Using SummitStack-V320 Stacking

A stacking rate of 320 Gbps can be achieved across a stack of X670-G2-48x-4q and X770 switches using the QSFP+ connection and cables. These switches can use 80-Gbps stacking connections that provide 320 Gbps full-duplex bandwidth.

A stacking rate of 320 Gbps can be achieved across a stack of X480 (with VIM3-40G4X), X650 (with VIM3-40G4X), X670V (with VIM4-40G4X), and X770 switches using the QSFP+ connection and cables. These switches can use 80-Gbps stacking connections that provide 320 Gbps full-duplex bandwidth.

The following figure shows an example of a SummitStack-V320 stack using Summit X670 and X650 series switches.

Slot 1: Summit X670V-48x switch with VIM4-40G4X

Slot 2: Summit X670V-48x switch with VIM4-40G4X

Slot 3: Summit X650 series switch with VIM3-40G4X

SummitStack V-320 stacking can be done with installable modules or using front panel ports, depending upon the type of switch you have. For SummitStack V-320 Stacking using the VIM3-40G4X and VIM4-40G4X modules, connections between the stacking ports must be done using paired bundles of physical ports. V320 stacking will not function unless the physical ports on the modules are paired to form stacking ports. Port Pairings Using Installable Modules lists the port pairings using installable modules.

Table 1. Port Pairings Using Installable Modules
VIM3-40G4X		VIM4-40G4X
Paired physical ports	Stacking port	Paired physical ports	Stacking port
S1 and S3	S1	S1 and S3	S1
S2 and S4	S2	S2 and S4	S2

Recommended Order for Connecting Stacking Ports lists the recommended order for connecting the stacking ports in the example stack shown in Example SummitStack-V320 Configuration.

Table 2. Recommended Order for Connecting Stacking Ports
Connect this slot and port . . .		. . . To this slot and port
Slot 1	Stack Port 2 (physical ports 2 and 4)	Slot 2	Stack Port 1 (physical ports 1and 3)
Slot 2	Stack Port 2 (physical ports 2 and 4)	Slot 3	Stack Port 1 (physical ports 1 and 3)
Slot 3	Stack Port 2 (physical ports 2 and 4)	Slot 1	Stack Port 1 (physical ports 1 and 3)

Note

SummitStack-V320 stacking can be mixed with V160, V80, and 10G alternate port stacking. For example, a Summit X460 with SummitStack-V80 could be added to the sample stack in Example SummitStack-V320 Configuration. However, you must restrict the speed of the ports on the VIM3-40G4X and VIM4-40G4X that connect to any ports on nodes operating at slower speeds. To reduce the speed of ports on the VIM3-40G4X or VIM4-40G4X, use the configure stacking-support stack-ports selection command. For more information about configuring stacking ports, see the ExtremeXOS 16.2 User Guide .

Physical Port Pairings for Front Panel Ports lists the port pairings for SummitStack V-320 using the front panel ports on the Summit X770 switch.

Table 3. Physical Port Pairings for Front Panel Ports
Summit X770-32q
Paired physical ports	Stacking port
101 and 103	S1
102 and 104	S2