Enterasys b5 User Manual

Port Mirroring
7-38 Port Configuration
Port Mirroring
TheEnterasysB5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(thestack,if
applicable).
Mirroring Features
TheEnterasysB5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.Onlyonemirrordestinationportcanbe
configuredperstack,ifapplicable.
•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.
Remote Port Mirroring
Remoteportmirroringisanextensiontoportmirroringwhichfacilitatessimultaneousmirroring
ofmultiplesourceportsonmultipleswitchesacrossanetworktooneormoreremotedestination
ports.
Remoteportmirroringinvolvesconfigurationofthefollowingportmirroringrelatedparameters:
1. Configurationofnormalportmirroringsourceportsandone
destinationportonallswitches,
asdescribedabove.
2. ConfigurationofamirrorVLAN,whichisauniqueVLANonwhichmirroredpackets
traverseacrossthenetwork.ThemirrorVLANhastobeconfiguredonALLswitchesacross
thenetworkalongwhichmirroredtraffictraverses,fromtheswitchwherethesourceports

residetotheswitchwherethemirroredpacketsaresniffedand/orcaptured.
Youmustensurethatswitchesinvolvedareproperlyconfiguredtofacilitatecorrectremoteport
mirroringoperation.Thefollowingpointsinparticularneedtobeobserved:
•Onthesourceswitch,thecorrectdestinationportmustbechosentoensurethat
thereisan
egresspathfromthatporttothedesiredremotedestination(s).
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.
Note: An Enterasys Networks Feature Guide document containing an in-depth discussion of port
mirroring configuration is located on the Enterasys Networks web site:
https://extranet.enterasys.com/downloads//
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 .

Enterasys b5 Specifications

General

Brand	Enterasys
Model	b5
Category	Other
Language	English