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OSPF Overview
Matrix DFE Series and N-SA User’s Guide 8-3
Link-State Advertisements (LSAs)
UsingOSPF,theMatrixDFE‐PlatinumSeriessystemfloodslink‐stateadvertisement(LSA)
packetstokeepitstopologicaldatabaseupdated,andtohelpensurethedatabasesofitsneighbors
arealsocurrent.
Typesof LSAs,eachrelatingtoaparticularpartoftheOSPFroutingdomain,areasfollows.
Routerlink
advertisementsaresentbyeachDFESeriessystemconfiguredwithOSPFtodescribe
therouter’slinkswithinthearea.Therouterfloodstheseadvertisementswithinthesinglearea
only.
Networklinkadvertisementsdescribealltheroutingsystemsthatareattachedtothenetwork.
Theadvertisementsarefloodedwithinasinglearea
only.Theyaregeneratedbythedesignated
router.
Summarylinkadvertisementsdescribethe routesinotherOSPFareasthattheDFESeriessystem
knowsabout.TheDFESeriessystemmustbeconfiguredasanareaborderrouter(ABR)to
performthistypeofflooding.Theseadvertisementsarefloodedtotheareas
thatusetheroutes.
TheareasmustbewithinthesameAS.
ASexternallinkadvertisementsdescribeexternalroutesthattheDFESeriessystemknows
about.TheDFESeriessystemmustbeconfiguredasanASboundaryrouter(ASBR)tofloodthis
typeofadvertisement.Theseadvertisementsarefloodedthroughoutthe
AS,excepttostubareas.
TheDFESeries/N‐SAsystemsupportsopaqueType7LSAsfornot‐so‐stubbyareas(NSSAs).
Matrix DFE Series and N-SA Operation in OSPF Networks
EachroutingsystemwithinanOSPFASmaintainsadatabaseofthenetworktopology.Toreduce
thesizeofthedatabase,anASistypicallydividedintosmallerroutingareas,andtherouting
systemsperformdifferentroleswithintheAS.YoucanconfiguretheMatrixDFE‐PlatinumSeries
systemtoperform
anyofthethreeroutingroleswithinanOSPFautonomoussystem:internal
router,areaborderrouter(ABR),orASboundaryrouter(ASBR).
Figure 8‐1showsasampleOSPFtopology,withthedifferenttypesofrouters.
Internalrouter–Systemswithinaspecificareaarecalledinternalrouters.WhentheTN250G
functions
asaninternalrouter,allinterfacesaredirectlyconnectedtootherrouterswithinthe
samearea.
Areaborderrouter–AsanABR,theDFESeriessystemcanbelongtomultipleareas.Inthisrole,
theroutermaintainsaseparatetopologydatabaseforeachareainwhichitisamember.
TheDFE
Seriessystem’sABRsupportincludesroutesummarization,whichenablestheroutertoadvertise
aroutethatconsolidatesmultipleadvertisedaddresses.TheDFESeriessystemalsosupports
virtuallinks,enablingconnectiontoabackbonewithoutaphysicalconnection.Stubareasupport
includestheabilitytopreventABRsfromsendingsummary
link‐stateadvertisementsintothe
stubarea.
IftheDFESeriessystemhasmorethanoneareaconfigured,andatleastoneisthebackbone,the
routerautomaticallyisanABR.
ASboundaryrouter–TheDFESeriessystemcanalsobeconfiguredasanASBR.Inthisrole,the
router
exchangesexternallylearnedroutinginformationwithotherroutersthroughouttheAS.As
anASBR,therouterprovidesrouteredistribution,aswellasrouteaggregationtohelpreducethe
amountofroutinginformationinthenetwork.Theimportingandexportingofroutingpoliciesis
alsoafunctionofASBRs.ASBRsarecreated
whenyouconfigurerouteredistribution.
