Configuring A Stack; Configuration Overview; Best Configuration Practices - Lenovo CN4093 Application Manual

Configuring a Stack

Configuration Overview

Best Configuration Practices

© Copyright Lenovo 2015
When stacking mode is enabled on the switch, the configuration is reset to factory
default and the port numbering changes.
When a switch mode is changed from stand-alone to stack or from stack to
stand-alone, the active and backup configuration will be erased. We recommended
that you save the configuration to an external device before changing the switch
mode.
This section provides procedures for creating a stack of switches. The high-level
procedure is as follows:
Configure the stack settings to be available after the next reboot:

Choose one Master switch for the entire stack.

Set all stack switches to stacking mode.

Configure the same stacking VLAN for all switches in the stack.

Configure the desired stacking interlinks.

Reboot the stack switches.

 Configure the stack after the reboot:
Bind Member switches to the Master.

Assign a Backup switch.

These tasks are covered in detail in the following sections.
The following are guidelines for building an effective switch stack:
 Always connect the stack switches in a complete ring topology (see
page 221).
 Avoid disrupting the stack connections unnecessarily while the stack is in
operation.
 For enhanced redundancy when creating port LAGs, include ports from
different stack members in the LAGs.
Avoid altering the stack asnum and csnum definitions unnecessarily while the

stack is in operation.
When in stacking mode, the highest QoS priority queue is reserved for internal

stacking requirements. Therefore, only seven priority queues will be available
for regular QoS use.
 Configure only as many QoS levels as necessary. This allows the best use of
packet buffers.
Figure 25 on
219
Chapter 13: Stacking