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
|
| 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
|
