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BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 1 References RFC2338 OSPF Version 2 April 1998 Moy J OSPF anatomy of an Internet routing protocol Addison Wesley Publishing Company 1998.
Duncan Maidens Routing in Large Networks with OSPF andbeyond with BGP Presentation at ACADEMY CONFERENCE NetAcad CATC OSPF presentation OSPF Design Guide Document ID 7039 Search on CISCO webBSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 2.
OSPF Open Shortest Path First The OSPF routing protocol is the most important link state routing protocolon the Internet The complexity of OSPF is significant History .
1989 RFC 1131 OSPF Version 11991 RFC1247 OSPF Version 21994 RFC 1583 OSPF Version 2 revised 1997 RFC 2178 OSPF Version 2 revised 1998 RFC 2328 OSPF Version 2 current version .
BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 3BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 4 Representation of routers and networks 1 The Autonomous System s link state databasedescribes a directed graph .
The vertices of the graph consist of routers and A graph edge connects two routers when they areattached via a physical point to point network An edge connecting a router to a network indicates thatthe router has an interface on the network .
BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 5 Representation of routers and networks 1 The neighborhood of each network node in the graphdepends on the network s type point to point broadcast NBMA or Point to MultiPoint and the.
number of routers having an interface to the network BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 6 Position of OSPF among routing protocolsInterior ExteriorDistance vector Link state.
RIP v1 OSPF EGPRIP v2 IS IS BGPBSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 7BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 8 Terminology.
BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 9 OSPF TerminologyInterfacesBSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 10 OSPF Terminology.
InterfacesBSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 11 OSPF TerminologyInterfacesCost 1785 Cost 6.
BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 12 OSPF TerminologyInterfacesArea 1 Cost 10Cost 1785 Cost 6.
BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 13 OSPF TerminologyAutonomous SystemInterfacesArea 1 Cost 10.
Cost 1785 Cost 6BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 14 OSPF TerminologyAutonomous SystemInterfaces.
Area 1 Cost 10Cost 1785 Cost 6NeighborshipLists NeighborsBSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 15.
OSPF TerminologyAutonomous SystemInterfacesArea 1 Cost 10Cost 1785 Cost 6.
Neighborship TopologyDatabase DatabaseLists Neighbors Lists All RoutesBSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 16 OSPF Terminology.
Autonomous SystemInterfacesArea 1 Cost 10Cost 1785 Cost 6Neighborship Topology Routing.
Database Database TableLists Neighbors Lists All Routes Lists Best RoutesBSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 17 Maintaining Routing InformationLink State Change.
Router A notifies all OSPF DRs on 224 0 0 6BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 18 Maintaining Routing InformationLink State Change Router A notifies all OSPF DRs on 224 0 0 6.
DR notifies others on 224 0 0 5BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 19 Maintaining Routing InformationLink State Change Router A notifies all OSPF DRs on 224 0 0 6.
DR notifies others on 224 0 0 5BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 20 Maintaining Routing InformationLink State Change4 I need to update.
my routing table Router A notifies all OSPF DRs on 224 0 0 6 DR notifies others on 224 0 0 5BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 21 Maintaining Routing Information cont .
Is entry inLSA link stateAdd to databaseSend LSAckRun SPF to calculate.
new routing tableBSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 22 Maintaining Routing Information cont Is entry in Is seq LSA link state Ignore LSA.
database the same Add to databaseSend LSAckRun SPF to calculatenew routing table.
BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 23 Maintaining Routing Information cont Is entry in Is seq LSA link state Ignore LSAdatabase the same .
Add to databaseSend LSAckFlood LSA Send LSUwith newerRun SPF to calculate information to.
new routing table sourceBSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 24 Maintaining Routing Information cont Is entry in Is seq LSA link state Ignore LSA.
database the same A Add to database Gohigher YesSend LSAck AFlood LSA Send LSU.
with newerRun SPF to calculate information tonew routing table sourceBSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 25 BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 26.
BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 27 Purpose of this Lesson Coverage of topics new to the OSPF module of BSCI What s new in this module Some new terminology and acronyms.
More detailed explanation of LSAs and the Link state DatabaseSeveral new OSPF configuration and verification commandsOSPF authentication configuration and verification commandsBSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 28 New Terminology.
BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 29 OSPF AreasReview of OSPF area characteristics Minimizes routingtable entries.
Localizes impact ofa topology changewithin an area Detailed LSAflooding stops at.
the area boundary Requires ahierarchicalnetwork designBSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 30.
OSPF AreasNew terminology for areas Transit AreaAlso known asBackbone Area 0.
Regular AreaAlso known asNonbackboneBSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 31 OSPF Database.
OSPF maintains three databases Adjacency Database show ip ospf neighbor Link state Database show ip ospf database Forwarding Database show ip route BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 32.
