Extreme Networks ExtremeSwitching 5420 Series Installation Guide

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 69 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.
The top half of the number blinks if the switch is the primary, and the bottom half
blinks if it is the backup. If the LED is steadily lit, the switch is a standby. If the LED is off
the switch is not congured as a member of a stack.
The Mode button is used to cycle through three display modes for the port LEDs.
After two presses of the Mode button, the port LEDs will enter the STK Display Mode,
indicated by the STK LED. STK mode is used to indicate slot presence and slot number
via the rst eight port LEDs.
Figure 34: Mode Button with STK LED Example
The LED is steady green if the link is OK, blinking green if trafc is present, and off if no
signal is present.
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
Build Stacks Build Basic Stacks
ExtremeSwitching 5420 Series Hardware Installation Guide 57

Extreme Networks ExtremeSwitching 5420 Series Specifications

General

Brand	Extreme Networks
Model	ExtremeSwitching 5420 Series
Category	Switch
Language	English