OSPF – Routing Protocol – Enterprise Network

OSPF — Routing Protocol — Enterprise Network (Mindmap)

Tài liệu gồm:

Bản đồ tư duy (mindmap / infographic) SVG — nhanh hiểu cấu trúc OSPF.
Module HTML
Lab thực hành multi-area OSPF (Packet Tracer / GNS3) — sơ đồ, bảng địa chỉ, cấu hình IOS cho từng router, kiểm tra và troubleshooting checklist.

1) Mindmap / Infographic (SVG)

Dán trực tiếp SVG dưới đây vào trang HTML hoặc dùng như file độc lập ospf-mindmap.svg.

<!-- OSPF Mindmap SVG - lightweight, responsive -->
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 800" width="1200" height="800">
  <style>
    .title{font:700 28px/1.2 Arial, Helvetica, sans-serif}
    .node{font:600 14px Arial}
    .sub{font:400 12px Arial}
    .box{fill:#0b3d91;opacity:0.95;stroke:#fff;stroke-width:1.5}
    .pill{fill:#f4f9ff;stroke:#0b3d91;stroke-width:1}
    .link{stroke:#0b3d91;stroke-width:2}
  </style>

  <rect width="100%" height="100%" fill="#ffffff"/>
  <text x="60" y="50" class="title">OSPF — Routing Protocol — Enterprise Network (Mindmap)</text>

  <!-- Central -->
  <g transform="translate(80,110)">
    <rect x="0" y="0" width="240" height="80" rx="12" class="box"/>
    <text x="120" y="30" fill="#fff" font-size="18" font-weight="700" text-anchor="middle">OSPF</text>
    <text x="120" y="54" fill="#fff" font-size="12" text-anchor="middle">Link-State / Dijkstra / Area</text>
  </g>

  <!-- Areas -->
  <g transform="translate(380,40)">
    <line x1="0" y1="90" x2="120" y2="40" class="link"/>
    <rect x="120" y="20" width="220" height="70" rx="8" class="pill"/>
    <text x="230" y="45" class="node">Area Structure</text>
    <text x="230" y="63" class="sub">Backbone (0), Regular, Stub, NSSA</text>
  </g>

  <!-- LSAs -->
  <g transform="translate(380,150)">
    <line x1="0" y1="40" x2="120" y2="90" class="link"/>
    <rect x="120" y="70" width="220" height="90" rx="8" class="pill"/>
    <text x="230" y="98" class="node">LSA Types</text>
    <text x="230" y="116" class="sub">1 Router, 2 Network, 3 Summary, 5 External, 7 NSSA</text>
  </g>

  <!-- Roles -->
  <g transform="translate(380,280)">
    <line x1="0" y1="40" x2="120" y2="140" class="link"/>
    <rect x="120" y="120" width="220" height="90" rx="8" class="pill"/>
    <text x="230" y="148" class="node">Router Roles</text>
    <text x="230" y="166" class="sub">Internal, ABR, ASBR, Backbone</text>
  </g>

  <!-- Operations -->
  <g transform="translate(40,260)">
    <line x1="240" y1="40" x2="360" y2="120" class="link"/>
    <rect x="-20" y="120" width="280" height="110" rx="8" class="pill"/>
    <text x="120" y="148" class="node">Operation</text>
    <text x="120" y="166" class="sub">Hello, Adjacency, LSDB, SPF, RIB</text>
  </g>

  <!-- Tuning -->
  <g transform="translate(40,420)">
    <line x1="240" y1="40" x2="360" y2="220" class="link"/>
    <rect x="-20" y="220" width="280" height="110" rx="8" class="pill"/>
    <text x="120" y="248" class="node">Tuning & Security</text>
    <text x="120" y="266" class="sub">Auth MD5/SHA, passive-if, summarization</text>
  </g>

  <!-- Enterprise -->
  <g transform="translate(740,120)">
    <line x1="0" y1="40" x2="120" y2="80" class="link"/>
    <rect x="120" y="60" width="310" height="120" rx="8" class="pill"/>
    <text x="275" y="90" class="node">Enterprise Architecture</text>
    <text x="275" y="110" class="sub">Access - Distribution - Core (Area design)</text>
    <text x="275" y="128" class="sub">Monitoring: SNMP, NetFlow, OSPF counters</text>
  </g>

  <!-- Commands box -->
  <g transform="translate(740,320)">
    <rect x="120" y="60" width="310" height="70" rx="6" class="pill"/>
    <text x="280" y="94" class="node">Cisco Quick Commands</text>
    <text x="280" y="112" class="sub">router ospf 1 · network · show ip ospf neighbor</text>
  </g>

</svg>

2) HTML module chuẩn SEO (full-page)

File: ospf-seo-module.html. Copy-paste toàn bộ vào file .html và deploy.

