S5720-HI and S5730-HI Service Port 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.
Combo ports cannot function as stack member ports.
For stacking-supported service ports, some of them can be used as stack ports, whereas some can be used as ordinary service ports.
Since V200R011C10, S5720-HI series switches can set up stacks in service port stacking mode using dedicated stack cables. S5730-HI series switches of all versions can set up stacks in service port stacking mode using dedicated stack cables.
The number of stacked switches is recommended to be 2 to 9.

**Table 1** Service port stacking support
Device Series	Port Supporting Stacking	Stack Cable	Rate of a Single Port	Remarks
S5720-HI	Four 10GE SFP+ optical ports	1 m, 3 m, and 5 m SFP+ passive high-speed copper cables 10 m SFP+ active high-speed copper cables 3 m and 10 m AOC cables 10GE SFP+ optical module and optical fiber 0.5 m and 1.5 m SFP+ dedicated stack cables (supported in V200R011C10 and later versions)	10 Gbit/s	Any models of the S5720-HI series can set up a stack. A switch supports a maximum of two logical stack ports, and each logical stack port supports a maximum of eight stack member ports. Each switch can use a maximum of eight service ports as stack member ports. NOTE: An S5720-HI supports the stacking function since V200R009C00. When a member device in a stack is faulty and fails to restart for three consecutive times, the device attempts to roll back to a version earlier than V200R009C00 for restart. When the device restarts successfully after rolling back to a version earlier than V200R009C00, a multi-active situation may occur because the version earlier than V200R009C00 does not support the stacking function. To prevent this situation, you are advised to delete the system software earlier than V200R009C00 from member devices when using S5720-HIs to set up a stack.
S5720-HI	Optical ports on a 4-port 10GE interface card	1 m, 3 m, and 5 m SFP+ passive high-speed copper cables 10 m SFP+ active high-speed copper cables 3 m and 10 m AOC cables 10GE SFP+ optical module and optical fiber	10 Gbit/s
S5730-HI	Four 10GE SFP+ optical ports	1 m, 3 m, and 5 m SFP+ passive high-speed copper cables 10 m SFP+ active high-speed copper cables 3 m and 10 m AOC cables 10GE SFP+ optical module and optical fiber 0.5 m and 1.5 m SFP+ dedicated stack cables	10 Gbit/s	Any models of the S5730-HI series can set up a stack. Two types of ports on a switch can be both configured as stack ports, and each logical stack port can contain only one type of ports. When 10GE ports are used as stack ports, a switch supports a maximum of two logical stack ports, and each logical stack port supports a maximum of eight stack member ports. Each switch can use a maximum of twelve service ports as stack member ports. When 40GE ports are used as stack ports, a switch supports a maximum of two logical stack ports, and each logical stack port supports a maximum of two stack member ports. Each switch can use a maximum of two service ports as stack member ports. 40GE ports do not support the stacking function after they are split into 10GE ports.
	Optical ports on an 8-port 10GE interface card	1 m, 3 m, and 5 m SFP+ passive high-speed copper cables 10 m SFP+ active high-speed copper cables 3 m and 10 m AOC cables 10GE SFP+ optical module and optical fiber	10 Gbit/s
	Electrical ports on an 8-port 10GE interface card	Category 6A or higher network cables (If Category 6 cables are used, ensure that the cables meet requirements of TSB-155.)	10 Gbit/s
	Optical ports on a 2-port 40GE interface card	1 m, 3 m, and 5 m QSFP+ passive high-speed copper cables QSFP+ optical module and optical fiber (QSFP-40G-SR-BD optical modules can be used for stack since V200R019C10SPC500.) 10 m QSFP+ AOC cable	40 Gbit/s