Stacking Requirements; Stacking Limitations - Lenovo CN4093 Application Manual

Stacking Requirements

Stacking Limitations

212
CN4093 Application Guide for N/OS 8.3
Before Lenovo N/OS switches can form a stack, they must meet the following
requirements:
Switches in a hybrid stack must be of the model CN4093 10Gb Converged

Scalable Switch or EN4093R 10Gb Scalable Switch.
 In a hybrid stack, the EN4093R switches cannot act as Backup switches. You
must use only the CN4093 10Gb Converged Scalable switches as the Master
switch and Backup switch.
In a hybrid stack, only two CN4093 10Gb Converged Scalable switches can be

grouped with the EN4093R switches.
Each switch must be installed with N/ OS, version 8.3. Please see

Software in a Stack" on page
 The recommended stacking topology is a bidirectional ring (see
page 221). To achieve this, two 10Gb or two 40 Gb Ethernet ports on each switch
must be reserved for stacking. By default, 10Gb Ethernet ports EXT1 and EXT2
are used.
 Stack with only CN4093 switches supports stack LAG links that can be
configured as follows:
Stack of two units: Maximum of two 10Gb ports or two 40 Gb ports.

Note: Omni ports cannot be used as stack LAG links.
Note: You cannot combine 10Gb ports with 40Gb ports in the stack LAGs.
Note: An LACP port cannot be a stack LAG member. If you need to use the
port in the stack LAG, you must first set the LACP port mode to off
(CN 4093(config-if)# lacp mode off).
 The cables used for connecting the switches in a stack carry low-level,
inter-switch communications as well as cross-stack data traffic critical to shared
switching functions. Always maintain the stability of stack links to avoid
internal stack reconfiguration.
The CN4093 with N/ OS 8.3 can operate in one of two modes:
Default mode, which is the regular stand-alone (or non-stacked) mode.

 Stacking mode, in which multiple physical switches aggregate functions as a
single switching device.
When in stacking mode, the following stand-alone features are not supported:
 Border Gateway Protocol (BGP)
Ethernet Operation, Administration and Maintenance (OAM)

 Internet Group Management Protocol version 3 (IGMPv3)
 Internet Group Management Protocol (IGMP) Querier
 Internet Group Management Protocol (IGMP) Relay
227.
"Upgrading
Figure 25 on