05-Basic OSPF v0.1
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Transcript of 05-Basic OSPF v0.1
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The Implementing Cisco IP Routing - ROUTEExam: 642-902
Basic OSPF
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Intro
OSPF Introduced/Reviewed OSPF Feature
Comparing OPSF with EIGRP
Comparing Neighborship Requirement Between OSPF and EIGRP
OSPF Terminology
OSPF Tables
Configuring Basic OSPF Network Enabling OSPF
Verifying OSPF
Virtual Links
Speeding Convergence
Controlling Neighborship
Passive Interfaces
OSPF Authentication
Tweaking OSPF Metric Calculations
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OSPF Introduced/Reviewed
OSPF Features:
Open Link State IGP, Supports VLSM, Fast Convergence and complex design and
configuration
Uses 224.0.0.5 and 224.0.0.6 , IP Protocol ID 89
Build LSDB (all routers, their networks and their neighbors) exchanging LSA
Comparing OPSF with EIGRP
LS Vs. DV
Multiple of tables
Summarization place
Neighborship requirements
Design complexity and algorithm
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OSPF Terminology
Areas: Backbone, Normal and Stub Area
Area Border Router ABR and Autonomous Border Router ASBR
Shortest Path First SPF
Link State Update LSU and Link State Advertisement LSA
Backbone router and internal routers
Designated Router DR and Backup Designated Router BDR
Area 0 Backbone
Area 2Area 1
Area 3
OSPF Domain
RIP Domain
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OSPF Tables
Neighbor Table
Neighboring Conditions
Hello and Dead intervals
Area ID
Authentication
Stub Flag
MTU size
Database Table
Routing Table
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Configuring Basic OSPF Network
Enabling OSPFrouter ospf 1
network 192.168.1.1 0.0.0.0 area 0
Or
interface loopback 1
ip ospf 1 area 0
Verifying OSPFshow ip protocol
show ip route ospf
show ip ospf neighbor
show ip ospf interface [brief]
show ip ospf database
Router ID Hard-coded ID by route-idaddress command
Highest IP address of loopback interface
Highest IP address of physical interface
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Virtual Links
Design Issue
The need for advertised router ID
Configuring VL
R3
router ospf 1
area 1 virtual-link 192.168.2.2
R2
router ospf 1
area 1 virtual-link 192.168.3.3
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SpeedingConvergence
Interface level commands
interface fa0/0
ip ospf hello 2
ip ospf dead-interval 6
Or
ip ospf dead-interval minimal hello-multiplier 3
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Controlling Neighborship
Passive Interfaces
OSPF Authentication
Authentication Types
0 = Null
1 = Clear Text
2 = MD5
Configuration
Clear Text
ip ospf authentication
ip ospf authentication-key cisco
MD5
ip authentication message-digest
ip ospf message-digest-key 1 md5 cisco
Area Level
area 0 authentication
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Tweaking OSPF Cost
OSPF Metric Calculation
Cost = 100 Mbps / Int Bw
Tweaking OSPF Cost
Changing interface Bw
Changing Ref Bw
Manually adjusting cost
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Summary
OSPF Introduced/Reviewed OSPF Feature
Comparing OPSF with EIGRP
Comparing Neighborship Requirement Between OSPF and EIGRP
OSPF Terminology
OSPF Tables Configuring Basic OSPF Network
Enabling OSPF
Verifying OSPF
Virtual Links
Speeding Convergence
Controlling Neighborship Passive Interfaces
OSPF Authentication
Tweaking OSPF Metric Calculations
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