Installation Guide

Table 93 summarizes stacking support for X870 switches.
Note
Only QSFP28 direct-attach passive copper cable, at lengths up to 5 meters, can be used in
X870 stacking ports.
Table 93: Stacking Methods for X870 Switches
Stacking Method Speed per Link (HDX) Cable Type and Lengths
SummitStack-V400 (Front panel ports 121,125) 106 Gbps 0.5m - 20m
QSFP28
Selecting Native and Alternate Stacking Ports
On switches that provide both native stacking ports and alternate stacking ports (described in Stacking
Considerations for Each Switch Model on page 196), you can configure each logical stacking port to use
either the native stacking port or the alternate stacking port. You can configure logical stacking ports to
use any of the following physical stacking port configurations:
• Two native stacking ports
• Two alternate stacking ports
• One native stacking port and one alternate stacking port
When the Stacking Port Selection Control option is enabled in a switch's configuration, you can choose
between native and alternate stacking ports. The default selection is the native stacking ports.
• To select between the native and alternate stacking ports, use the following command for each
switch in the stack:
configure stacking-support stack-port [stack-ports | all] selection
[native { | V160 |V320 | V400} | alternate]
Note
Not all options are available for all switches. Refer to Stacking Considerations for Each
Switch Model on page 196 for details.
• To display the stacking and stacking-support configuration, use the following commands:
show stacking-support
show stacking stack-ports
show stacking {node-address node_address | slot slot_number} detail
Building Stacks
Selecting Native and Alternate Stacking Ports
ExtremeSwitching Hardware Installation Guide 207