Default system rate limiting of inbound CPU traffic

Unnecessary traffic to the switch CPU lowers the efficiency of the CPU and delays handling of other traffic that requires processing. Default CPU rate limiting identifies the traffic type and assigns a maximum rate limit to the traffic type. The traffic types that are subjected to rate limiting include broadcast ARP and other exceptions, such as TTL exceed, IP MTU failed, reverse path check failed, IP fragments, and unsupported tunneling. Each of these types is rate limited individually.

The following table shows the rate limits for each rate-limited packet type. You cannot configure these rates.

All currently supported FastIron devices support the default CPU rate limiting feature.