Transition Networks
S4224 Web User Guide
33558 Rev. C
Page 344 of 669
Storm
Policing
The S4224 Port Storm
Policer
is configured from the
Configuration
>
QoS
>
Storm
Policing
menu path
at the
Port
Storm Policer Configuration page.
There is a storm policer for unicast frames, broadcast frames and unknown (flooded) frames.
A traffic storm occurs when packets flood a LAN, creating excessive traffic which degrades network
performance. The Storm Control feature prevents ports from being disrupted by a broadcast, multicast, or
unicast traffic storm on a physical interface. Storm Control monitors incoming traffic levels over a selected
traffic storm control rate and, during the interval, compares the traffic level with the selected traffic storm
control level. Each port has traffic storm control levels that are used for each traffic type (Unicast,
Multicast, and Broadcast). When the ingress traffic for which Storm Control is enabled reaches the traffic
storm control rate you configured on the port, Storm Control drops traffic until the Storm Control interval
ends. A higher rate allows more packets to pass through without dropping traffic.
Note
: Frames sent to the S4224 CPU are limited to approximately 4 kpps (e.g., Management VLAN
broadcasts are limited to this rate). The Management VLAN is configured at
Configuration
>
System
>
IP
.
Port
The port number for which the configuration below applies.
Enable
Enable or disable the storm policer for this switch port.
Rate
Controls the rate for the
port
storm policer. This value is restricted to 1-13128072 when "Unit" is fps or
kbps, and 1-13128 when "Unit" is kfps or Mbps. The rate is internally rounded up to the nearest value
supported by the port storm policer.
Unit
Controls the unit of measure for the port storm policer rate as fps, kfps, kbps or Mbps.