Chapter 13. Stacking; Stacking Overview - Lenovo CN4093 Application Manual

Chapter 13. Stacking

Stacking Overview

© Copyright Lenovo 2015
This chapter describes how to implement the stacking feature in the Lenovo Flex
System CN4093 10Gb Converged Scalable Switch. The following concepts are
covered:
 "Stacking Overview" on page 211
 "Stack Membership" on page 214
 "Configuring a Stack" on page 219
 "Managing a Stack" on page 225
 "Upgrading Software in a Stack" on page 227
 "Replacing or Removing Stacked Switches" on page 228
 "ISCLI Stacking Commands" on page 237
A hybrid stack is a group of eight switches: two CN4093 10Gb Converged Scalable
Switches and six EN4093R 10Gb Scalable Switches. A stack can also be formed with
just two CN4093 10Gb Converged Scalable Switches.
A stack has the following properties, regardless of the number of switches
included:
 The network views the stack as a single entity.
 The stack can be accessed and managed as a whole using standard switch IP
interfaces configured with IPv4 addresses.
 The CLI for Individual Member switches is available via the Master switch serial
console or using remote Telnet/SSH access to the Master.
Once the stacking links have been established (see the next section), the number

of ports available in a stack equals the total number of remaining ports of all the
switches that are part of the stack.
 The number of available IP interfaces, VLANs, LAGs, LAG Links and other
switch attributes are not aggregated among the switches in a stack. The totals for
the stack as a whole are the same as for any single switch configured in
stand-alone mode. A maximum of 4095 VLANs are supported in stand-alone
mode, and a maximum of 1024 VLANs are supported in stacking mode.
211