Dell PowerEdge M420 Dell PowerConnect M8024-k User's Configuration Guide - Page 694
What is Storm Control?, What are Protected Ports?
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What is Storm Control? A LAN storm is the result of an excessive number of broadcast, multicast, or unknown unicast messages simultaneously transmitted across a network by a single port. Forwarded message responses can overload network resources and cause network congestion. The storm control feature allows the switch to measure the incoming broadcast, multicast, and/or unknown unicast packet rate per port and discard packets when the rate exceeds the defined threshold. Storm control is enabled per interface, by defining the packet type and the rate at which the packets are transmitted. For each type of traffic (broadcast, multicast, or unknown unicast) you can configure a threshold level, which is expressed as a percentage of the total available bandwidth on the port. If the ingress rate of that type of packet is greater than the configured threshold level the port drops the excess traffic until the ingress rate for the packet type falls below the threshold. The actual rate of ingress traffic required to activate storm-control is based on the size of incoming packets and the hard-coded average packet size of 512 bytes - used to calculate a packet-per-second (pps) rate - as the forwardingplane requires PPS versus an absolute rate Kbps. For example, if the configured limit is 10%, this is converted to ~25000 PPS, and this PPS limit is set in the hardware. You get the approximate desired output when 512 bytes packets are used. What are Protected Ports? The switch supports up to three separate groups of protected ports. Traffic can flow between protected ports belonging to different groups, but not within the same group. A port can belong to only one protected port group. You must remove an interface from one group before adding it to another group. Port protection occurs within a single switch. Protected port configuration does not affect traffic between ports on two different switches. No traffic forwarding is possible between two protected ports. 694 Configuring Port-Based Traffic Control
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1,199
-
1,200
-
1,201
-
1,202
-
1,203
-
1,204
-
1,205
-
1,206
-
1,207
-
1,208
-
1,209
-
1,210
-
1,211
-
1,212
-
1,213
-
1,214
-
1,215
-
1,216
-
1,217
-
1,218
-
1,219
-
1,220
-
1,221
-
1,222
-
1,223
-
1,224
-
1,225
-
1,226
-
1,227
-
1,228
-
1,229
-
1,230
-
1,231
-
1,232
-
1,233
-
1,234
-
1,235
-
1,236
-
1,237
-
1,238
-
1,239
-
1,240
-
1,241
-
1,242
-
1,243
-
1,244
-
1,245
-
1,246