ARP Proxy on a VPLS Network

To prevent bogus ARP packets at the Pseudo Wire (PW) side from being broadcast to the Attachment Circuit (AC) side on a VPLS network, enable ARP proxy and DHCP snooping over VPLS on a PE.

ARP packets at the PW side are sent to the CPU:

• If the ARP packets are ARP Request packets and the destination IP addresses in the packets match DHCP snooping binding entries, the device constructs ARP Reply packets based on the DHCP snooping binding entries. The device then sends the ARP Reply packets to the requester at the PW side.
• If the ARP packets are not ARP Request packets or the destination IP addresses in the packets do not match a DHCP snooping binding entry, the device forwards these ARP packets to the destination.

Only the S5720-HI, S5730-HI, S5731-H, S5731S-H, S5732-H, S6720-HI, S6730S-H, and S6730-H support this function.