Installation Guide

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If the MPLS feature pack is installed on the master-capable nodes, the following guidelines apply:
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Enhanced stacking must be configured on each switch in the stack. (In ExtremeXOS version 22.2
and later, enhanced stacking is configured automatically.)
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We recommend against mixing X450-G2, X460-G2, X670-G2, and X770 switches in a stack if the
desired routing table exceeds the supported limit. For the X770 switch, the limit is 98K IPv4 LPM
routes.
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X770 switches support multiple types of QSFP+ stacking cables for connection between ports
101-104 and other Summit switches. For information on which cables to use with each type of switch,
see Selecting Stacking Cables on page 166.
X870 Stacking
X870 series switches support native stacking using front-panel data ports 121 and 125. They can be
stacked with other X870 switches, with X590 switches, and with X690 switches. Alternate stacking is
not supported.
The stacking-support option is disabled by default for all X870 switches. For more information, see
Enabling and Disabling the Stacking-Support Option on page 149.
Table 76 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 76: Stacking Methods for X870 Switches
Stacking Method Speed per Link (HDX) Cable Type and Lengths
SummitStack-V400 (Front panel ports 121,125) 106 Gbps 0.5 m – 5.0 m
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 151), 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:
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Two native stacking ports
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Two alternate stacking ports
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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.
Building Stacks
ExtremeSwitching and Summit Switches: Hardware Installation Guide 162