DHCP client; if the packet does not contain the Option82, directly forward to the DHCP client.

Brief Introduction of DHCP Snooping Option82

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