Installation Guide

Table 134 summarizes alternate stacking support for X620 switches.
Table 134: Alternate Stacking Ports for X620 Switches
Switch Model Type or location of Native
Stacking Ports
Alternate Stacking
Ports
Location of Alternate
Stacking Ports
X620-8t-2x
X620-10x
None 9,10 Front panel
X620-16t
X620-16x
X620-16p
None 15,16 Front panel
Note
The stacking ports on X620 switches do not support 10GBASE-T optics.
Summit X650 Stacking
For Summit X650 native stacking, install VIM1 or VIM3 versatile interface module (VIM) into the rear of
the switch. Link speeds and cable types vary depending on which VIM you selected. See #unique_167
for more information about the VIMs supported.
Table 135: Stacking Methods for X650 Switches
Stacking Method Speed per Link (HDX) Cable Type and Lengths
SummitStack
(with VIM1 module)
varies varies
SummitStack
(with VIM3-40G4X)
40 Gbps 0.5m–100m
QSFP+ only
The VIM1-SummitStack256/512 modules require a non-standard stacking cable.
Other SummitStack ports require standard SummitStack cables.
For a complete listing of compatible cables and optical transceivers, see the Extreme Optics
Compatibility website.
Note
When using native stacking on an X650 switch, data ports 23 and 24 do not function.
Summit X670 Stacking
Both X670-48x switches and X670V switches can participate in alternate stacking configurations using
SummitStack-V.
Native stacking is possible only for X670V switches.
The stacking-support option is enabled by default for all X670-48x and X670V switches. For more
information, see Enabling and Disabling the Stacking-Support Option on page 252.
Stacking Considerations for Each Switch Model
Building Stacks
268 Summit Family Hardware Installation Guide