
Extreme Networks Consolidated Hardware Guide 12-5
Switch Components
BlackDiamond Power Supplies
Three types of power supplies are available for the BlackDiamond switches:
• 220 VAC
• 110 VAC
• -48 VDC
All installed power supplies must be of the same type. You cannot mix 110 VAC, 220
VAC, and -48 VDC power supplies in a single chassis.
All BlackDiamond power supplies are hot-swappable. They are also load-sharing. If one
power supply fails in a BlackDiamond 6800 series chassis, the remaining power
supplies will provide sufficient power to operate a chassis that has all slots populated
with modules.
Switch Connectivity and the Backplane
Switch connectivity is an important aspect of the BlackDiamond 6800 series switch. The
MSM64i module is the internal switch fabric for data being sent between I/O modules.
No configuration information is stored on the I/O modules; all configuration
information is stored on the MSM64i module(s). Each MSM64i has two CPUs for
protocol processing and network management. For full redundancy, you can install up
to four MSM64i modules in the BlackDiamond 6816 switch and up to two MSM64i
modules in the BlackDiamond 6808 switch.
The BlackDiamond 6800 series switch has a 100% passive backplane which means the
backplane does not contain any active components that can fail. A passive backplane is
important because it increases the reliability of the switch. The I/O modules treat the
backplane as one logical connection and use the same load sharing (trunking) algorithm
as the front facing ports to distribute the switch traffic. There are multiple Gigabit links
from the I/O modules to the MSM64i modules, and most I/O modules have eight full
duplex Gigabit Ethernet links to the backplane that provide 16 bps full duplex
bandwidth to the backplane. If one of the backplane Gigabit Ethernet links fails,
ExtremeWare reroutes the switch traffic from the failed backplane Gigabit Ethernet link
to another available backplane link. By moving to another available backplane link,
switch connectivity is not disrupted.
With ExtremeWare 6.1 and later, you can configure the backplane load-sharing
algorithm. The default load-sharing algorithm uses ingress port-based trunking. In an
Internet bridging or routing environment, the address-based algorithm may be more
appropriate. For more information about how to configure the backplane load-sharing
algorithm, see the ExtremeWare Software User Guide.
Komentáře k této Příručce