Extreme Networks 7720 User Manual

Slot Numbers in Stacks
A switch stack can be thought of as a virtual chassis. Each switch (node) operates as if
it were occupying a slot in a chassis and is controlled by the primary. The high-speed
stacking links function like the backplane links of a chassis.
Each switch in the stack is assigned a “slot number” during the initial software
conguration of the stack. Starting at the switch with the console connection, numbers
are assigned in numerical order following the physical path of the connected stacking
cables. For example, if you follow the cabling recommendations presented in Connect
the Switches to Form the Stack Ring on page 33 and congure a vertical stack from
the console on the switch at the top of the physical stack, the switches will be assigned
slot numbers 1 through 8 from the top down.
A quick way to verify that the cable connections match the software conguration is
to check the stack number indicator on each switch. If the slot numbers do not line
up in the order you arranged the switches, this might indicate that the stacking cable
setup differs from what you intended when you congured the software. In this case,
reconnect the cables in the correct order and perform the software conguration again.
Primary/Backup Switch Redundancy
When your stack is operational, one switch is the primary switch, responsible for
running network protocols and managing the stack.
To provide recovery in case of a break in the stack connections, you can congure
redundancy by designating a backup switch to take over as primary if the primary
switch fails. When you perform the initial software conguration of the stack, the
“easy setup” conguration option automatically congures redundancy, with slot 1 as
the primary and slot 2 as the backup. You can also congure additional switches as
“primary-capable,” meaning they can become a stack primary in case the initial backup
switch fails.
SummitStack Topologies
Figure 4 presents a graphical representation of a stack and some of the terms that
describe stack conditions.
SummitStack Topologies Build Stacks
22 Extreme 7720 Hardware Installation Guide

Extreme Networks 7720 Specifications

General

Jumbo Frame Support	Up to 9216 bytes
Operating Temperature	32°F to 104°F (0°C to 40°C)
Storage Temperature	-40°F to 158°F (-40°C to 70°C)
AC Input Voltage	100-240 VAC
Type	Switch
Power Supply	Dual, hot-swappable power supplies
AC Input Frequency	50/60 Hz