Table 77: SummitStack Methods (continued)
Stacking Method Speed per
Link (HDX)
Cable Type and Lengths Switch Models
SummitStack-
V400
106 Gbps 0.5 m - 20 m
QSFP28 only
X590 (ports 61, 69)
X690 (ports 61, 69)
X695 (ports 61, 62)
X870 (ports 121, 125)
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
X590 (ports 61, 69)
X690 (ports 61, 69)
X695 (ports 61, 62)
X870 (ports 121, 125)
For more details about the stacking methods that are available for each switch series, see the topics
listed in Stacking Considerations for Each Switch Model on page 195.
Note
Because all switches in the stack must run the same version of ExtremeXOS, it is not possible
to stack switches that require ExtremeXOS version 21, for example the X440-G2 and the
X620, with switches that are incompatible with ExtremeXOS version 21, for example the X440
and the X460.
SummitStack Terms
Table 78 describes the terms used for the SummitStack feature. These terms are listed in the
recommended reading sequence.
Table 78: List of Stacking Terms
Term Description
Stackable switch An ExtremeSwitching switch that provides two stacking ports and can
participate in a stack.
Stacking port A physical interface of a stackable switch that is used to allow the
connection of a stacking link. Stacking ports are point-to-point links that
are dedicated for the purpose of forming a stack.
Native stacking A stacking configuration in which stack members are connected using
either designated Ethernet data ports or dedicated stacking connectors.
Building Stacks SummitStack Terms
ExtremeSwitching Hardware Installation Guide 189
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