Switch User Manual

Configuring Broadcast Suppression
SecureStack C3 Configuration Guide 7-33
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 10-20 for more information.
For information about... Refer to page...
show port broadcast 7-33
set port broadcast 7-34
clear port broadcast 7-34
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7‐1.