Configuring Perpetual POE

Finding Feature Information

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Perpetual POE

The Perpetual POE provides uninterrupted power to connected PD device even when the PSE switch is booting.


Note
Power to the ports will be interrupted in case of MCU firmware upgrade and ports will be back up immediately after the upgrade.

Fast POE

Fast PoE - This feature remembers the last power drawn from a particular PSE port and switches on power the moment AC power is plugged in (within 15 to 20 seconds of switching on power) without waiting for IOS to boot up. When poe-ha is enabled on a particular port, the switch on a recovery after power failure, provides power to the connected endpoint devices within short duration before even the IOS forwarding starts up.

This feature can be configured by the command poe-ha . If the user replaces the power device connected to a port when the switch is powered off, then this new device will get the power which the previous device was drawing.

Supported Hardware for Perpetual POE, Fast POE and 2-event

Perpetual POE is supported on the following Catalyst 3850 Switch Models:

Switch Model

Cisco IOS Image

Description

WS-C3850-24T-S

IP Base

Cisco Catalyst 3850 Stackable 24 10/100/1000 Ethernet ports, with 350-WAC power supply 1 RU, IP Base feature set

WS-C3850-48T-S

IP Base

Cisco Catalyst 3850 Stackable 48 10/100/1000 Ethernet ports, with 350-WAC power supply 1 RU, IP Base feature set

WS-C3850-24P-S

IP Base

Cisco Catalyst 3850 Stackable 24 10/100/1000 Ethernet PoE+ ports, with 715-WAC power supply 1 RU, IP Base feature set

WS-C3850-48P-S

IP Base

Cisco Catalyst 3850 Stackable 48 10/100/1000 Ethernet PoE+ ports, with 715-WAC power supply 1 RU, IP Base feature set

WS-C3850-48F-S

IP Base

Cisco Catalyst 3850 Stackable 48 10/100/1000 Ethernet PoE+ ports, with 1100-WAC power supply 1 RU, IP Base feature set

WS-C3850-24U-S

IP Base

Stackable 24 10/100/1000 Cisco UPOE ports, 1 network module slot, 1100 W power supply

WS-C3850-48U-S

IP Base

Stackable 48 10/100/1000 Cisco UPOE ports, 1 network module slot, 1100 W power supply

WS-C3850-12S-S

IP Base

Stackable 12 SFP module slots, 1 network module slot, 350-W power supply

WS-C3850-24S-S

IP Base

Stackable 24 SFP module slots, 1 network module slot, 350-W power supply

WS-C3850-12XS-S

IP Base

Catalyst 3850 12-port SFP+ transceiver, 1 network module slot, support for up to 10 G SFP+, 350 W power supply

WS-C3850-16XS-S

IP Base

Catalyst 3850 16-port SFP+ transceiver, 1 network module slot, support for up to 10 G SFP+, 350 W power supply.

16 ports are available when the C3850-NM-4-10G network module is plugged into the WS-C3850-12XS-S switch.

WS-C3850-24XS-S

IP Base

Catalyst 3850 24-port SFP+ transceiver, 1 network module slot, support for up to 10 G SFP+, 715 W power supply.

WS-C3850-32XS-S

IP Base

Catalyst 3850 32-port SFP+ transceiver, 1 network module slot, support for up to 10 G SFP+, 715 W power supply.

32 ports are available when the C3850-NM-8-10G network module is plugged into the WS-C3850-24XS-S switch.

WS-C3850-48XS-S

IP Base

Stackable, with SFP+ transceivers, 48 ports that support up to 10 G, and 4 ports that support up to 40 G. 750 W power supply.

WS-C3850-48XS-F-S

IP Base

Stackable, with SFP+ transceivers, 48 ports that support up to 10 G, and 4 ports that support up to 40 G. 750 W power supply.

WS-C3850-24XU-S

IP Base

Stackable 24 100M/1G/2.5G/5G/10G UPoE ports, 1 network module slot, 1100-W power supply.

