After Address Resolution Protocol (ARP) entry limit is enabled, the device limits the number of ARP entries that an interface can learn, to prevent ARP entry overflow and improve ARP entry security.
If a device receives excessive ARP packets in a short period, the device's buffer will overflow, interrupting services of authorized users. This problem can be solved by configuring an ARP entry limit on the device. After ARP entry limit is configured, the device limits the number of ARP entries that each interface can learn, preventing ARP entry overflow and improving ARP entry security.
Ethernet, GE, and Eth-Trunk interfaces can be Layer 2 or Layer 3 interfaces. vlan-id cannot be configured for Layer 3 interfaces, but must be configured for Layer 2 interfaces.
Ethernet, GE, and Eth-Trunk sub-interfaces can be common sub-interfaces or QinQ termination sub-interfaces. When the sub-interfaces are common sub-interfaces, vlan-id cannot be configured for common sub-interfaces, but must be configured for QinQ termination sub-interfaces. vlan-id indicates the outer virtual local area network (VLAN) ID of a QinQ termination sub-interface.