Configuring Flood Rate Limiting - Alcatel-Lucent OmniSwitch 9900 Series Network Configuration Manual

Configuring Ethernet Ports

Configuring Flood Rate Limiting

The OmniSwitch implementation of storm control supports flood rate limiting for broadcast, unknown
unicast, and multicast traffic. A high threshold rate is configured in megabits-per-second (mbps), packets-
per-second (pps), or as a percentage of the port speed. When the threshold value is reached, packets are
dropped.
To configure the flood rate limit threshold, use the
-> interfaces 2/1/1 flood-limit bcast rate mbps 100
-> interfaces 2/1/2-5 flood-limit uucast rate pps 500
-> interfaces slot 3/1 flood-limit mcast rate cap% 50
Configuring a Flood Rate Limit Action
Configuring a port shutdown or trap action to occur when the rate limit threshold is reached provides a
method for monitoring storm traffic.
•
Port shutdown action—port is moved to a STORM violated state and a violation trap is sent.
•
Trap action—the storm is controlled through flood rate limiting and a trap is sent. The port is not
moved into a STORM violated state.
To configure the flood rate limit action, use the interfaces flood-limit action command with either the
shutdown or trap option. For example:
-> interfaces 1/1/1 flood-limit bcast action shutdown
-> interfaces 1/1/4 flood-limit uucast action trap
Use the all option with the interfaces flood-limit action command to specify all types of traffic. For
example:
-> interfaces 1/1/11 flood-limit all action shutdown
To set the flood rate limit action back to the default value (no action is taken) use the interfaces flood-
limit action command with the default option. For example:
-> interfaces 1/1/14 flood-limit mcast action default
Configuring Auto-Recovery for Port Shutdown Action
When a port is shutdown because of a STORM violated state, an administrator will have to clear the
violation. However, configuring a low threshold value for flood rate limiting can help to automate this
process. When the rate of violating traffic received on the port goes below the low threshold value, the
port is removed from the violating state.
To configure the low threshold value, use the
option. For example:
-> interfaces 1/1/1 flood-limit bcast rate mbps 60 low-threshold 40
-> interfaces 1/1/4 flood-limit uucast rate mbps 100 low-threshold 40
-> interfaces 1/1/5 flood-limit mcast rate pps 2000 low-threshold 1000
Configuring Flood Rate Limiting
The following section describes how to apply a flood limit value to broadcast, unicast flooded, or
multicast traffic for a slot, port, or a range of ports. The
set limits based on pps, mbps, or a percentage of the port bandwidth.
OmniSwitch AOS Release 8 Network Configuration Guide
interfaces flood-limit
interfaces flood-limit command with the low-threshold
interfaces flood-limit
December 2017
Configuring Ethernet Port Parameters
command For example:
command can be used to
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