Stack cards and the bandwidth of the S5700

The subcards in the front slot and rear slot use the same chip that provides 4 x 10 Gbit/s bandwidth. Therefore, the S5700EI or S5700SI stacks set up in stack card connection mode have the following limitations:
A stack subcard can be used with a 2x10GE subcard. In this case, each stack port occupies 10 Gbit/s bandwidth, and on the front subcard, each port also occupies 10 Gbit/s bandwidth. A stack card cannot be used with a 4x10GE subcard. This is because the 10GE ports on the 4x10GE subcard are actually 10GE ports with their rates limited, so the actual bandwidth of the subcard is 4 x 10 Gbit/s. This subcard occupies all the 4 x 10 Gbit/s bandwidth of the chip, so there is no available bandwidth for the stack card.

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