How does an MFF-enabled switch process ARP requests from the network side

When receiving an ARP Request packet, an MFF-enabled switch checks the destination IP address in the packet against the DHCP snooping binding table. If the destination IP address in the packet matches an entry in the DHCP snooping binding table, the switch functions as a DHCP client to response to the request; otherwise, the ARP Request packet is sent to other network-side interfaces.

A DHCP client may not send a DHCP Release message when going offline; therefore, association between ARP and DHCP snooping may be enabled on the upstream gateway device. In this case, if MFF is enabled on the switch, the probe packet sent by the gateway cannot reach the destination because ARP proxy is enabled on the switch. On switches of V100R006 and later version, run the mac-forced-forwarding user-detect transparent command in the VLAN view to solve this problem.

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