Dell PowerConnect J-8216 Software Guide for JUNOS version 10.3 - Page 374

Dell PowerConnect J-Series Ethernet Switch Complete Software Guide for Junos OS • J-EX4200 Switches Hardware Overview on page 25 • J-EX8208 Switch Hardware Overview on page 27 • J-EX8216 Switch Hardware Overview on page 30 Power Management • Understanding Power Management on J-EX Series Switches on page 302 Understanding Power Management on J-EX Series Switches The power management feature for Dell PowerConnect J-Series J-EX8200 Ethernet Switches helps ensure that normal operation of the system is not disrupted because of insufficient power to the switch. It does so by employing a power budget policy. Power management does the following in its power budget policy: • Budgets power for each switch component that requires power. The amount that power management budgets for each component is the maximum power that component might consume. For example, for the fan tray, power management budgets the amount of power required to run the fans at their maximum speed setting. • Reserves a set amount of power for power supply redundancy. In its default configuration, power management manages the switch for N+1 power redundancy, which ensures uninterrupted system operation if one power supply fails. For example, if a switch has four online 3000 W power supplies, power management reserves 3000 W in its power budget policy for redundancy. It allocates the remaining 9000 W to normal operating power. • Specifies the rules under which components receive power. These rules are designed to ensure the least disruption to switch operation under conditions of insufficient power. For example, power management provides power to core system components, such as the Routing Engine, before it provides power to line cards. You can configure certain aspects of power management's budget policy, specifically: • The power priority of individual line cards. By assigning different power priorities to the line cards, you can determine which line cards are more likely to receive power in the event of insufficient power. • The power redundancy configuration. The default power redundancy configuration is N+1; you can optionally configure N+N. For example, if you have deployed two independent AC power feeds to the switch, configure N+N redundancy. When you configure power management for N+N redundancy, it reserves the appropriate amount of power in its power budget and reports insufficient power conditions accordingly. These configurable items are discussed further in: • Power Priority of Line Cards on page 303 • Power Supply Redundancy on page 304 302