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Chapter 5: Switching Commands
433
Storm-Control Commands
This section describes commands you use to configure storm-control and view
storm-control configuration information. A traffic storm is a condition that
occurs when incoming packets flood the LAN, which creates performance
degradation in the network. The Storm-Control feature protects against this
condition.
FASTPATH provides broadcast, multicast, and unicast story recovery for
individual interfaces. Unicast Storm-Control protects against traffic whose MAC
addresses are not known by the system. For broadcast, multicast, and unicast
storm-control, if the rate of traffic ingressing on an interface increases beyond the
configured threshold for that type, the traffic is dropped.
To configure storm-control, you will enable the feature for all interfaces or for
individual interfaces, and you will set the threshold (storm-control level) beyond
which the broadcast, multicast, or unicast traffic will be dropped. The Storm-
Control feature allows you to limit the rate of specific types of packets through
the switch on a per-port, per-type, basis.
Configuring a storm-control level also enables that form of storm-control.
Disabling a storm-control level (using the “no” version of the command) sets the
storm-control level back to the default value and disables that form of storm-
control. Using the “no” version of the “storm-control” command (not stating a
“level”) disables that form of storm-control but maintains the configured “level”
(to be active the next time that form of storm-control is enabled.)
Note
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 forwarding-plane
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 forwarding plane
(hardware). You get the approximate desired output when 512bytes packets are
used.
storm-control
broadcast
Use this command to enable broadcast storm recovery mode for all interfaces
(Global Config mode) or one or more interfaces (Interface Config mode). If the
mode is enabled, broadcast storm recovery is active and, if the rate of L2
Summary of Contents for CN1610
Page 3: ......
Page 31: ...28 Accessing the CLI ...
Page 309: ...306 Remote Monitoring Commands ...
Page 473: ...470 Port Mirroring Commands 100 ...
Page 487: ...484 DHCP L2 Relay Agent Commands Mode Privileged EXEC ...
Page 607: ...604 IPv6 Management Commands ...