S5731-H and S5731S-H 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.
S5731-H and S5731S-H 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
S5731-H	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 S5731-H 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 SFP+ optical 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 four stack member ports. Each switch can use a maximum of four service ports as stack member ports. When electrical ports on an 8-port 10GE interface card or optical ports on a 2-port 25GE interface card working in 8 x 10GE mode 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 eight service ports as stack member ports. When optical ports on a 2-port 40GE interface card or a 2-port 25GE interface card working in 2 x 25GE mode 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 a 2-port 25GE interface card working in 8 x 10GE mode This card is supported in V200R019C10 and later versions.		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
	Optical ports on a 2-port 25GE interface card working in 2 x 25GE mode This card is supported in V200R019C10 and later versions.	1m, 3 m, 5 m (passive) SFP28 cables 3m, 5m, 7m, and 10m SFP28 AOC cables SFP28 optical module and fiber	25 Gbit/s
S5731S-H	Four SFP optical ports 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 S5731S-H series can set up a stack. A stack cannot be set up between the S5731S-H and S5731-H. 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 SFP optical ports or 10GE SFP+ optical 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 four stack member ports.. Each switch can use a maximum of four service ports as stack member ports. When electrical ports on an 8-port 10GE interface card or optical ports on a 2-port 25GE interface card working in 8 x 10GE mode 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 eight service ports as stack member ports. When optical ports on a 2-port 40GE interface card or a 2-port 25GE interface card working in 2 x 25GE mode 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 a 2-port 25GE interface card working in 8 x 10GE mode This card is supported in V200R019C10 and later versions.		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
	Optical ports on a 2-port 25GE interface card working in 2 x 25GE mode This card is supported in V200R019C10 and later versions.	1m, 3 m, 5 m (passive) SFP28 cables 3m, 5m, 7m, and 10m SFP28 AOC cables SFP28 optical module and fiber	25 Gbit/s