WS-C3850-24T-E

IP Services

Cisco Catalyst 3850 Stackable 24 10/100/1000 Ethernet ports, with 350-WAC power supply 1 RU, IP Services feature set

WS-C3850-48T-E

IP Services

Cisco Catalyst 3850 Stackable 48 10/100/1000 Ethernet ports, with 350-WAC power supply 1 RU, IP Services feature set

WS-C3850-24P-E

IP Services

Cisco Catalyst 3850 Stackable 24 10/100/1000 Ethernet PoE+ ports, with 715-WAC power supply 1 RU, IP Services feature set

WS-C3850-48P-E

IP Services

Cisco Catalyst 3850 Stackable 48 10/100/1000 Ethernet PoE+ ports, with 715-WAC power supply 1 RU, IP Services feature set

WS-C3850-48F-E

IP Services

Cisco Catalyst 3850 Stackable 48 10/100/1000 Ethernet PoE+ ports, with 1100-WAC power supply 1 RU, IP Services feature set

WS-3850-24U-E

IP Services

Cisco Catalyst 3850 Stackable 24 10/100/1000 Cisco UPOE ports,1 network module slot, 1100-W power supply

WS-3850-48U-E

IP Services

Cisco Catalyst 3850 Stackable 48 10/100/1000 Cisco UPOE ports,1 network module slot, 1100-W power supply

WS-C3850-12S-E

IP Services

Stackable, 2 SFP module slots, 1 network module slot, 350-W power supply

WS-C3850-24S-E

IP Services

Stackable, 24 SFP module slots, 1 network module slot, 350-W power supply

WS-C3850-12XS-E

IP Services

Catalyst 3850 12-port SFP+ transceiver, 1 network module slot, support for up to 10 G SFP+, 350 -W power supply.

WS-C3850-16XS-E

IP Services

Catalyst 3850 16-port SFP+ transceiver, 1 network module slot, support for up to 10 G SFP+, 350 W power supply.

16 ports are available when the C3850-NM-4-10G network module is plugged into the WS-C3850-12XS-E switch.

WS-C3850-24XS-E

IP Services

Catalyst 3850 24-port SFP+ transceiver, 1 network module slot, support for up to 10 G SFP+, 715 W power supply.

WS-C3850-32XS-E

IP Services

Catalyst 3850 32-port SFP+ transceiver, 1 network module slot, support for up to 10 G SFP+, 715 W power supply.

32 ports are available when the C3850-NM-8-10G network module is plugged into the WS-C3850-24XS-E switch.

WS-C3850-48XS-E

IP Services

Stackable, SFP+ transceivers, 48 ports that support up to 10 G, and 4 ports that support up to 40 G. 750 W power supply.

WS-C3850-48XS-F-E

IP Services

Stackable, SFP+ transceivers, 48 ports that support up to 10 G, and 4 ports that support up to 40 G. 750 W power supply.

WS-C3850-24XU-E

IP Services

Stackable 24 100M/1G/2.5G/5G/10G UPoE ports, 1 network module slot, 1100-W power supply.

Configuring Fast POE

To configure Fast POE, perform the following steps:


Note

You will need to configure the poe-ha command before connecting the PD, or you will need to manually shut/unshut the port after configuring poe-ha .

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. interface interface-id
  4. power inline port poe-ha
  5. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Switch> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Switch# configure terminal

Enters global configuration mode.

Step 3

interface interface-id

Example:

Switch(config)# interface gigabitethernet2/0/1

Specifies the physical port to be configured, and enters interface configuration mode.

Step 4

power inline port poe-ha

Example:


Switch(config-if)# power inline port poe-ha

Configures POE High Availability.

Step 5

end

Example:


Switch(config-if)# end

Returns to privileged EXEC mode.

Example: Configuring Perpetual POE

This example shows how you can configure perpetual POE on the switch. 

Switch> enable
Switch# configure terminal
Switch(config)# interface gigabitethernet2/0/1 
Switch(config-if)# power inline port poe-ha
Switch(config-if)# end