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Summit Family Switches Hardware Installation Guide
101
Switches from some Summit series have more memory than other Summit models and support
additional features. If the stack combines switches from different Summit series, follow these additional
guidelines:
● To support the additional capabilities in a stack that includes multiple Summit switch series, the
most capable switches should be the master and backup nodes.
● If a Summit X480 series switch is the stack master, the backup node should also be a Summit X480
series switch.
● If a Summit X650 series switch is the stack master, the backup node should also be a Summit X650
series switch.
● If Summit X480 series and X650 series switches are both present in the stack, the master and backup
nodes should both be Summit X480 series switches.
Connecting the Switches to Form the Stack Ring
After you have installed the individual Summit switches (see Chapter 5), connect the switches together
using the stacking cables. The examples in this section show cable connections and the recommended
order for connecting ports to facilitate the easy setup configuration.
In general, it is best to connect Stack Port 2 on one switch to Stack Port 1 on the switch with the next
higher slot number. Although you can connect the switches in any order, connecting them as shown in
these examples will produce better predictability and easier software configuration. It is essential to
create an unbroken data path through all the switches in the stack.
NOTE
The connection recommendations in this section do not apply to Summit X650 series switches with installed
VIM1-SummitStack512 modules. For information about connecting the ports on the VIM1-SummitStack512
modules, see “Using the VIM1-SummitStack512 Module” on page 107.
For instructions to connect specific types of stacking cables, see “Connecting Stacking Cables” on
page 108.
Using SummitStack Ports and 40G Stacking Cables
SummitStack ports are integrated into the back panel of the Summit X250e, X450, X450a, and X450e
series switches. In addition, the X480 series switches and X650 switches accommodate VIMs that
provide SummitStack ports.
The examples in this section show physical stacking arrangements that include all switches in a single
rack, switches in two adjacent racks, and switches at the tops of several racks in a row.
Single-Rack Stacking Configurations
These examples show stacks of either four or eight switches in a single rack. The slot numbers presume
a console connection to the switch at the top of the physical stack.
Figure 70 shows cable connections for a 4-node stack using SummitStack 40G cables to connect switches
with integrated SummitStack ports.