Redundant Stacking Cable Connection - Alcatel-Lucent OmniSwitch 6850 Series Hardware User's Manual

Managing OmniSwitch 6850 Series Stacks

Redundant Stacking Cable Connection

OmniSwitch 6850 Series switches allow redundant stacking cable connections between the top-most and
bottom-most switches in a stack.
Important. For a stacked configuration to have effective redundancy, a redundant stacking cable must be
installed between the upper-most and bottom-most switch in the chassis at all times.
The figure below shows how the redundant connection between the top and bottom switches in the stack
ensures that data will continue to flow throughout the stack, even in the event of a connection failure at
one of the stacking cables.
Stacking Cables
Stacking Cable Redundancy: Recovery Following a Stacking Link Failure
OmniSwitch 6850 Series Hardware Users Guide
Chassis Front
1
Slot 1
Slot 2
Slot 3
Slot 4
2
Slot 1
Slot 2
Slot 3
Slot 4
August 2007
Data enters slot 1 via a 10/100/1000 Ethernet port. The
data is passed to slot 2 over the stacking cable connection,
then exits slot 2 via one of its 10/100/1000 Ethernet.
The stacking connection between slots 1 and 2 goes
down unexpectedly. Data can no longer travel directly
between slot 1 and 2.
However, because there is a redundant connection (the
cable between slot 1 and slot 4), data is immediately
passed to slot 4, then quickly traverses slot 3 and exits
slot 2 to its destination.
Stack Cabling
page 4-17