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Configuration Guide - Device Management

S7700 and S9700 V200R013C00

This document describes the configurations of Device Management, including device status query, hardware management, CSS, SVF, PoE, OPS, OIDS, energy-saving management, information center, fault management, NTP, synchronous ethernet, PTP.
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Configuring the Power Supply Redundancy Mode

Configuring the Power Supply Redundancy Mode

Context

When power modules of a switch do not work in redundancy mode, the system power is affected if power modules are removed or faulty. As a result, some components (such as boards) may not work properly. To improve the reliability of the power supply system, switches support multiple power supply redundancy modes.
  • An S7703 PoE switch has three power modules and supports two power supply redundancy modes: N+1 redundancy and N+0 (no redundancy).
  • An S7706 PoE switch has eight power modules and supports three power supply redundancy modes: N+N redundancy, N+1 redundancy, and N+0 (no redundancy).
Power modules are classified into the following roles:
  • Active power module (M): When the power supply redundancy mode is N+1 or N+N, N power modules are active.
  • Standby power supply (S): When the power supply redundancy mode is N+1 or N+N, one or N power modules work in standby mode.
  • Power modules that are always supplying power: All power modules except the active and standby power modules are always supplying power. For example: When the power supply redundancy mode is N+0 (no redundancy), N power modules are always supplying power. When an S7706 PoE switch has six installed power modules and the power supply redundancy mode is 3+1 redundancy, two power modules excluding three active power modules and one standby power module are always supplying power.

In N+1 redundancy, the system uses one power module with the maximum rated power among N+1 power modules as the standby power module. In N+N redundancy, the system uses N power modules providing larger power among the first N and last N power modules as standby power modules. After the power supply redundancy mode is configured, run the display power command to view the power module roles.

When the power supply redundancy mode is configured manually, the configured maximum output power must be larger than or equal to the maximum power required by the device. The maximum system output power is the sum of the maximum power of both active power modules and power modules that are always supplying power. To view the maximum power required by the switch and boards' rated power, run the display power system command.

When two power supply systems are in use, N+N redundancy is recommended. When a single power supply system is in use, N+1 redundancy is recommended. N+0 (no redundancy) maximizes the power but results in low reliability. You need to select the appropriate power supply redundancy mode based on the number of available power modules and the rated power.

Generally, power supply is evenly shared by all power modules to reduce the load of a single power module and improve system reliability. When the system power consumption is less than 50% power of a single power module, standby power modules do not work.

Table 2-5  Power supply redundancy modes

Power Supply Redundancy Mode

Power Supply Redundancy Modes Applicable to S7703 PoE

Power Supply Redundancy Modes Applicable to S7706 PoE

N+N

-

1+1, 2+2, 3+3, 4+4

N+1

1+1, 2+1

2+1, 3+1, 4+1, 5+1, 6+1, 7+1

N+0

1+0, 2+0, 3+0

1+0, 2+0, 3+0, 4+0, 5+0, 6+0, 7+0, 8+0

For details about the power supply redundancy modes of S7703 PoE and S7706 PoE switches, see "Power Supply Slot Configuration" in Hardware Description.

Procedure

  1. (Optional) Ensure that the maximum output power in power supply redundancy mode is larger than or equal to the maximum power required by the device.

    Run display power system

    The maximum power required by the device and boards' rated power are displayed.

    Run display power

    The power module roles are displayed. Based on the roles and boards' rated power, calculate the maximum power sum of the active power module and power modules that are always supplying power, that is, calculate the maximum output power in power supply redundancy mode.

  2. Run system-view

    The system view is displayed.

  3. Configure the power supply redundancy mode of the switch.

    If the switch is an S7703 PoE switch, run set power backup-mode { n+1 base baseN | none }

    The power supply redundancy mode is configured.

    If the switch is an S7706 PoE switch, run set power backup-mode [ chassis chassis-id ] { { n+1 | n+n } base baseN | none }

    The power supply redundancy mode is configured.

    By default, the power supply redundancy mode is automatic redundancy. That is, the power module roles are automatically determined based on the power and number of power modules.

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Updated: 2019-04-20

Document ID: EDOC1100065738

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