The Scots got their Autumn Nations Series campaign off to a flying start at the weekend with a 57-17 win over Fiji.
But Cummings knows that the Springboks will be a much tougher nut to crack when they visit Murrayfield.
Glasgow lock He said: "The Fijians are big guys and they hit hard and carry hard at you. So in that sense it's definitely a good sort of prep for what we're going to face on Sunday.
"But South Africa is a step up. We'll be expecting a tough challenge. They've been backto-back world champions. We're going to be playing against some of the best-but we're excited for it.
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