<!doctype html>
<html lang="vi">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>OSPF — Routing Protocol & Enterprise Network | Học CCNA / CCNP ENCOR</title>
<meta name="description" content="Tổng quan OSPF, cấu trúc multi-area, LSA types, cấu hình Cisco IOS và lab thực hành cho CCNA & CCNP ENCOR.">
<link rel="canonical" href="https://yoursite.example/ospf-routing-enterprise" />

<!-- Open Graph -->
<meta property="og:type" content="article">
<meta property="og:title" content="OSPF — Routing Protocol & Enterprise Network">
<meta property="og:description" content="Tổng quan OSPF, cấu trúc multi-area, LSA types, cấu hình Cisco IOS và lab thực hành.">
<meta property="og:image" content="/images/ospf-infographic.png">

<!-- JSON-LD Article Schema -->
<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "Article",
  "headline": "OSPF — Routing Protocol & Enterprise Network",
  "description": "Tổng quan OSPF, cấu trúc multi-area, LSA types, cấu hình Cisco IOS và lab thực hành.",
  "image": "/images/ospf-infographic.png",
  "author": {"@type":"Person","name":"Tên tác giả"},
  "publisher": {"@type":"Organization","name":"YourSite","logo":{"@type":"ImageObject","url":"/images/logo.png"}},
  "datePublished": "2025-10-17",
  "mainEntityOfPage": {"@type":"WebPage","@id":"https://yoursite.example/ospf-routing-enterprise"}
}
</script>

<!-- Simple styling -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.8.0/styles/default.min.css">
<style>
  :root{font-family:Inter,Arial,Helvetica,sans-serif}
  body{margin:0;padding:0;background:#0f1724;color:#e6eef8}
  .container{max-width:980px;margin:36px auto;padding:28px;background:#07102a;border-radius:12px}
  h1{font-size:28px;margin-bottom:6px}
  .meta{color:#9fb0d6;font-size:14px}
  pre{background:#02102a;padding:12px;border-radius:8px;overflow:auto}
  .svg-wrap{text-align:center;margin:18px 0}
  .lab{background:#081426;padding:12px;border-radius:8px}
</style>
</head>
<body>
  <main class="container">
    <h1>OSPF — Routing Protocol & Enterprise Network</h1>
    <p class="meta">Guide: CCNA → CCNP ENCOR • Updated: Oct 17, 2025</p>

    <section>
      <h2>Mindmap (Quick visual)</h2>
      <div class="svg-wrap">
        <!-- Inline SVG mindmap (copy from ospf-mindmap.svg) -->
        <!-- For space we reference external img; replace src with actual svg file or embed above -->
        <img src="/images/ospf-mindmap.svg" alt="OSPF Mindmap" style="max-width:100%;height:auto;border-radius:8px;box-shadow:0 8px 20px rgba(0,0,0,0.6)">
      </div>
    </section>

    <section>
      <h2>Quick Concepts</h2>
      <ul>
        <li>OSPF — Link-State protocol using Dijkstra; IP Protocol 89</li>
        <li>Area 0 backbone; ABR, ASBR, Internal routers</li>
        <li>LSA types: 1,2,3,4,5,7 — control scope</li>
      </ul>
    </section>

    <section>
      <h2>Example Cisco IOS Config (Multi-Area)</h2>
      <div class="lab">
<pre><code class="language-bash">! R1 (Backbone - Area 0)
hostname R1
interface Gig0/0
 ip address 10.0.0.1 255.255.255.0
 no shutdown
!
router ospf 1
 router-id 1.1.1.1
 network 10.0.0.0 0.0.0.255 area 0
!
! R2 (ABR connecting Area 0 and Area 10)
hostname R2
interface Gig0/0
 ip address 10.0.0.2 255.255.255.0
interface Gig0/1
 ip address 10.10.10.1 255.255.255.0
!
router ospf 1
 router-id 2.2.2.2
 network 10.0.0.0 0.0.0.255 area 0
 network 10.10.10.0 0.0.0.255 area 10
!
! R3 (Area 10 internal)
hostname R3
interface Gig0/0
 ip address 10.10.10.2 255.255.255.0
!
router ospf 1
 router-id 3.3.3.3
 network 10.10.10.0 0.0.0.255 area 10
</code></pre>
      </div>
    </section>

    <section>
      <h2>Lab Download / Copy</h2>
      <p>Copy the configs above into Packet Tracer or GNS3 devices. For GNS3, add 3 routers, connect and set interfaces accordingly. Use the commands:</p>
      <pre><code class="language-bash">show ip ospf neighbor
show ip ospf database
show ip route ospf
debug ip ospf adj
</code></pre>
    </section>

