Configuring Broadcast Suppression
11-34 Port Configuration
Configuring Broadcast Suppression
Purpose
To review and set the broadcast suppression threshold for one or more ports. This feature limits
the number of received broadcast frames the switch will accept per port. Broadcast suppression
thresholds apply only to broadcast traffic—multicast traffic is not affected. By default, a broadcast
suppression threshold of 14881 packets per second (pps) will be used, regardless of actual port
speed. Broadcast suppression protects against broadcast storms and ARP sweeps.
Commands
show port broadcast
Use this command to display port broadcast suppression thresholds.
Syntax
show port broadcast [port-string]
Parameters
Defaults
If port-string is not specified, broadcast status of all ports will be displayed.
Mode
Switch command, read-only.
Example
This example shows how to display the broadcast suppression thresholds for ports 1 through 4:
C3(su)->show port broadcast ge.1.1-4
Port Total BC Threshold
Packets (pkts/s)
----------------------------------------
ge.1.1 0 50
Note: Class of Service functionality can also be used to control broadcast, unknown unicast, and/or
multicast flooding. This feature prevents configured ports from being disrupted by a traffic storm by
rate-limiting specific types of packets through those ports. Refer to “About CoS-Based Flood
Control” on page 15-20 for more information.
For information about... Refer to page...
show port broadcast 11-34
set port broadcast 11-35
clear port broadcast 11-35
port-string (Optional) Select the ports for which to show broadcast suppression
thresholds. For a detailed description of possible port-string values, refer
to “Port String Syntax Used in the CLI” on page 11-1.
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