Available Stacking Methods

Each ExtremeSwitching switch model can use various methods of stacking.

SummitStacking by Stacking Method shows the switch models that can participate in each stacking method.

Table 1. SummitStacking by Stacking Method
Stacking Method	Speed per Link (HDX)	Cable Type and Lengths	Switch Models
SummitStack-V	10 Gbps	0.5 m - 40 km SFP+ (with SR, LR, and ER)	ExtremeSwitching 5520 (using 5520-VIM-4X) Note: The 5520 switches can stack with 5320 switches or 5420 switches by installing a 5520-VIM-4X into the 5520 switches.
SummitStack-V40	10 Gbps	0.5 m - 40 m SFP+ (with SR and LR)	ExtremeSwitching 5320 (ports U1, U2) Note: The 5320 switches can stack with themselves, the 5420 or 5520 switches using 5520-VIM-4X ports. ExtremeSwitching 5420 (ports U1, U2) Note: The 5420 switches can stack with themselves, 5320 switches, or 5520 switches.
SummitStack-V80	20 Gbps	0.5 m - 5 m SFP-DD	ExtremeSwitching 5420 (ports U1, U2) Note: The 5420 switches can stack with themselves and ExtremeSwitching 5520 (ports U1 and U2) when configured for SummitStack-V80.
SummitStack-V160	40 Gbps	0.5 m - 40 kM QSFP+ only	ExtremeSwitching 5520 (ports U1, U2) Note: If you use SummitStack-V160, 5520 switches can stack only with themselves. To stack with 5320 and 5420 switches, the 5520 can use either SummitStack-V80 on ports U1 and U2 or SummitStack-V on the alternate stack ports (Using a 5520-VIM-4X).
SummitStack-V200	50 Gbps	0.5 m - 100 m QSFP28 only	ExtremeSwitching 5520 (ports U1, U2) Note: If you use SummitStack-V200, 5520 switches can stack only with themselves or 5720 switches.
SummitStack-V400	106 Gbps	0.5 m - 100 m QSFP28 only	ExtremeSwitching 5720 (ports U1, U2) Note: If you use SummitStack-V400, 5720 switches can only stack with themselves. Note: No VIM ports can be configured as stack ports for 5720 switches.
SummitStack-V400 Alternative Configuration	100 Gbps	V400 Alternative Configuration is required when using specific fiber cables. This mode sets the stack ports to 100G, enables pre-emphasis, and FEC (clause_91). QSFP28 SR4 QSFP28 LR4 QSFP28 CWDM4 QSFP28 PSM4 QxQ AOC cable - 5m QxQ AOC cable - 7m QxQ AOC cable - 10m QxQ AOC cable - 20m	ExtremeSwitching 5720 (ports U1, U2) Note: If you use SummitStack-V400 Alternative Configuration, 5720 switches can only stack with themselves. Note: No VIM ports can be configured as stack ports for 5720 switches.

For more details about the stacking methods that are available for each switch series, see the hardware installation guide for your switch.

Note

All switches in the stack must run the same version of ExtremeXOS.