Alcatel-Lucent 6648, 6624 manual Redundant Stack Connection, Stacking Cable Redundancy Example

Managing OmniSwitch 6600 Series Stacks Setting Up a Stacked Configuration

Redundant Stack Connection

The figure below shows how the redundant connection (provided by the OS66STK-CBL1M cable) between the top and bottom switches in the stack ensures that data will continue to flow throughout the stack, even in the unlikely event of a connection failure between two switches.

No Connection Failure

In this example, there is a VLAN with an ingress port on switch 1 and an egress port on switch 2.

Data enters switch 1 via a 10/100 Ethernet port, then is passed to switch 2 over the OS66STK-CBL30 stacking cable connection, then exits switch 2 via a 10/100 Ether- net port.

Connection Failure Between Switches 1 and 2

Here, the stacking connection between switches 1 and 2 has gone down unexpectedly. Data can no longer travel directly between switches 1 and 2.

However, because there is a redundant connection (the OS66STK-CBL1M cable between switches 1 and 4), data is passed to switch 4, then quickly traverses switch 3 and exits switch 2 to its destination.

Switch 1

Switch 2

Switch 3

Switch 4

Switch 1

Switch 2

Switch 3

Switch 4

Stacking Cable Redundancy Example

OmniSwitch 6600 Series Hardware Users Guide April 2004 page 3-13