Storm Control Multicast

Storm Control

When Broadcast, unknown Multicast or unknown Unicast frames are received, they are duplicated, and a copy is sent to all possible egress ports. This means that in practice they are sent to all ports belonging to the relevant VLAN. In this way, one ingress frame is turned into many, creating the potential for a storm.

Storm protection enables you to limit the number of frames entering the switch and to define the types of frames that are counted towards this limit

  1. Click Security > Storm Control.
  2. Configure the following parameters:
  3. Frame Configuration—Select Included (including preamble and IFG 20Bytes)to count the Broadcast, unknown Multicast, or unknown Unicast frames, or select Excluded (excluding preamble and IFG 20Bytes) to not count the Broadcast, unknown Multicast, or unknown Unicast frames.
  4. Storm Control Rate Threshold Mode—Select the mode of the rate threshold: Packets per second or Kbits/sec.
  5. Click Apply. The storm control parameters are defined, and the Running Configuration is updated.
  6. To modify the storm control settings for a port, select the desired port and click Edit.
  7. Enter the following information:
  8. Interface—Select the port to be defined.
  9. Storm Control—Enable or disable storm control on the port.
  10. Unknown Unicast—Enable or disable storm control for unknown Unicast traffic. It will count unknown Unicast traffic towards the bandwidth threshold.
  11. Storm Control Rate Threshold—Enter the maximum rate at which unknown Unicast packets can be forwarded. The default for this threshold is 10,000.
  12. Unknown Multicast—Enable or disable storm control for unknown Multicast traffic. It will count unknown Multicast traffic towards the bandwidth threshold.
  13. Storm Control Rate Threshold—Enter the maximum rate at which unknown Multicast packets can be forwarded. The default for this threshold is 10,000.
  14. Broadcast—Enable or disable storm control for Broadcast traffic. It will count Broadcast traffic towards the bandwidth threshold.
  15. Storm Control Rate Threshold—Enter the maximum rate at which Broadcast packets can be forwarded. The default for this threshold is 10,000.
  16. Action—Select the action when the rate of Broadcast, unknown Multicast, or unknown Unicast frames is higher than the user-defined threshold. The options are:
  17. Drop—Discard the frames received beyond the threshold.
  18. Shutdown—Shut down the port.
  19. Click Apply. The port’s storm control settings are modified, and the Running Configuration is updated.

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