06-Ospf Multi-Area Lsdb v0.2
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Transcript of 06-Ospf Multi-Area Lsdb v0.2
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The Implementing Cisco IP Routing - ROUTEExam: 642-902
Advanced OSPF
Multi-Area Network Types Frame Relay Options
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Intro
Link State Database LSDB
LSAs Types
OSPF Neighborship: the Process
Multi-Area OSPF Design
OSPF Network Types
OSPF over Frame Relay
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LSDB: Closer Look
R1#show ip ospf database [router | network | summary]
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OSPF Neighborship
OSPF Neighbor State FSM Down: nothing from neighbor
Attempt: neighbor statement configured
Init: hello received permanent is hello doesnd t mach
2Way: hello received with valid parameters
ExStart: negotiating DBD seq and master/slave
Exchange: exchanging DBD
Loading: inquire about certain subnets using LSR, LSU and LSAck
Full: LSDB identical
The Database Exchange Process
Initial, incremental and periodic updates
OSPF Messages
Hello 1
Database Descriptor DBD 2
Link State Request LSR 3
Link State Update LSU 4
Link State Ack LSAck 5
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LSA TYPES
LSA Types
1. Router: each router state ID, connected networks
2. Network: on transit network by DR
3. Net Summary: by ABR about subnets of other areas
4. ASBR Summary: advertise ASBR
5. AS External: external subnet redistributed into OSPF
6. Multicast OSPF (unsupported by Cisco)
7. NSSA External: external subnet redistributed into OSPF in NSSA
Area 0 Backbone
Area 2Area 1
Area 3
OSPF DomainRIP Domain
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Single Vs. Multi-Area
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OSPF Network Types
Broadcast: Ethernet/broadcast-DR/BDR election-Hello 10 sec
Point-to-point: PPP/HDLC-no DR/BDR election-Hello 10 sec
Loopback: Loopback interfaces
Nonbroadcast: Frame Relay-DR/BDR election-neighbor command-Hello 30 sec
Point-to-multipoint: no DR/BDR election-Hello 30 sec
Point-to-multipoint nonbroadcast: neighbor command-Hello 30 sec
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Nonbroadcast
Default on Frame Relay
Elect DR/BDR election
Must use neighbor command
Watch it for DR placement!
R1 Configurationinterface s0/0
encapsulation frame-relay
router ospf 1
neighbor 192.168.123.2
neighbor 192.168.123.3
R2 Configurationinterface s0/0
encapsulation frame-relay
ip ospf priority 0
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Point-to-Multipoint
The opposite of nonbroadcast
NO DR/BDR election
Must NOT use neighbor command
R1 Configurationinterface s0/0
encapsulation frame-relay
ip ospf network point-to-multipoint
R2 Configurationinterface s0/0
encapsulation frame-relay
ip ospf network point-to-multipoint
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Point-to-Multipoint Nonbroadcast
Like Point-to-Multipoint
NO DR/BDR election
Must use neighbor command
R1 Configurationinterface s0/0
encapsulation frame-relay
ip ospf network point-to-multipoint
R2 Configurationinterface s0/0
encapsulation frame-relay
ip ospf network point-to-multipoint
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Summary
OSPF Neighborship: the Process
LSAs Types and the OSPF Link State Database
Multi-Area OSPF Design
OSPF Network Types
OSPF over Frame Relay
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