- Matrix DFE Series and N-SA 1
- User’s Guide 1
- Enterasys Networks, Inc 4
- Firmware License Agreement 4
- Contents 7
- Chapter 6: Managing Syslog 9
- Chapter 7: Configuring IP 9
- Chapter 8: Configuring OSPF 10
- Chapter 9: Configuring VRRP 10
- Procedures 12
- Features Overview 13
- Factory Default Settings 14
- 1-2 Features Overview 14
- 1-4 Features Overview 16
- No value applied 17
- Device Management Methods 18
- Getting Started 19
- 2-2 Getting Started 20
- Using a Telnet Connection 21
- Setting System Passwords 22
- Setting Syslog Parameters 23
- 2-6 Getting Started 24
- ]: download 28
- ]: setboot myimage 29
- Resetting the Device 30
- Activating Licensed Features 31
- Using WebView 32
- Using the CLI 33
- Creating Strong Passwords 34
- Setting New System Passwords 36
- Setting Password Policies 38
- Enabling or Disabling Telnet 39
- About Host Keys 40
- Setting CLI Parameters 41
- Displaying Scrolling Screens 42
- Using Context-Sensitive Help 42
- Performing Keyword Lookups 43
- Abbreviating a Command 44
- Console Ports 45
- Switch Ports 46
- Designating Ports in the CLI 46
- 3-16 Using the CLI 48
- 3-18 Using the CLI 50
- 3-20 Using the CLI 52
- Configuring Link Aggregation 53
- LACP Operation 54
- LACP Terminology 54
- Reviewing the Configuration 56
- Configuring Spanning Trees 61
- N‐SAdevice. 62
- Term Definition 62
- Spanning Tree (IEEE 802.1D) 63
- MST Region 64
- Physical Link 66
- Blocked VLANs 66
- Spanning Tree Port States 67
- Configuring STP and RSTP 68
- Setting the Bridge Priority 69
- Setting a Port Priority 70
- Assigning Port Costs 70
- Adjusting Port Hello Times 71
- Adjusting RSTP Parameters 72
- Defining Point-to-Point Links 73
- Defining Edge Port Status 73
- Configuring MSTP 74
- Adjusting MSTP Parameters 75
- Monitoring MSTP 75
- Configuring Spanguard 76
- Managing Syslog 79
- Interpreting Messages 80
- Enabling Syslog Server(s) 82
- Modifying default settings 83
- 6-6 Managing Syslog 84
- Displaying a log file 85
- 6-8 Managing Syslog 86
- Configuring IP 87
- Example Scenario 88
- 7-4 Configuring IP 90
- 7-6 Configuring IP 92
- Assigning an IP Address 93
- Sample Configuration 94
- 7-10 Configuring IP 96
- Displaying the ARP Table 98
- Changing the ARP Timeout 100
- Clearing the ARP Cache 100
- Enabling DHCP/BOOTP Relay 102
- Examples 103
- Configuring ICMP 104
- Using Traceroute 105
- 7-20 Configuring IP 106
- Configuring OSPF 107
- OSPF Terminology 108
- Supported Functions 108
- OSPF Overview 109
- OSPF Areas 110
- Static Multipath Forwarding 111
- Designating an OSPF Instance 111
- Virtual Links 111
- 8-6 Configuring OSPF 112
- 8-8 Configuring OSPF 114
- Activating Advanced Routing 115
- 8-10 Configuring OSPF 116
- Configuring an OSPF NSSA 117
- 8-12 Configuring OSPF 118
- Displaying OSPF Information 119
- Limiting Database Overflow 119
- Resetting OSPF 120
- Debugging OSPF 120
- Configuring VRRP 121
- Basic VRRP Configuration 123
- Router R2 Configuration 124
- Symmetrical Configuration 125
- Router R1 Configuration 126
- Multi-Backup Configuration 128
- 10.0.0.1/16 129
- 10.0.0.2/16 129
- 10.0.0.3/16 129
- 9-10 Configuring VRRP 130
- Router R3 Configuration 132
- Modifying a Configuration 134
- Setting a Critical IP Address 135
- Setting Pre-empt Mode 135
- Setting an Authentication Key 136
- Monitoring VRRP 137
- VRRP Configuration Notes 137
- 9-18 Configuring VRRP 138
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