Configuring a Device to Delete Dynamic ARP Entries after a Delay

When a VLANIF interface serves as a gateway, the network planners usually deploy a ring or dual-homing network to improve network reliability. If a faulty link causes an interface in a VLAN to go Down, the device immediately deletes dynamic ARP entries learned by the interface and updates and relearns ARP entries through newly sent user traffic. However, if many users are connected to the gateway, user traffic may be interrupted for a long time due to the affected performance in relearning ARP entries.

To minimize the service interruption time and accelerate user traffic convergence, network administrators can enable the device to delete dynamic ARP entries after a delay if an interface in a VLAN goes Down. After this function is enabled, the device does not immediately delete dynamic ARP entries learned by the interface after it goes Down. Instead, it sends ARP detection packets and then deletes or updates ARP entries depending on whether it receives ARP reply packets within the ARP aging time.