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In general, "performance" mode there's no bandwidth bottleneck to/from an edge port.
For example, a 6509, with a sup720B supports 40 Gbps to a line card. So, when the 6708 was released, you could run it in performance mode, where only 4 of its 8 10g ports are enabled (providing each port 10g to/from the fabric) or you could run the card in normal mode, where a pair of 10g ports shared 10g to/from the fabric. The latter being considered 2:1 oversubscription.
