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OSPF基礎知識

【OSPF】
リンク(接続)ステート(状態)型のプロトコル
→ルーターの接続状態を他のルーターに通知する

交換する接続状態→LSA(Link State Advertisement)

■OSPFパケット
OSPFで経路情報の交換等に使用されるパケットで5種類ある
①Hello
・隣接ルーターを発見
・定期的に交換し生存確認を行う

②DD
・自身が持つリンクステートデータベースの概要を相手に伝える

③LSR
・DDで入手した情報のうち自身が持っていない情報を要求する際に使用する

④LSU
・実際の経路情報をやり取りする際に使用する
・LSAをまとめたもので、一つ以上のLSAからなる

⑤LSAck
・正常にLSUを受信した事を相手に通知する

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