Port Mirroring
D-Series CLI Reference 4-31
Port Mirroring
TheD‐Seriesdeviceallowsyoutomirror(orredirect)thetrafficbeingswitchedonaportforthe
purposesofnetworktrafficanalysisandconnectionassurance.Whenportmirroringisenabled,
oneportbecomesamonitorportforanotherportwithinthedevice.
Mirroring Features
TheD‐Seriesdevicesupportsthefollowingmirroringfeatures:
• Mirroringcanbeconfiguredinamany‐to‐oneconfigurationsothatonetarget(destination)
portcanmonitortrafficonupto8sourceports.
•Bothtransmitandreceivetrafficwillbemirrored.
•Adestinationportwillonlyactasamirroringport
whenthesessionisoperationallyactive.
•Whenaportmirroriscreated,themirrordestinationportisremovedfromtheegresslistof
VLAN1afterareboot.
•MACaddresseswillbelearnedforpacketstaggedwiththemirrorVLANID.Thiswill
preventtheabilitytosnooptrafficacrossmultiple
hops.
Purpose
Toreviewandconfigureportmirroringonthedevice.
Commands
show port mirroring
Usethiscommandtodisplaythesourceandtargetportsformirroring,andwhethermirroringis
currentlyenabledordisabledforthoseports.
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 4-31
set port mirroring 4-32
clear port mirroring 4-33
To Next Page
Loading...
Need help?
General
