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• If you enable both IPsec and QoS on an interface, traffic of an IPsec SA might be put into different
queues by QoS, causing some packets to be sent out of order. As IPsec performs anti-replay
operation, packets outside the anti-replay window in the inbound direction might be discarded,
resulting in packet loss. When using IPsec together with QoS, make sure the characteristics of traffic
in IPsec are the same as traffic classification in QoS.
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