    <section>
      <h2>References & Further Reading</h2>
      <ol>
        <li>RFC 2328 — OSPFv2</li>
        <li>RFC 5340 — OSPFv3</li>
        <li>Cisco CCNP ENCOR Official Cert Guide</li>
      </ol>
    </section>

  </main>

<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.8.0/highlight.min.js"></script>
<script>hljs.highlightAll();</script>
</body>
</html>
</code style="background: #5b8cff;">

3) Lab thực hành: Multi-Area OSPF (Packet Tracer / GNS3)

Topology (logical):

            [R1] (10.0.0.0/24) Area 0 (Backbone)
             |
       -----+-----
      |           |
    [R2]        [R4]
    ABR         ABR/ASBR
   /   \         |
Area10  Area20  Internet/BGP
 [R3]   [R5]
</code >

IP addressing plan (example)

R1–R2 link: 10.0.0.0/24 (R1:10.0.0.1, R2:10.0.0.2) — Area 0
R2–R3 link: 10.10.10.0/24 (R2:10.10.10.1, R3:10.10.10.2) — Area 10
R1–R4 link: 10.0.1.0/24 (R1:10.0.1.1, R4:10.0.1.2) — Area 0
R4–R5 (NSSA): 10.20.20.0/24 (R4:10.20.20.1, R5:10.20.20.2) — Area 20 (NSSA)

Complete sample IOS configs (ready-to-paste)

R1 (Backbone):

hostname R1
interface Gig0/0
 ip address 10.0.0.1 255.255.255.0
 no shutdown
interface Gig0/1
 ip address 10.0.1.1 255.255.255.0
 no shutdown
router ospf 1
 router-id 1.1.1.1
 network 10.0.0.0 0.0.0.255 area 0
 network 10.0.1.0 0.0.0.255 area 0
!

R2 (ABR: Area 0 <-> Area 10):

hostname R2
interface Gig0/0
 ip address 10.0.0.2 255.255.255.0
 no shutdown
interface Gig0/1
 ip address 10.10.10.1 255.255.255.0
 no shutdown
router ospf 1
 router-id 2.2.2.2
 network 10.0.0.0 0.0.0.255 area 0
 network 10.10.10.0 0.0.0.255 area 10
!

R3 (Area 10 internal):

hostname R3
interface Gig0/0
 ip address 10.10.10.2 255.255.255.0
 no shutdown
router ospf 1
 router-id 3.3.3.3
 network 10.10.10.0 0.0.0.255 area 10
!

R4 (ABR/ASBR — inject external routes; Area 0 & Area 20 NSSA):

hostname R4
interface Gig0/0
 ip address 10.0.1.2 255.255.255.0
 no shutdown
interface Gig0/1
 ip address 10.20.20.1 255.255.255.0
 no shutdown
router ospf 1
 router-id 4.4.4.4
 network 10.0.1.0 0.0.0.255 area 0
 network 10.20.20.0 0.0.0.255 area 20
!
! Example: advertise a static default into OSPF (as type 5) from R4
ip route 0.0.0.0 0.0.0.0 203.0.113.1
router ospf 1
 redistribute static subnets
!

R5 (Area 20 internal / NSSA network):

hostname R5
interface Gig0/0
 ip address 10.20.20.2 255.255.255.0
 no shutdown
router ospf 1
 router-id 5.5.5.5
 network 10.20.20.0 0.0.0.255 area 20
!

NSSA + redistribution notes

If Area 20 is configured as NSSA, external routes redistributed there become Type‑7 LSAs and are translated to Type‑5 at the ABR if needed.
To configure NSSA on ABR: area 20 nssa under router ospf on ABR side.

Verification & Troubleshooting checklist

show ip ospf neighbor — adjacency up, state FULL
show ip ospf interface — hello/dead timers, MTU
show ip ospf database — LSAs present (types expected)
show ip route — OSPF learned prefixes
debug ip ospf adj / debug ip ospf events — use carefully in lab
Common issues: area mismatch, passive interface, mismatched auth, MTU mismatch, wrong network statements

Packet Tracer tips

Use 2801/1841 images or ISR models that support OSPF.
Configure serial or Gigabit links and ensure clock rates for serials if needed.

Bonus: Suggested lab tasks (progressive)

Single-area OSPF with 3 routers (area 0) — validate neighbor states.
Convert to multi-area: add ABR and area 10 — observe LSAs type 3 summarization.
Configure NSSA on Area 20 and redistribute a static route at R4 — confirm Type‑7 -> Type‑5 behavior.
Add route summarization on ABR: area 10 range 10.10.0.0 255.255.0.0 and test.
Simulate failure: shut down R2 link — watch SPF recalculation and convergence time.

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