OPERATIONAL DEFECT DATABASE
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"IOS crypto engine alloc AR window 65535 Bytes" log generated around every 15s, this is a cosmetic issue and should not affect the Router or tunnel configuration.
ipsec tunnel configured with or without anti replay check (crypto ipsec security-association replay disable)
implement a logging discriminator: eg. logging discriminator AR msg-body drops alloc AR window logging buffered discriminator AR
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