发送arp信息可以使这个冗余IP地址指定到这个新的激活单元上。此时以太网介面响应冗余IP和直接IP两两个地址。当CPU被命令产生egd数据时，激活单元中的以太网介面检验是否获得了冗余IP地址。以太网介面获得IP地址之前以太网介面不会发送egd数据。

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