Finisar Surveyor manual Broadcast/Multicast Storms, Rate of change of Bcast/Mcast Packets=500

Expert Features 10

MAC Layer

Broadcast/Multicast Storms

Counter

The Broadcast/Multicast Storms counter increments when a change in the number of total Broadcast/Multicast packets per second exceeds a threshold. Broadcast/ Multicast Storms can be used to monitor extreme peaks in the number of broadcast and/or multicast messages. A count of all instances where the threshold is reached displays in the Overview counters of Expert View.

Expert Symptom

Broadcast/Multicast Storm events are automatically logged as expert symptoms. The Symptom Summary field provides information about the rate of change for broadcast and multicast packets. For example:

Rate of change of Bcast/Mcast Packets=500

The threshold value for this symptom can be changed. The default threshold is a delta of 400 broadcast/multicast events per second.

Diagnostic Details

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Problem Description:

The broadcast storm expert threshold has been exceeded for this segment, resulting in a MAC Broadcast Storm symptom.

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Probable Cause(s):

1.The network is overloaded.

2.Variations in application traffic patterns.

3.Heavy Internet usage.

4.Too many broadcast/multicast packets from the switch/bridge.

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Recommended Action(s):

1.Load balance your network.

2.If you see repeated storms, your router or switch may needed upgrading or reconfigur- ing.

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