The dhcpv6 relay strict-check interface-info command enables a DHCPv6 relay interface to check the physical information of DHCPv6 messages.
The undo dhcpv6 relay strict-check interface-info command disables a DHCPv6 relay interface from checking the physical information of DHCPv6 messages.
By default, DHCPv6 relay interfaces are not allowed to check the physical information of DHCPv6 messages.
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Usage Scenario
If the location of a WLAN user changes, the physical information (user access interface, PE-VLAN ID, and CE-VLAN ID) of DHCPv6 messages from that user will also change. In this case, the DHCPv6 relay agent does not need to check the physical information of DHCPv6 messages.
However, the physical information of DHCPv6 messages from fixed network users does not change unless an error occurs. To allow a DHCPv6 relay interface to check the physical information of DHCPv6 messages for security purposes, run the dhcpv6 relay strict-check interface-info command.Configuration Impact
After this command is run on a DHCPv6 relay interface, the interface checks the physical information of received DHCPv6 messages. If the physical information is different from that in DHCPv6 client entries, the interface discards the messages.