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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 35 Configuring Broadcast Suppression
Configuring Broadcast Suppression on the Switch
This example shows how to limit the multicast and broadcast traffic to 80 percent for port 1 on
module 2 and verify the configuration:
Console> (enable) set port broadcast 2/1 80% multicast enable
Port 2/1 broadcast and multicast traffic limited to 80.00%.
On broadcast suppression port 2/1 is configured to drop-packets.
Console> (enable) show port broadcast 2/1
Port Broadcast-Limit Multicast Unicast Total-Drop Action
-------- --------------- --------- ------- -------------------- ------------
2/1 80.00 % 80.00 % - 0 drop-packets
Console> (enable)
Disabling Broadcast Suppression
To disable broadcast suppression on one or more ports, perform this task in privileged mode:
This example shows how to disable broadcast suppression on one or more ports:
Console> (enable) clear port broadcast 2/1
Port 2/1 traffic unlimited.
Console> (enable)
Enabling the errdisable State
Note A port is in the errdisable state if it is enabled in NVRAM but is disabled at runtime by any process. For
example, if UniDirectional Link Detection (UDLD) detects a unidirectional link, the port shuts down at
runtime. However, because the NVRAM configuration for the port is enabled (you have not disabled the
port), the port status is shown as errdisable.
When broadcast, multicast, or unicast suppression occurs, you can configure the ports to either drop the
packets or go into the errdisable state. The errdisable state feature can be enabled or disabled on a
per-port basis and is disabled by default (the drop-packets option is enabled by default).
Note When broadcast, multicast, or unicast suppression occurs and a port is configured for errdisable, there
is a delay before the port stops dropping the packets and goes to the errdisable state. The delay period
varies; the exact amount of delay can vary from switch to switch.
Task Command
Disable broadcast suppression on one or more
ports.
clear port broadcast mod/port
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