S5700-EI and S5700-SI Stack Card Stacking Support

For the cables that can be used as stack cables, see "Cables" in the Hardware Description. Using other cables may cause exceptions in the stack system, for example, frequent error-down events on stack ports.
The number of stacked switches is recommended to be 2 to 5.

**Table 1** Stack card stacking support
Device Series	Stacking-supported Port	Stack Cable	Rate of a Single Port	Remarks
S5700-SI	Two ports on each stack card	1 m PCIe cable 3 m PCIe cable (supported in V200R003 and later versions)	12 Gbit/s	All models except S5700-26X-SI-12S-AC support the stacking function. Any models of the S5700-SI series can set up a stack.
S5700-EI	Two ports on each stack card	1 m PCIe cable 3 m PCIe cable (supported in V200R002 and later versions. In V200R002, only S5700-52C-EI and S5700-28C-EI-24S support the 3 m PCIe cable. In V200R003 and later versions, all the S5700-EI series supports the 3 m PCIe cable.)	12 Gbit/s	Any models of the S5700-EI series can set up a stack.