OSPF Cheat Sheet ⋆ IpCisco

OSPF Mobil Uyumlu Accordion Cheat Sheet

OSPF Administrative Distance (Preference)

Cisco	110
Nokia	10 (Internal), 150 (External)
Huawei	10 (Internal), 150 (External)
Juniper	10 (Internal), 150 (External)

OSPF Router Types

Internal R.: Router in a Single Area
Backbone R.: Routers in Area 0
ABR: Routers connected to multiple areas
ASBR: Routers connected to another Autonomous System

OSPF General

Uses Dijkstra’s SPF Algorithm
Link State Routing Protocol
Classless Routing Protocol
Open and Standard Protocol

OSPF Network Types

Broadcast (Cisco)
NBMA (Nonbroadcast Multi Access)
Point-to-Point (Cisco)
Point-to-Multipoint
Point-to-Multipoint Non Broadcast

OSPF Area Types

Standard Area
Backbone Area (Area 0)
Stub Area
NSSA (Not So Stubby Area)
Totally Stub Area
Totally NSSA

OSPF Routing Table Abbreviations

O	Intra area route
O IA	Inter area route
O E1 / E2	External routes
O N1/N2	NSSA routes
E1	Cost to ASBR + Advertised External Cost
E2	Advertised External Cost

OSPF Multicast Addresses

224.0.0.5	All Routers
224.0.0.6	All DRs

Packet Types

Hello
DBD
LSR
LSU
LSAck

OSPF Tables

Neighbor Table
Topology Table
Routing Table

gokhankosem

Gokhan Kosem is a Network Engineer, Instructor and the Founder of IPCisco.com with 15+ years of experience in Cisco, Nokia, Huawei, Juniper, Linux, Service Provider Networks, Routing and Switching technologies.

He has worked on the backbone networks of major service providers and network vendors including Nortel, Alcatel-Lucent (Nokia) and has extensive hands-on experience with Cisco, Huawei, Juniper and Nokia networking technologies.

He has trained thousands of networking students worldwide through IPCisco.com, Udemy, books, labs, quizzes, and educational content across multiple social media platforms.

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OSPF Mobil Uyumlu Accordion Cheat Sheet

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