IBM 4002-Y2A, Installation And User Manual

Page: 45 / 96

3. Attach the device in the rack as illustrated in Figure 21.
4. If installing only a single switch, proceed to “Powering on the system” on page
22.
5. If installing multiple switches, mount them in the rack, one below the other, in
any order.
Connecting devices in a stack
4002-Y2B and 4002-Y4B devices
Figure 22 on page 20 shows how the stack cables are connected between switches
in a stack. The connection is based on 16/10 Gbps Ethernet, using CX4 cables.
y-series devices support linear and ring stack topologies and can also operate as
standalone devices.
In a linear stack topology there is a single stack cable connection between each
switch that carries two-way communications across the stack. In ring stack
topology, an extra cable is connected between the top and bottom switches forming
a "ring" or "closed-loop." The closed-loop cable provides a redundant path for the
stack link, so if one link fails, stack communications can be maintained. Figure 22
on page 20 illustrates a ring-topology stacking configuration.
You can form a stack containing up to eight y-series units. To connect switches in a
stack, do the following steps:
1.
Plug one end of a stack cable into one of the CX4 stacking ports of the top unit.
2. Plug the other end of the stack cable into one of the stacking ports of the next
unit.
3. Repeat steps 1 and 2 for each unit in the stack. Form a simple chain starting
with a stacking port on the top unit and ending at a stacking port on the
bottom unit (stacking up to eight units).
4. To form a ring stack topology, plug one end of a stack cable into the remaining
stacking port on the bottom unit and the other end into the remaining stacking
port on the top unit.
nety025
Figure 21. Installing the device in a rack
Chapter 2. Installing a y-series switch
19