Software Configuration Guide, Cisco IOS XE Everest 16.4.1 (Catalyst 3850 Switches)

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Updated:: December 2, 2016

Chapter: Configuring Perpetual POE

Finding Feature Information
Perpetual POE
Fast POE
Supported Hardware for Perpetual POE, Fast POE and 2-event
Configuring POE
Example: Configuring Perpetual POE

Configuring Perpetual POE

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

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 same command as poe-ha which is already implemented. 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.

Note

Fast POE is supported on Catalyst 3850 only.

Note

In case of UPOE, even though Fast POE is available on the switch side, the PD endpoints may not be able to take advantage of the same, due to the reliance on LLDP to signal the UPOE power availability. This reliance on LLDP requires that the PD endpoint still needs to wait till the IOS comes up and LLDP packet exchanges can happen, signaling the availability of UPOE power.

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 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: Device> `enable`	Enables privileged EXEC mode. Enter your password if prompted.
Step 2	configure terminal Example: Device# `configure terminal`	Enters global configuration mode.
Step 3	interface interface-id Example: Device(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: Device(config-if)# `power inline port poe-ha`	Configures POE High Availability.
Step 5	end Example: Device(config-if)# `end`	Returns to privileged EXEC mode.

Related References

Example: Configuring Perpetual POE

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

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

Related Tasks

Configuring POE

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