arp speed-limit flood-rate
Function
The arp speed-limit flood-rate command sets the maximum rate of broadcasting ARP Request packets on VLANIF interfaces in all super-VLANs.
The undo arp speed-limit flood-rate command restores the default maximum rate of broadcasting ARP Request packets on VLANIF interfaces in all super-VLANs.
By default, the maximum rate of broadcasting ARP Request packets on VLANIF interfaces in all super-VLANs is 256 pps.
Usage Guidelines
A VLANIF interface in a super-VLAN is triggered to learn ARP entries in the following scenarios:
- The VLANIF interface receives IP packets triggering ARP Miss messages.
- The VLANIF interface is enabled with ARP proxy and receives ARP packets whose destination IP addresses meet the proxy requirements and match no ARP entry.
The VLANIF interface replicates ARP Request packets in each sub-VLAN when learning ARP entries. If a large number of sub-VLANs are configured for the super-VLAN, the device generates a large number of ARP Request packets. As a result, the CPU is busy processing ARP Request packets, and other services are affected. To prevent this problem, limit the rate of ARP packets on the VLANIF interface of a super-VLAN.
When the CPU is busy processing packets, set the maximum rate of broadcasting ARP Request packets to a small value. When the CPU is idle, set the maximum rate of broadcasting ARP Request packets to a large value to broadcast packets efficiently. You can set the maximum rate of broadcasting ARP Request packets based on the actual network environment.
