Install Guide

Figure 123. Supported Stacking Topologies
High Availability on Stacks
Stacks have master and standby management units analogous to Dell EMC Networking route processor modules (RPM).
The master unit synchronizes the running configuration and protocol states so that the system fails over in the event of a
hardware or software fault on the master unit. In such an event, or when the master unit is removed, the standby unit becomes
the stack manager and Dell EMC Networking OS elects a new standby unit. Dell EMC Networking OS resets the failed master
unit: after online, it becomes a member unit; the remaining members remain online.
Example of Stack Manager Redundancy
Management Access on Stacks
You can access the stack via the console port or VTY line.
● Console access — You may access the stack through the console port of the master unit (stack manager) only. Similar
to a standby RPM, the console port of the standby unit does not provide management capability; only a limited number of
commands are available. Member units provide a limited set of commands.
● Remote access — You may access the master unit and standby unit in a stack through the dedicated management
Ethernet interfaces with SNMP, SSH, or via Telnet.
Example of Accessing Non-Master Units on a Stack via the Console Port
-----------------CONSOLE ACCESS ON A STANDBY----------------------------
Dell(standby)#?
cd Change current directory
clear Reset functions
copy Copy from one file to another
delete Delete a file
dir List files on a filesystem
disable Turn off privileged commands
enable Turn on privileged commands
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Stacking