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This section describes how to configure the PoE's Storm Control and Port Mirroring configuration parameter values from the Configure PoE window.

Storm Control Configuration

A traffic storm occurs when packets flood the LAN, creating excessive traffic and degrading network performance. The Storm Control feature limits the rate of flooding and of traffic forwarding. Listed below are the various parameters in Storm Control: 

  • Learn Frames Rate: Choose the MAC address learn frame rate. Switches learn MAC addresses only from the source MAC address of incoming frames. You can choose from a range of 1K to 512K or No Limit.
  • Broadcast Rate: Choose the broadcast forwarding frame rate. Broadcast packets are duplicated and copies sent on multiple links to devices within a broadcast domain. You can choose from a range of 1K to 512K or No Limit. 
  • Multicast Rate: Choose the multicast flooding frame rate. Multicast traffic is flooded to a switch port because a MAC address has timed out or has not been learned by the switch. You can choose from a range of 1K to 512K or No Limit. 
  • Flooded Unicast Rate: Choose the unicast flooding frame rate. Unicast traffic is flooded to a switch port because a MAC address has timed out or has not been learned by the switch. You can choose from a range of 1K to 512K or No Limit. 
  • Monitor Port Type: This can be either System, Port or OFF. 

The configurable frame rates are exponential and range from 0 to 32 megaframes per second. The possible configurations are therefore 1, 2, 4, 8, 16  kiloframes per second and so on. 

Note

The Storm Controller is centralized, so the configured rate specifies the maximum total number of frames per second for the entire switch (and not per port). Also, Multicast Storm Control applies to unregistered and unknown multicast MAC addresses.

Port Mirroring

Mirroring is used to monitor LAN traffic by mirroring receive and transmit traffic from selected LAN ports on to a monitor port. 

Listed below are the parameters in Port Mirroring: 

  • Monitor Port: Select which LAN port should be the Monitor port. All traffic from the Source port is mirrored on this port. 
    On some platforms, System port is available. This is the LAN port the system is connected to. To monitor traffic from the system, select this port. 
  • Source Port: Select the LAN ports that you want to be mirrored on to the Monitor port. All traffic from these ports is mirrored on the Monitor port.

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