Ospf basics
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Overview
- OSPF is an interior gateway protocol
Structure
- encapsulates its data directly in IP
- protocol number 89
- multicast addresses 224.0.0.5
- variety authentication methods
Router relationships
- router identifies with Hello packet
- link state protocol
- neighbor relationships
Adjacency state machine
- down
- attempt
- init
- 2-way
- exstart
- exchange
- loading
- full
Protocol messages
- Hello
- Database Description
- Link State Request
- Link State Update
- Link State Acknowledgment
OSPF Version 3
OSPF Header Version 3 | |||||||||||||||||||||||||||||||
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0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
Version |
Type |
Length | |||||||||||||||||||||||||||||
Router ID | |||||||||||||||||||||||||||||||
Area ID | |||||||||||||||||||||||||||||||
Checksum |
Instance ID |
Reserved | |||||||||||||||||||||||||||||
Data |