Installation Guide

The stacking port selection option, which allows you to choose between native and alternate ports, is
enabled by default for X770 switches. For more information, see Selecting Native and Alternate
Stacking Ports on page 275.
Table 143: Stacking Methods for X770 Switches
Stacking Method Speed per Link (HDX) Cable Type and Lengths
SummitStack-V (ports 103 and 104) 10 Gbps 1m and 2m QSFP
+ 4xSFP+ fan-out cable
SummitStack-V160 (ports 103 and 104) 40 Gbps 0.5m, 1m, and 3m (26
AWG) QSFP+
SummitStack-V320 (ports 101 and 103, and 102 and
104)
80 Gbps (combined
over paired ports)
0.5m, 1m, and 3m (26
AWG) QSFP+
Native Stacking for X770 Switches
The X770 supports SummitStack-V80, V160, and V320 stacking. Use any Extreme Networks certified
40G QSFP+ cable or optical transceiver to make the connections among the switches to be stacked.
For X770 native stacking, use the fixed 40G QSFP+ ports numbered 101, 102, 103, and 104 (shown in
Figure 212).
Figure 212: Location of Stacking Ports (101 through 104) on an X770 Switch
For a complete listing of compatible cables and optical transceivers, see the Extreme Optics
Compatibility website.
Alternate Stacking for X770 Switches
Table 144 summarizes alternate stacking support for X770 switches.
Table 144: Alternate Stacking Ports for X770 Switches
Switch Model Type or location of Native
Stacking Ports
Alternate Stacking
Ports
Location of Alternate
Stacking Ports
X770-32q Ports 101,102,103,104 103,104 Front panel
Note
Ports 103 and 104 are not available as data ports when the alternate stacking ports are used.
Ports 101 and 102 remain available to use as data ports.
Stacking Considerations for Each Switch Model Building Stacks
274 Summit Family Hardware Installation Guide