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Enterasys Networks 9034385 Plumbing Product User Manual

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Inline NAC Design Procedures

Enterasys NAC Design Guide 5-31

Figure 5-9 Layer 2 NAC Controller Redundancy

ForaLayer3NACController,redundancyisachievedbyimplementingredundantLayer3

NACControllersonadjacent,butseparatenetworksasshowninFigure 5‐10.TheNAC

Controllersmustbeindifferentnetworks,andadynamicroutingprotocolsuchasOSPFor

RIPmustbeconfiguredbetweenthe

upstreamanddownstreamroutersthatarepositionedon

eithersideoftheNACControllers.RedundantLayer3NACControllersareactive‐active,in

thattrafficfromadownstreamroutermaypassthrougheitheroftheredundantLayer3NAC

Controllerswithequalcostmultipathforwardingimplementedfortheconfigureddynamic

routing

protocol.IfNACController#1(PEPorNACEngine)stopsforwardingtraffic,the

networkwillautomaticallyconvergeusingtheconfiguredroutingprotocoltoforwardtraffic

throughNACController#2.NotethattheNACControllersdonotroutepacketsanddonot

participateinthelayer3topology.

Figure 5-10 Layer 3 NAC Controller Redundancy

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