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

Configuring a Stack

Configuration Overview

Best Configuration Practices

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Notes:
 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:
 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.
 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 Figure 24 on
page 211).
 Avoid disrupting the stack connections unnecessarily while the stack is in
operation.
 For enhanced redundancy when creating port trunks, include ports from
different stack members in the trunks.
 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.
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Chapter 14: Stacking