如果在網(wǎng)絡(luò)中有其它設(shè)備在使用這個(gè)IP地址，以太網(wǎng)介面會(huì)周期性的檢測(cè)此IP地址的使用情況。以太網(wǎng)介面會(huì)不停的檢測(cè)此地址是否存在直到確認(rèn)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(hào)被檢測(cè)到時(shí)，也停止此檢測(cè)。這意味著如果連接兩兩個(gè)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(gè)單元都會(huì)試圖使用這個(gè)冗余IP地址，但是只有一個(gè)可以成功。

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