Licensing Requirements For Traffic Storm Control - Cisco Nexus 9000 Series Configuration Manual

Licensing Requirements for Traffic Storm Control

Figure 18: Broadcast Suppression
The traffic storm control threshold numbers and the time interval allow the traffic storm control algorithm to
work with different levels of granularity. A higher threshold allows more packets to pass through.
Traffic storm control on the Cisco Nexus 9000v device is implemented in the hardware. The traffic storm
control circuitry monitors packets that pass from a Layer 2 interface to the switching bus. Using the
Individual/Group bit in the packet destination address, the circuitry determines if the packet is unicast or
broadcast, tracks the current count of packets within the 3.9-millisecond interval, and filters out subsequent
packets when a threshold is reached.
Traffic storm control uses a bandwidth-based method to measure traffic. You set the percentage of total
available bandwidth that the controlled traffic can use. Because packets do not arrive at uniform intervals, the
3.9-millisecond interval can affect the behavior of traffic storm control.
The following are examples of traffic storm control behavior:
• If you enable broadcast traffic storm control, and broadcast traffic exceeds the level within the
• If you enable broadcast and multicast traffic storm control, and the combined broadcast and multicast
• If you enable broadcast and multicast traffic storm control, and broadcast traffic exceeds the level within
• If you enable broadcast and multicast traffic storm control, and multicast traffic exceeds the level within
By default, the Cisco Nexus 9000v software takes no corrective action when the traffic exceeds the configured
level. However, you can configure an Embedded Event Management (EEM) action to error-disable an interface
if the traffic does not subside (drop below the threshold) within a certain time period. For information about
configuring EEM, see the Cisco Nexus 9000 Series NX-OS System Management Configuration Guide.
Licensing Requirements for Traffic Storm Control
The following table shows the licensing requirements for this feature:
Cisco Nexus 9000 Series NX-OS Security Configuration Guide, Release 9.x
432
3.9-millisecond interval, traffic storm control drops all broadcast traffic until the end of the interval.
traffic exceeds the level within the 3.9-millisecond interval, traffic storm control drops all broadcast and
multicast traffic until the end of the interval.
the 3.9-millisecond interval, traffic storm control drops all broadcast and multicast traffic until the end
of the interval.
the 3.9-millisecond interval, traffic storm control drops all broadcast and multicast traffic until the end
of the interval.
Configuring Traffic Storm Control