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MACSec: Extended packet numbering

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    MACSec: Extended packet numbering

    MACsec extended packet numbering (XPN) support for Ethernet interfaces (40GbE, 100GbE, and 400GbE). You enable this functionality by selecting the GCM-AES-XPN-128 or GCM-AES-XPN-256 cipher suite. You must enable the XPN function on all interfaces at 40-Gbps speed or more.
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