Installation Guide

upgrade licensing is not required to enable stacking on the designated stack ports. Table 122
summarizes alternate stacking support for the various X440-G2 switch models.
Table 122: Alternate Stacking Ports for X440-G2 Switches
Switch Model Type or location of Native
Stacking Ports
Alternate Stacking
Ports
Location of Alternate
Stacking Ports
X440-G2-12t-10GE4
X440-G2-12p-10GE4
Fixed (front panel) 15,16 Front panel
X440-G2-24t-10GE4
X440-G2-24p-10GE4
X440-G2-24x-10GE4
X440-G2-24t-10GE4-DC
Fixed (rear panel) 27,28 Rear panel
X440-G2-48t-10GE4
X440-G2-48p-10GE4
X440-G2-48t-10GE4-DC
Fixed
(rear panel, dedicated SFP+ port)
49,50 Rear panel
X450-G2 Stacking
The stacking-support option is enabled by default for X450-G2 switches. For more information, see
Enabling and Disabling the Stacking-Support Option on page 252.
The stacking port selection option, which allows you to choose between native and alternate ports, is
enabled by default for X450-G2 switches. For more information, see Selecting Native and Alternate
Stacking Ports on page 275.
Table 123: Stacking Methods for X450-G2 Switches
Stacking Method Speed per Link (HDX) Cable Type and Lengths
SummitStack-V84
Uses rear panel dedicated 21 Gb stacking
ports
Available only in stacks of X450-G2 switches
running the same version of ExtremeXOS
21 Gbps 0.5m, 1.0m, 3.0m. 5.0m
QSFP+ passive copper cable
SummitStack-V
(Front panel 10G models)
10 Gbps 0.5m–40km
SFP+
Native Stacking for X450-G2 Switches
For native stacking with the X450-G2 switch, use the two fixed 21 Gb QSFP+ stacking ports on the rear
of the switch, as shown in Figure 206. These stacking ports provide SummitStack-V84 stacking and can
be stacked natively only with other X450-G2 switches.
SummitStack-V84 connections require direct-connect QSFP+ copper cables.
The X450-G2 is the only Extreme Networks switch that supports SummitStack-V84.
Stacking Considerations for Each Switch Model
Building Stacks
258 Summit Family Hardware Installation Guide