ARP rate limiting on S series switch

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An S series switch, except S1700, can limit the rate of ARP packets and ARP Miss messages.
When the switch receives many ARP packets, configure ARP packet rate limiting to prevent CPU overloading.
When the switch receives many IP packets of which the destination IP addresses cannot be resolved, the switch generates a large number of ARP Miss messages, delivers temporary ARP entries and sends may ARP request packets to the destination network. This increases CPU load and consumes bandwidth. To avoid IP packet attacks, configure ARP Miss rate limiting on the switch.

Other related questions:
ARP learning rate limiting on S series switch
The S series switches, except S1700, use different ARP learning rates: S series fixed switches: The default CIR value for ARP request and reply packets is 64. Assume that the packet length is 60 bytes. The ARP learning rate can reach 100 pps. When the CIR value is increased to 500, the rate can reach 200 pps, with the CPU usage lower than 60%. The rate of ARP learning triggered by ARP Miss packets is lower than 50 pps. The tested rate is 30 pps. S series modular switches: A test assumes that the default CPCAR settings (128 kbps for MPU and 64 kbps for LPU) are used, the CPU usage is lower than 50%, and the packet length is 60 bytes. The tested rate of ARP request and reply packets is 100 pps. When the CPCAR values are increased, the rate of received ARP request packets is 1000 pps and the rate of received ARP reply packets is 500 pps. The rate of ARP learning triggered by ARP Miss packets is lower than 50 pps. The tested rate is 30 pps.

How to configure ARP packet rate limit on S series switcheses
For S series switcheses (except S1700 switches): You can configure the rate limit on ARP packets in one of the following methods as required: - Limiting the rate on ARP packets based on source MAC addresses (supported by the S5720EI, S5720HI, S6720EI, and all S series modular switches, but not supported by E series switches) # Set the maximum rate of ARP packets from the specified MAC address 0-0-1 to 50 pps. [HUAWEI] arp speed-limit source-mac 0-0-1 maximum 50 - Limiting the rate on ARP packets based on source IP addresses # Set the maximum rate of ARP packets from the specified IP address 10.0.0.1 to 50 pps. [HUAWEI] arp speed-limit source-ip 10.0.0.1 maximum 50 Limiting the rate on ARP packets globally, in a VLAN, or on an interface # Configure Layer 2 interface GE0/0/1 to allow 200 ARP packets to pass through in 10 seconds, and to discard all ARP packets in 60 seconds when the number of ARP packets exceeds the limit. [HUAWEI] interface gigabitethernet 0/0/1 [HUAWEI-GigabitEthernet0/0/1] arp anti-attack rate-limit enable [HUAWEI-GigabitEthernet0/0/1] arp anti-attack rate-limit packet 200 interval 10 block-timer 60 - Limiting the rate on ARP packets on a VLANIF interface of a super-VLAN # Set the maximum rate of broadcasting ARP Request packets on VLANIF interfaces in all super-VLANs to 500 pps. [HUAWEI] arp speed-limit flood-rate 500

How to configure ARP Miss message rate limit on S and E series switches
For S and E series switches (except S1700 switches): You can configure the rate limit on ARP Miss messages in one of the following methods as required (supported by the S5720SI/S5720S-SI, S5720EI, S5720HI, S6720EI, and all S series modular switches, but not supported by E series switches): - Limiting the rate on ARP Miss messages based on source IP addresses # Set the maximum number of ARP Miss messages triggered by the IP address 10.0.0.1 to 100, and by other source IP addresses to 60. [HUAWEI] arp-miss speed-limit source-ip maximum 60 [HUAWEI] arp-miss speed-limit source-ip 10.0.0.1 maximum 100 - Limiting the rate on ARP Miss messages globally, in a VLAN, or on an interface # Configure the device to process a maximum of 200 ARP Miss messages triggered by IP packets from the Layer 2 interface GE0/0/1 in 10 seconds. [HUAWEI] interface gigabitethernet 0/0/1 [HUAWEI-GigabitEthernet0/0/1] arp-miss anti-attack rate-limit enable [HUAWEI-GigabitEthernet0/0/1] arp-miss anti-attack rate-limit packet 200 interval 10

Rate limit for DHCP packets on specified interfaces of S series switch
For S series switches in V100R006 and later versions, only the S3728 in S3700 series switches supports the interface-based rate limit for DHCP packets.

Unit of rate limits for S series switches
The unit of rate limits for S series switches (except S1700 switches) is kbit/s.

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