如果在網(wǎng)絡(luò)中有其它設(shè)備在使用這個IP地址，以太網(wǎng)介面會周期性的檢測此IP地址的使用情況。以太網(wǎng)介面會不停的檢測此地址是否存在直到確認沒有其它設(shè)備使用此IP地址。另–種情況下，當(dāng)CPU通知本單元不再是激活單元或者以太網(wǎng)切換到備用單元失敗的信號被檢測到時，也停止此檢測。這意味著如果連接兩兩個單元的冗余連接失效，單元變成沒有同步的激活單元，兩兩個單元都會試圖使用這個冗余IP地址，但是只有一個可以成功。

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