Extreme Networks ExtremeSwitching 5420 Series Installation Manual page 57

Build Stacks
Each switch in the stack is assigned a "slot number" during the initial software
configuration 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
the Switches to Form the Stack Ring
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 configured 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 first eight port LEDs.
Figure 34: Mode Button with STK LED Example
The LED is steady green if the link is OK, blinking green if traffic is present, and off if no
signal is present.
A quick way to verify that the cable connections match the software configuration 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 configured the software. In this case,
reconnect the cables in the correct order and perform the software configuration 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 configure
redundancy by designating a backup switch to take over as primary if the primary
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 primary and slot 2 as the backup. You can also configure additional switches as
on page 69 and configure a vertical stack from
ExtremeSwitching 5420 Series Hardware Installation Guide
Build Basic Stacks
Connect
57