OSPF LSA Types (1–7), Area Types & External Routes (E1 vs E2) Explained

Описание: 𝗪𝗲 𝗯𝗿𝗲𝗮𝗸 𝗱𝗼𝘄𝗻 𝗮𝗹𝗹 𝗢𝗦𝗣𝗙 𝗟𝗦𝗔 𝗧𝘆𝗽𝗲𝘀 (𝟭 𝘁𝗼 𝟳), 𝗲𝘅𝗽𝗹𝗮𝗶𝗻 𝗱𝗶𝗳𝗳𝗲𝗿𝗲𝗻𝘁 𝗢𝗦𝗣𝗙 𝗔𝗿𝗲𝗮 𝗧𝘆𝗽𝗲𝘀, 𝗮𝗻𝗱 𝗰𝗹𝗲𝗮𝗿𝗹𝘆 𝗱𝗶𝗳𝗳𝗲𝗿𝗲𝗻𝘁𝗶𝗮𝘁𝗲 𝗯𝗲𝘁𝘄𝗲𝗲𝗻 𝗘𝘅𝘁𝗲𝗿𝗻𝗮𝗹 𝗥𝗼𝘂𝘁𝗲 𝗧𝘆𝗽𝗲𝘀 𝗘𝟭 𝗮𝗻𝗱 𝗘𝟮. 𝗧𝗵𝗶𝘀 𝘀𝗲𝘀𝘀𝗶𝗼𝗻 𝗶𝘀 𝗱𝗲𝘀𝗶𝗴𝗻𝗲𝗱 𝘁𝗼 𝗵𝗲𝗹𝗽 𝘆𝗼𝘂 𝗺𝗮𝘀𝘁𝗲𝗿 𝗢𝗦𝗣𝗙 𝗰𝗼𝗻𝗰𝗲𝗽𝘁𝘀 𝗿𝗲𝗾𝘂𝗶𝗿𝗲𝗱 𝗳𝗼𝗿 𝗖𝗖𝗡𝗔, 𝗖𝗖𝗡𝗣 𝗘𝗻𝘁𝗲𝗿𝗽𝗿𝗶𝘀𝗲, 𝗮𝗻𝗱 𝗿𝗲𝗮𝗹-𝘄𝗼𝗿𝗹𝗱 𝗿𝗼𝘂𝘁𝗶𝗻𝗴 𝘁𝗿𝗼𝘂𝗯𝗹𝗲𝘀𝗵𝗼𝗼𝘁𝗶𝗻𝗴.

If you’ve ever been confused about how LSAs are generated, how areas control LSA flooding, or how E1 and E2 routes are calculated — this video will give you complete clarity.

🔍 𝗧𝗼𝗽𝗶𝗰𝘀 𝗖𝗼𝘃𝗲𝗿𝗲𝗱:
✅ OSPF LSA Types Explained

Type 1 – Router LSA
Type 2 – Network LSA
Type 3 – Summary LSA
Type 4 – ASBR Summary LSA
Type 5 – External LSA
Type 6 – Multicast LSA (Overview)
Type 7 – NSSA External LSA

✅ 𝗢𝗦𝗣𝗙 𝗔𝗿𝗲𝗮 𝗧𝘆𝗽𝗲𝘀 𝗘𝘅𝗽𝗹𝗮𝗶𝗻𝗲𝗱

Backbone Area (Area 0)
Normal Area
Stub Area
Totally Stubby Area
NSSA (Not-So-Stubby Area)
Totally NSSA
We also explain:
Which LSAs are allowed in each area
Why stub areas reduce routing table size
Real-world design considerations

✅ 𝗘𝘅𝘁𝗲𝗿𝗻𝗮𝗹 𝗥𝗼𝘂𝘁𝗲 𝗧𝘆𝗽𝗲𝘀: 𝗘𝟭 𝘃𝘀 𝗘𝟮

What is E1 (External Type 1)
What is E2 (External Type 2)
Cost calculation difference
When to use E1 vs E2
Redistribution examples

🎯 𝗪𝗵𝗼 𝗦𝗵𝗼𝘂𝗹𝗱 𝗪𝗮𝘁𝗰𝗵:

CCNA Aspirants
CCNP Enterprise Aspirants
Network Engineers
Routing & Switching Learners
OSPF Interview Preparation Candidates

📘 𝗕𝘆 𝘁𝗵𝗲 𝗲𝗻𝗱 𝗼𝗳 𝘁𝗵𝗶𝘀 𝘃𝗶𝗱𝗲𝗼, 𝘆𝗼𝘂’𝗹𝗹 𝗰𝗹𝗲𝗮𝗿𝗹𝘆 𝘂𝗻𝗱𝗲𝗿𝘀𝘁𝗮𝗻𝗱:

How OSPF LSAs work
How different area types control LSA flooding
The difference between E1 and E2 routes
How OSPF builds its routing table

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