Slot 1
Slot 2
Slot 3
Slot 4
Figure 43: SummitStack Configuration Using Different Switch Models and
SummitStack 40G Cables
Example: Stacked Switches across Two Racks
The following example shows four switches – two of one model, two of another model – physically
located in two adjacent racks.
Each rack has a switch of one model at the top, with a switch of another model below it. The switches
are connected into a stack using SummitStack ports on installed VIM2-SummitStack and VIM1-
SummitStack modules. In this example, start by connecting the top switches together; they will be
designated the stack master and backup nodes (slot 1 and slot 2, respectively).
Figure 44: SummitStack Connections Using Four Switches with SummitStack Ports on
VIMs
lists the recommended order for connecting the stacking ports in this example.
Table 21: Stacked Switches across Two Racks: Connections
Connect this slot and port . . .
. . . To this slot and port
Slot 1
Stack Port 2
Slot 2
Stack Port 1
Slot 2
Stack Port 2
Slot 3
Stack Port 1
Slot 3
Stack Port 2
Slot 4
Stack Port 1
Slot 4
Stack Port 2
Slot 1
Stack Port 1
Example: Stacked Switches across Several Racks
shows five switches installed at the tops of five adjacent racks. To accommodate the shortest
possible cables, immediately adjacent switches are not always connected together. Port 2 on one switch
is connected to Port 1 on the next connected switch. If the easy setup feature is used to configure the
stack parameters, the assigned slot numbers will be as shown in the figure.
Connecting the Switches to Form the Stack Ring
Building Stacks
70
ExtremeSwitching 5420 Series Hardware Installation Guide