Proxy ARP configuration on S series switch

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An S series switch, except S1700, supports the following proxy ARP: routed proxy ARP, intra-VLAN proxy ARP, and inter-VLAN proxy ARP, which are configured using the arp-proxy enable, arp-proxy inner-sub-vlan-proxy enable, and arp-proxy inter-sub-vlan-proxy enable commands respectively.
Routed proxy ARP (available on all models in V2R5 and later versions, but unavailable on S275x and S5700LI in the versions earlier than V2R5)
The destination IP address in the received ARP request packet and the IP address of the inbound interface are in different subnets, but there is a route to the destination IP address and the outbound/inbound interfaces of the route are different. Routed proxy ARP takes effect in this situation. The switch uses its MAC address as the source MAC address to return ARP reply packets.
Intra-VLAN proxy ARP (available on all models in V2R5 and later versions, but unavailable on S275x and S5700LI in the versions earlier than V2R5)
If the destination IP address of the received ARP request packet and the IP address of the inbound interface are in the same subnet, intra-VLAN proxy ARP takes effect.
Inter-VLAN proxy ARP (unavailable on S1720, S2720, S275x, S5700LI and E series switches)
It is similar to intra-VLAN proxy ARP. Inter-VLAN proxy ARP takes effect only on super VLAN. If the destination IP address of the received ARP request packet and the IP address of the inbound interface are in the same subnet, inter-VLAN proxy ARP takes effect. If the source and destination are in the same VLAN, inter-VLAN proxy ARP is not required.
Regardless of which type of proxy ARP is used, the destination IP address of the received ARP request packet and the IP address of the inbound interface must be in the same subnet.

Other related questions:
Proxy ARP support on S series switches
Proxy ARP support on S series switches is as follows: # Routed proxy ARP: In versions earlier than V200R005, this feature is supported by all models except the S275x or S5700LI. In V200R005 and later versions, this feature is supported by all models. # Intra-VLAN proxy ARP: In versions earlier than V200R005, this feature is supported by all models except the S275x or S5700LI. In V200R005 and later versions, this feature is supported by all models. # Inter-VLAN proxy ARP: This feature is supported by all models except S1720, S2720, S275x, and S5700LI of S series fixed switches.

Precautions for enabling intra-VLAN proxy ARP and inter-VLAN proxy ARP on S series switches
For S series switches (except S1700 switches): Different from routed proxy ARP, intra-VLAN proxy ARP and inter-VLAN proxy ARP check whether VLAN information at both ends complies with proxy requirements based on the ARP entries of source and destination IP addresses. Therefore, if the ARP entry of a destination IP address does not exist, the device broadcasts an ARP Request packet to all devices on the VLAN (including all sub VLANs in the super VLAN) to request them to learn this ARP entry. If the proxy function is enabled on multiple switches on a network but the destination IP address does not exist, the ARP broadcast packet will trigger the same proxy process on other switches, and a severe broadcast storm may occur.

Whether proxy ARP on interfaces of S series switches takes effect on gratuitous ARP packets
On S series switches (except S1700 switches), proxy ARP on interfaces does not take effect on gratuitous ARP packets.

Static ARP configuration on S series switch
On an S series switch, except S1700, run the arp static command in the system view to configure a static ARP entry. When the outbound interface is an Ethernet interface, run the arp static ip-address mac-address interface interface-type interface-number command to configure a static ARP entry. When a VPN instance needs to be specified for the ARP entry, run the arp static ip-address mac-address vpn-instance vpn-instance-name command. To configure a short ARP entry (only contains IP address and MAC address mapping, without VLAN or outbound interface), run the arp static ip-address mac-address command. To configure a static ARP entry in which the IP address is 10.1.1.1, MAC address is 0efc-0505-86e3, VLAN ID is 10, and outbound interface is GE1/0/1, run: [HUAWEI] arp static 10.1.1.1 0efc-0505-86e3 vid 10 interface gigabitethernet 1/0/1 - To configure a static ARP entry in which the IP address is 10.1.1.1, MAC address is 0efc-0505-86e3, and VPN instance is vpn1, run: [HUAWEI] ip vpn-instance vpn1 [HUAWEI-vpn-instance-vpn1] ipv4-family [HUAWEI-vpn-instance-vpn1-af-ipv4] quit [HUAWEI-vpn-instance-vpn1] quit [HUAWEI] arp static 10.1.1.1 0efc-0505-86e3 vpn-instance vpn1

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