About Redundancy; Stacking Methods And Summit Switches - Extreme Networks Summit X150 Series Hardware Installation Manual

About Redundancy

When your stack is operational, one switch is the primary (or master) switch that is responsible for
running network protocols and managing the stack. To provide recovery in case of a break in the stack
connections, you can configure redundancy by designating a backup switch to take over as master if the
master switch fails. When you perform the initial software configuration of the stack, the "easy setup"
configuration option automatically configures redundancy, with slot 1 as the master and slot 2 as the
backup. You can also configure additional switches as "master-capable" to become a stack master in
case the initial backup switch fails.
In a stack that combines Summit X460, X480, or X650 series switches with other Summit switch models,
a Summit X460, X480, or X650 series switch might provide more memory and more features than other
Summit switch models in the stack. These differences can affect master node selection, backup node
selection, and failover operation.
NOTE
The master and backup roles should be assigned to switches from the same series. For example, if the
master node is a Summit X480 series switch, the backup node should also be a Summit X480 switch. Similarly, if
the master node is a Summit X650 series switch, the backup node should also be a Summit X650 switch.
The choice of which switches should be the master and backup switches is based on a combination of
the feature scalability of each switch, along with the switch speed. The easy setup configuration process
selects the master and backup switches, based on capability and speed, in the following order:
1 Summit X670 or X480 series
2 Summit X650 series
3 Summit X460 series
4 Summit X450a, X450e, or X250e series
5 Summit X440 series
In comparing two switches in the same capability, the lower slot number takes precedence.
You should follow the same ranking hierarchy when you plan the physical placement of the switches in
the stack.

Stacking Methods and Summit Switches

Each series of Summit switches can use more than one method of stacking.
methods available for each switch series, listed by stacking method.
available for each switch series, listed by the switch series.
Summit Family Switches Hardware Installation Guide
Stacking Methods and Summit Switches
Table 57 shows the stacking
Table 58 shows the stacking method
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