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Out-of-Band NAC Design Procedures
Enterasys NAC Design Guide 5-21
Figure 5-5 NAC Gateway Redundancy
ItisimportantthatthesecondaryNACGatewaydoesnotexceedmaximumcapacityifthe
primaryNACGatewayfailsonthenetwork.Forexample,let’ssaythattwoNACGateways,
bothrunningatmaximumloadonthenetwork,arebeingusedbysixswitches.NACGateway
#1istheprimary
gatewayforswitchA,switchB,andswitchC,andNACGateway#2isthe
primarygatewayforswitchD,switchE,andswitchF.Inthisscenario,NACGateway#1
shouldnotbeconfiguredtoserveassecondaryforNACGateway#2andviceversa.Thisis
becauseifNAC
Gateway#1fails,NACGateway#2,whichisalreadyrunningatmaximum
capacitybeforeNACGateway#1ʹsfailure,willnotbeabletohandletheend‐systemsfailing
overfromNACGateway#1.Toavoidexceedingtheselimits,extraNACGatewayappliances
mustbedeployedonthenetworkto
serveassecondaryNACGatewaysforthesesixswitches.
Tosummarize,NACGatewayredundancymaybeaccomplishedusingtwodifferentapproaches:
•Active‐standbyredundancy
Inthisredundancyapproach,asetofswitchesareconfiguredtousethesameprimaryNAC
Gateway(assumingtheseswitchesobservetheNACGatewayʹscapacitylimitations
previously
described)andusethesamesecondaryNACGatewayasabackup(assumingthe
secondaryNACGatewayisthesamemodelastheprimary).ThesecondaryNACGatewayis
notconfiguredasaprimaryNACGatewayforanyswitchonthenetworkandthereforeis
inactiveuntilaprimaryNACGateway
fails.Forexample,ifswitchA,switchB,andswitchC
useNACGateway#1asaprimarygateway,thenallthreeswitchescanbeconfiguredtouse
NACGateway#2onthenetworkasthebackup.Inthisconfiguration,ifswitchA,switchB,or
switchClosesconnectivityto
NACGateway#1,theswitchwouldseamlesslytransitionto
usingNACGateway#2.Intheworst‐casescenariowhereallthreeswitchesloseconnectivity
toNACGateway#1,NACGateway#2wouldbeabletohandleallauthenticationrequests
fromthesethreeswitches.Inthisredundancyconfiguration,NACGateway#2
iscompletely
idleonthenetworkandonlyutilizedifoneoftheswitchescannotcommunicatetoNAC
Gateway#1.
•Active‐activeredundancy
Inthisredundancyapproach,theprim aryNACGatewayforoneswitchisasecondaryNAC
Gatewayforanotherswitch.Forthisconfiguration,thesameprimaryNACGatewayis
utilized
foragroupofswitches,withthisNACGatewayrunningatonlyhalfthemaximum
load.AnothergroupofswitchesutilizesadifferentprimaryNACGateway(assumingitisthe
samemodel)alsorunninghalfthemaximumload.Then,eachgroupofswitchescanusethe
otherNACGatewayas
thesecondarygateway.Thisredundancyconfigurationguarantees
thatintheworst‐casescenario,whenallswitchesinonegrouplosecommunicationtotheir
- Enterasys 1
- Contents 5
- Chapter 3: Use Scenarios 6
- Chapter 4: Design Planning 6
- Chapter 5: Design Procedures 6
- About This Guide 9
- Getting Help 10
- Overview 11
- Deployment Models 12
- NAC Solution Overview 13
- NAC Solution Components 14
- NAC Gateway Appliance 15
- NAC Controller Appliance 15
- 1-6 Overview 16
- Appliance Comparison 17
- 1-8 Overview 18
- NetSight Management 19
- RADIUS Server 20
- Assessment Server 20
- 1-12 Overview 22
- NAC Deployment Models 23
- Features and Value 24
- Implementation 26
- User-Based Authorization 28
- MAC Registration 28
- Inline NAC 31
- Remediation 34
- 2-16 NAC Deployment Models 38
- Use Scenarios 39
- Policy-Enabled Edge 40
- RFC 3580 Capable Edge 41
- Scenario 1 Implementation 42
- Thin Wireless Edge 43
- 3-6 Use Scenarios 44
- Thick Wireless Edge 45
- Scenario 2 Implementation 46
- 3-10 Use Scenarios 48
- Scenario 4: VPN Remote Access 49
- Scenario 4 Implementation 50
- 3-14 Use Scenarios 52
- Design Planning 53
- Survey the Network 54
- 4-4 Design Planning 56
- End-System Capabilities 58
- Authentication Considerations 59
- 4-8 Design Planning 60
- Wired LAN 61
- Wireless LAN 61
- Remote Access WAN 62
- Site-to-Site VPN 62
- Remote Access VPN 63
- 4-12 Design Planning 64
- Design Procedures 65
- 5-2 Design Procedures 66
- NAC Configurations 67
- Authentication 68
- Assessment 68
- Authorization 69
- 5-6 Design Procedures 70
- 5-8 Design Procedures 72
- 5-10 Design Procedures 74
- MAC Overrides 76
- 5-14 Design Procedures 78
- User Overrides 80
- Assessment Design Procedures 81
- 5-18 Design Procedures 82
- 5-20 Design Procedures 84
- 5-22 Design Procedures 86
- 6. VLAN Configuration 88
- 7. Policy Role Configuration 88
- 8. Define NAC Access Policies 88
- Assessment Policy 90
- Quarantine Policy 91
- Inline NAC Design Procedures 92
- 7S4280-19-SYS Up to 2000 94
- 2S4082-25-SYS Up to 2000 94
- 5-32 Design Procedures 96
- Additional Considerations 97
- 5-34 Design Procedures 98
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