Dell Networking 2024 Reference Manual page 1105

rate-limit cpu
Use the rate-limit cpu command to reduce the amount of unknown
unicast/multicast packets forwarded to the CPU on CoS queues 0 and 1.
This command also configures the rate in packets-per-second for the number
of IPv4 and IPv6 data packets trapped to CPU when the packet fails to be
forwarded in the hardware due to unresolved MAC address of the destination
IPv6 node. Packets exceeeding the rate limit are silently discarded.
Use the no form of the command to return the rate limit to the default value.
Syntax
rate-limit cpu direction input pps
no rate-limit cpu direction input pps
• pps-value—Range of 100-1024 packets per second (100-3000 for N4000
switches)
Default Configuration
The default is 1024 packets per second (3000 for N4000 switches)
Command Modes
Global Configuration mode
User Guidelines
Unknown multicast and IPv4/IPv6 data packets destined to hosts in the
connected networks on the router for which the MAC address is not resolved
are trapped to CPU to trigger the ARP/neighbor discovery resolution of those
hosts.
When the ARP or neighbor table is filled, the switch cannot accommodate
new entries. In this case, there is no value in receiving the unresolved
IPv4/IPv6 packets. Likewise, in cases of a L2 network re-convergence, a large
number of neighbors may not be discovered but may be transmitting traffic.
In the case of multicast data, certain multicast topologies using multiaccess
VLANs may result in packets being forwarded to the CPU with no associated
PIM or MFDB state.
pps-value
IPv6 Routing Commands
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