The Address Resolution Protocol (ARP) maps IP addresses to MAC addresses. ARP sets up IP-to-MAC mappings and transmits Ethernet frames over Layer 2 networks based on the mappings.
When static ARP is used, mappings between IP addresses and MAC addresses are configured and cannot be changed on hosts or routers. Static ARP entries are always not aged on routers that are working properly.
Hosts and routers can learn dynamic ARP entries by default. However, you can adjust dynamic ARP aging parameters or optimize the ARP entry update policy.
To check whether a peer device is reachable and to enable a device to learn a peer device's MAC address, configure a local interface to send a unicast ARP request that carries the peer device's IP and MAC addresses as the destination addresses.
The NetEngine 8000 F by default supports ARP-MAC association. This function allows fast updates of ARP entries and effectively guarantee real-time and stable user traffic. However, the VLANIF interface performs synchronization on the host after learning ARP entries. As a result, there are a large number of ARP entries on all interface boards. To resolve the problem, disable ARP-MAC association in scenarios where ARP entry synchronization is not required on the host.