Hi Qazik,
The arp rate-limit command configures the rate limit of ARP VLAN CAR for ARP packets on an interface.
By default, the rate limit of ARP VLAN CAR for ARP packets configured on an interface is 20pps.
You can refer to https://support.huawei.com/hedex/hdx.do?docid=EDOC1100168821&id=EN-US_CLIREF_0314067340&lang=en.
The alarm was generated because you had 262 and 156 respectively on your VLANs.
The device will perform as such:
If the rate of ARP packets on an interface exceeds the rate limit of CP-CAR, ARP VLAN CAR is triggered on the interface, and two-level rate limiting is performed for ARP packets to be sent to the CPU.
1. After ARP VLAN CAR is triggered on an interface, if the rate at which ARP packets are sent to the CPU does not exceed the rate limit of ARP VLAN CAR, CP-CAR is performed for all the ARP packets that are allowed to pass through. If the rate of ARP packets to be sent to the CPU exceeds the rate limit of ARP VLAN CAR, the excess packets are discarded, and CP-CAR is performed for the ARP packets that are allowed to pass through.
2. CP-CAR is then performed for ARP packets that have experienced ARP VLAN CAR. If the rate of ARP packets to be sent to the CPU does not exceed the rate limit of CP-CAR, all ARP packets are sent to the CPU. If the rate of ARP packets to be sent to the CPU exceeds the rate limit of CP-CAR, the excess ARP packets are discarded, and the ARP packets that are allowed to pass through are sent to the CPU.
I hope it helps!
