Extreme Networks 7720 - Power Supply Options; Switch Stacking Capabilities; Secure Boot Process

Fans are ordered separately for base model 7720-32C. Fans are included with other
models.
Power Supplies
Hot swappable 800 W AC or DC power supplies are available to power the switch. The
power supplies have integrated cooling fans that operate independently of the switch
fans. The fans provide either front-to-back or back-to-front airow. The direction of the
airow in the power supplies and the switch fans must be the same. The two power
supply slots on all models are located on the rear panel.
Power supplies are ordered separately for the base model 7720-32C. Power supplies are
included with other models.
For more information about the power supplies used in the 7720 Series switches, see
Power Supplies for Use with Your Switch on page 18.
Stacking
Each 7720 Series switch comes equipped with two 400GbE stacking ports, also referred
to as Universal Ethernet ports. When running SwitchEngine, up to eight systems
can be stacked using qualied QSFP28 direct attach cables and optical transceivers
located on the front panel of the switch. Stacking is not supported when running
Fabric Engine. The stacking ports on 7720-32C models are ports 31 and 32
Note
The two stacking/SFP-DD ports are “Universal Ethernet” ports, labeled “U1” and
“U2.” These ports can operate either as stacking ports with SwitchEngine or
as Ethernet ports with SwitchEngine and with FabricEngine in non-fabric
mode. By default the stacking ports operate as Ethernet ports. Use the enable
stacking-support command to set the stacking ports in stacking mode.
When running FabricEngine, the stacking (or Universal Ethernet) ports are reserved
for use by advanced features on the switch by default. For more information, see
the advanced-feature-bandwidth-reservation Boot Flag documentation in the Fabric
Engine User Guide for your version of the FabricEngine operating system.
Stacking cables are ordered separately.
For information about QSFP28 optical modules, see the Extreme Optics website.
Secure Boot
Secure boot establishes a chain-of-trust relationship in the boot process. The chain-
of-trust is established by cryptographic checks at each stage of the boot process
to validate the integrity and authenticity of the next stage before it can execute.
The current implementation validates boot images. It cannot be disabled after it has
been programmed on the device. There is no command-line interface or commands
to enable or disable secure boot. The status of the boot image verication can be
monitored in the operating system.
Extreme 7720 Series Overview Power Supplies
Extreme 7720 Hardware Installation Guide 13