Enterasys D-Series User Manual

Port Mirroring
Enterasys D-Series CLI Reference 6-33
Port Mirroring
TheD‐Seriesdeviceallowsyoutomirror(orredirect)thetrafficbeingswitchedonaportforthe 
purposesofnetworktrafficanalysisandconnectionassurance.Whenportmirroringisenabled,
oneportbecomesamonitorportforanotherportwithinthedevice.
Mirroring Features
TheD‐Seriesdevicesupportsthefollowingmirroringfeatures:
• Mirroringcanbeconfiguredinamany‐to‐oneconfigurationsothatonetarget(destination)
portcanmonitortrafficonupto8sourceports.
•Bothtransmitandreceivetrafficwillbemirrored.
•Adestinationportwillonlyactasamirroringport
whenthesessionisoperationallyactive.
•Whenaportmirroriscreated,themirrordestinationportisremovedfromtheegresslistof
VLAN1afterareboot.
•MACaddresseswillbelearnedforpacketstaggedwiththemirrorVLANID.Thiswill
preventtheabilitytosnooptrafficacrossmultiple
hops.
Purpose
Toreviewandconfigureportmirroringonthedevice.
Commands
show port mirroring
Usethiscommandtodisplaythesourceandtargetportsformirroring,andwhethermirroringis
currentlyenabledordisabledforthoseports.
Syntax
show port mirroring
Parameters
None.
Caution: Port mirroring configuration should be performed only by personnel who are
knowledgeable about the effects of port mirroring and its impact on network operation.
Caution: Traffic mirrored to a VLAN may contain control traffic. This may be interpreted by the
downstream neighbor as legal control frames. It is recommended that you disable any protocols
(such as Spanning Tree) on inter-switch connections that might be affected .
For information about... Refer to page...
show port mirroring 6-33
set port mirroring 6-34
clear port mirroring 6-35

Enterasys D-Series Specifications

General

Brand	Enterasys
Model	D-Series
Category	Switch
Language	English