Storm Control

Storm control limits broadcast/multicast/unknown-unicast traffic to prevent storms.

Updated: 2026-03-05

Definition

Storm control protects a switch by limiting the rate of certain traffic types that can flood the network.

It helps mitigate broadcast storms caused by loops or misbehaving devices.

Key points

Limits broadcast/multicast/unknown-unicast
Protects against storms and CPU overload
Works as a safety control, not a replacement for STP

Common mistakes

Setting thresholds too low, breaking legitimate traffic.
Relying on storm control instead of fixing loops (STP).

Related exams

Cisco CCNA (200-301)

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