S5730-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.
Stack card stacking and service port stacking (including ordinary cable stacking and dedicated stack cable stacking) cannot be used together. If service port configurations are correct, service port stacking is preferred over stack card stacking. If stack card stacking has been used to set up a stack, to use service port stacking to set up the stack, you need to restart the stack to make service port stacking takes effect after configuring service port stacking.
40GE ports on the ES5D21VST000 stack card cannot be used together with 40GE ports on the ES5D21Q04Q01 card to set up a stack.
The number of stacked switches is recommended to be 2 to 9.

**Table 1** Stack card stacking support
Device Series	Port Supporting Stacking	Stack Cable	Remarks
S5730-SI	Two stack ports on the ES5D21VST000 dedicated stack card	1 m, 3 m, and 5 m QSFP+ passive high-speed copper cables QSFP+ optical module (QSFP-40G-SR-BD not supported) and optical fiber 10 m QSFP+ AOC cable	Any models of the S5730-SI can set up a stack.