Stack Cabling - Alcatel-Lucent OmniSwitch 6250-M Hardware User's Manual

Managing OmniSwitch 6250 Series Stacks

Stack Cabling

Switches in a stack are connected to each other by stacking cables. These stacking cables provide high-
speed, dual-redundant links between switches in a stack.
Stacking cables for OmniSwitch 6250 Series switches must be connected in an A-B pattern. In other
words, the cable connected to stacking port A of one switch must be connected to stacking port B of the
adjacent switch. In addition, for a stack to have effective redundancy, a redundant stacking cable must be
installed between the upper-most and bottom-most switch at all times. This provides effective failover in
the event of a sta cking link or module failure within the stack.
The diagram below shows the required stacking cable pattern. For detailed information on assembling a
stack and connecting the cables, refer to
Components."
Note. When planning the stack cabling configuration, keep in mind that the switch connected to stacking
port A of the primary switch will be assigned the secondary management role by default.
Example of Stacking Cable Pattern (Chassis Rear Panels Shown)
OmniSwitch 6250 Series Hardware Users Guide
Preliminary
9/28/09
Chapter 2, "OmniSwitch 6250 Series Chassis and Hardware
A B
A stack of eight switches in a crossed (stacking port
A to stacking port B) configuration. Note that a
redundant stacking cable connection exists between
the top and bottom switches. This connection is
required for effective redundancy across the stack.
September 2009
Stack Cabling
page 6-17