Specifications

How Do I Implement Port Mirroring?
May 04, 2011 Page 3 of 15
Figure 2 Using Port Mirroring to Monitor All Incoming Traffic to a Backbone Switch
Themany‐to‐oneconfigurationinthisexamplewouldbepossiblebysettingaportmirroronthe
backbonebetweensourceports1.2,2.2and2.1todestinationport1.1.
How Do I Implement Port Mirroring?
YoucanimplementportmirroringonEnterasysswitchingdevicesusingsimpleCLIcommands.
Oncethespecificdeviceportsareoperationallylinked,youusethesetportmirrorcommandto
createamirroringrelationshipbetweenyourintendedsourceandyourtargetport(s).Youcanalso
useCLItooperationallydisablemirroring,if
necessary,andtospecifywhethertomirrorreceived
traffic,transmittedtraffic,orboth.Someswitchingdevicesalsoprovidetheoptionofmonitoring
multicasttrafficbyallowingyoutoenableIGMPmirroringonspecificports.
Refertothefollowingsectiontodeterminetheporttypesandcapacitiesforportmirroring
supportedon
yourEnterasysdevice.
Functions and Features Supported on Enterasys Switches
AllEnterasysswitchessupportmany‐to‐oneportmirroring.Somealsosupportone‐to‐manyand
many‐to‐manyconfigurations.Specificcapabilities,suchashowmanydestinationportscanbe
activeatanyonetime,varybydevice.Table 1listsportmirroringsupportandcapacityforeach
switchingdevice.
Note: It is important to not oversubscribe ports in a mirroring configuration. This can cause
bottlenecks and will result in discarded traffic.
Table 1 Port Mirroring Support on Enterasys Switches
Switch IDS VLAN LAG Max. Mirrors
Many-to-
One
One-to-
Many
Many-to-
Many
S-Series yes yes yes 15 per chassis yes yes yes
K-Series yes yes yes 4 per chassis yes yes yes