Install Guide

NOTE: If the removed management unit is brought up as a standalone unit or as part of a different stack, there is a
possibility of MAC address collisions.
A standalone is added to a stack. The standalone and the master unit have the same priority, but the standalone has a lower
MAC address, so the standalone reboots. In the second example, a standalone is added to a stack. The standalone has a higher
priority than the stack, so the stack (excluding the new unit) reloads.
Example of Adding a Standalone with a Lower MAC Address to a Stack
Example of Adding a Standalone with a Lower MAC Address and Equal Priority to a Stack
Stacking LAG
When multiple links are used between stack units, Dell EMC Networking OS automatically bundles them in a stacking LAG to
provide aggregated throughput and redundancy.
The stacking LAG is established automatically and transparently by Dell EMC Networking OS (without user configuration) after
peering is detected and behaves as follows:
● The stacking LAG dynamically aggregates; it can lose link members or gain new links.
● Shortest path selection inside the stack: If multiple paths exist between two units in the stack, the shortest path is used.
Supported Stacking Topologies
The device supports stacking in a ring or a daisy chain topology.
Dell EMC Networking recommends the ring topology when stacking the switches to provide redundant connectivity.
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
exit Exit from the EXEC
format Format a filesystem
fsck Filesystem check utility
pwd Display current working directory
rename Rename a file
Stacking
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