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CHAPTER 8: OSPF (:silhouettes: Neighbors (Requirements (Unique RID,…
CHAPTER 8:
OSPF
:silhouettes:
Neighbors
Down
Attempt
Init
2-Way
ExStart
DR/BDR Election
Highest Port Priority
Hghest RID
Exchange
DBD Exchange
Loading
LSR/LSU
Full
Requirements
Unique RID
Common Subnet
MTU
Area ID
Hello/Dead
Authentication
:warning:
Inter-Router Communication
OSPF Hello Packets
224.0.0.5 each 10 seconds
Router ID (32-bit)
router-id command
Highest Loopback interface
Highest IP address
Area-ID (32-bit)
Hello/Dead Interval
DR/BDR
Active Neighbors
Database Descriptor
Link-State Request
Link-State Update
Link-State Ack
:fountain_pen:
Network Types
Broadcast (Default)
Point-to-Point (Default in Serial)
Non-broadcast (Default in FR)
Loopback (/32)
Point-to-Multipoint (for hub&spoke)
:checkered_flag: Configuration
OSPF Network Statement
network
ip-address** wildcard
area
area-id
default-information originate [always]
Interface-Specific Configuration
ip ospf
process-id**
area
*
area-id*
Passive Interfaces
Optimizations
Link Cost
100 Mbps Reference
auto-cost refference-bandwidth
ip ospf cost
1-65535
Failure Detection
ip ospf hello-interval
ip ospf dead-interval
DR Placement
ip ospf priority