ARP learning rate limiting on S series switch

Publication Date:  2016-11-21 Views:  93 Downloads:  0
Issue Description
ARP learning rate limiting on S series switch.
Solution
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.

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