Cisco WS-C2950G-48-EI Software Guide - Page 423
Redundant Mode Guidelines, Combined Mode Guidelines
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Chapter 28 Power Management Understanding How Power Management Works on the Catalyst 4500 Series Switches Redundant Mode Guidelines This section describes the guidelines for using redundant mode in the Catalyst 4500 series switches: • By default, the power supplies in a Catalyst 4500 series switch are set to redundant mode. • The two power supplies must be the same type. Caution Do not use the 1400 W DC power supply with any other power supply, even for a hot swap or other short-term emergency, because you can seriously damage your switch. • If you set your switch to redundant mode and only one power supply is installed, your switch accepts the configuration but operates without redundancy. Note If you use power supplies with different types or wattages in your switch, the switch uses the power supply in power supply bay 1 (PS1) and ignores the power supply in power supply bay (PS2). Your switch will not have power redundancy. • When using fixed power supplies, choose a power supply that can support the switch configuration. • When using variable power supplies, choose a power supply that supplies enough power so that the chassis and inline power requirements are less than the maximum available power for the chassis and inline power for the power supply. Variable power supplies automatically adjust the power resources to accommodate the chassis and inline power requirements when a system boots. Modules are brought up first, followed by powered devices. • See Table 28-1 on page 28-4 for a list of the maximum available power for chassis and inline power for each power supply. Combined Mode Guidelines This section describes the guidelines for using combined mode in the Catalyst 4500 series switches: • The two power supplies must be the same type. • If you use power supplies with different types or wattages, the switch uses only one power supply. Your switch will have no power redundancy. • The 1400 W DC power supply does not support combined mode. If you set the power budget to 2, the switch ignores this setting. For more information about the 1400 W DC power supply, see the "1400 W DC Power Supply Guidelines and Restrictions" section on page 28-5. • When you set your switch to combined mode and only one power supply is installed, your switch continues to operate in combined mode. • When using variable power supplies, choose a power supply that supplies enough power so that the chassis and inline power requirements are less than the maximum available power for the chassis and inline power for the power supply. Variable power supplies automatically adjust the power resources to accommodate the chassis and inline power requirements. • When your switch is set to combined mode, the total available power is not the mathematical sum of the individual power supplies. The power supplies have a predetermined current sharing ratio. The total power available is P + (P * ratio). • See Table 28-1 on page 28-4 for a list of the maximum available power for chassis and inline power for each power supply. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 28-3