What is LSDB LSDB is an acronym for Link state Database BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 33 LSAs and the Link state Database.
BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 34 LSA Sequence Numbering Each LSA in the LSDB maintains a sequence number The sequence numbering scheme is a 4 byte number thatbegins with 0x80000001 and ends with 0x7FFFFFFF .
OSPF floods each LSA every 30 minutes to maintain properdatabase synchronization Each time the LSA is flooded thesequence number is incremented by one Ultimately an LSA sequence number will wrap around to0x80000001 When this occurs the existing LSA is.
prematurely aged to maxage one hour and flushed When a router encounters two instances of an LSA it mustdetermine which is more recent The LSA having the newer higher LS sequence number is more recent BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 35.
The OSPF Link State Database The show ip ospf database command displaysthe current LSDB for the local router The next slide discusses the purpose of the Age andSeq fields highlighted below .
RTC show ip ospf databaseOSPF Router with ID 192 168 1 253 Process ID 3 Router Link States Area 0 Link ID ADV Router Age Seq Checksum Link count192 168 1 249 192 168 1 249 1705 0x80000005 0x00D5B0 5.
192 168 1 253 192 168 1 253 1578 0x80000006 0x009F91 5BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 36 Link State Data Structures LSABSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 37 Verifying LSA Age and Sequence.
In the first output below notice the age timer will expiresometime after 1800 seconds or 30 minutes RTC show ip ospf databaseOSPF Router with ID 192 168 1 253 Process ID 3 Router Link States Area 0 .
Link ID ADV Router Age Seq Checksum Link count192 168 1 249 192 168 1 249 1705 0x80000005 0x00D5B0 5192 168 1 253 192 168 1 253 1578 0x80000006 0x009F91 5 A few minutes later the router has received an LSU for both links Note the refreshed age timer and incremented sequence number .
RTC show ip ospf databaseOSPF Router with ID 192 168 1 253 Process ID 3 Router Link States Area 0 Link ID ADV Router Age Seq Checksum Link count192 168 1 249 192 168 1 249 106 0x80000006 0x00D3B1 5.
192 168 1 253 192 168 1 253 58 0x80000007 0x009D92 5BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 38 Basic OSPFConfigurationBSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 39.
Configuring OSPF An excellent resource for information on the manydifferent OSPF configurations is the Cisco white paper Configuring OSPF which can be downloaded fromthe Cisco website .
http www cisco com en US produ... ucts configuration guide chapt... BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 40 Configuring Basic OSPFRouter config .
router ospf process id vrf vpn name Enable one or more OSPF routing processes Router config router network ip address wildcard mask area area id Define the interfaces that OSPF will run on .
Router config if ip ospf process id area area id secondaries none Optional method to enable OSPF explicitly on aninterface BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 41.
Configuring OSPF for Multiple AreasBSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 42 OSPF Router ID The router is known to OSPF by the OSPF router ID number LSDBs use the OSPF router ID to differentiate one router from the.
By default the router ID is the highest IP address on an activeinterface at the moment of OSPF process startup If no interface is up when the OSPF process starts you will get the following error message p5r2 config router ospf 12w1d OSPF 4 NORTRID OSPF process 1 cannot start .
A loopback interface can override the OSPF router ID If aloopback interface exists the router ID is the highest IP addresson any active loopback interface The OSPF router id command can be used to override theOSPF router ID .
Using a loopback interface or a router id command isrecommended for stability BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 43 OSPF router id CommandRouter config router .
router id ip address This command is configured under the router ospf process id command Any unique arbitrary 32 bit value in an IP address format dotteddecimal can be used .
If this command is used on an OSPF process that is already active then the new router ID takes effect after the next reload or after amanual restarting of the OSPF process using Router clear ip ospf processRouter config router ospf 1.
Router config router router id 172 16 1 1Router clear ip ospf processBSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 44 NBMA OSPFConfiguration.
BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 45 OSPF over NBMA Topology Modes of RFC 2328 compliant modes are as follows Nonbroadcast NBMA Point to multipoint.
Additional modes from Cisco are as follows Point to multipoint nonbroadcastPoint to pointRouter config if ip ospf network broadcast non broadcast point to .
multipoint non broadcast point to point This interface command defines OSPF network type BSCI Module 3 2006 Cisco Systems Inc All rights reserved Cisco Public 46 RFC compliant Non broadcast Mode One IP subnet .
Neighbors must be manuallyTransit area 1, via interface Serial0/0/1, Cost of using 781 Transmit Delay is 1 sec, State POINT_TO_POINT, Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 00:00:07 Adjacency State FULL (Hello suppressed) Index 1/2, retransmission queue length 0, number of retransmission 1 First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0 ...

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