Cisco Catalyst 9300: Настройка постоянного и быстрого PoE (PDF)

Restrictions for Perpetual and Fast PoE

Configuring Perpetual PoE and Fast POE Restrictions for Perpetual and Fast PoE, on page 1 Information About Perpetual PoE, on page 2 Fast POE, on page 2 Configuring Perpetual and Fast PoE, on page 2 Example: Configuring Perpetual and Fast PoE, on page 3 Feature History for Perpetual PoE and Fast PoE, on page 4 Restrictions for Perpetual and Fast PoE The following restrictions apply to perpetual and fast PoE: • Configuration of Fast PoE or Perpetual PoE has to be done before physically connecting any endpoint. Alternatively do a manual shut/no-shut of the ports drawing power.

• Power to the ports will be interrupted in case of MCU firmware upgrade and ports will be back up immediately after the upgrade. • When the switches are power-stacked, perpetual and fast PoE functionalities may not work as expected. This is due to power budget shortage. • The CREE light powered device (PD) may flap at regular intervals if not configured with IP assigned from the DHCP server. • If the PD does not support LLDP user can configure with either static or 2-event to receive required power as per the PD specification. Note Perpetual PoE and Fast PoE are not supported on the following Cisco Catalyst 9300 SKUs: • C9300-24S • C9300-48S Configuring Perpetual PoE and Fast POE 1

Стр. 1

Configuring Perpetual and Fast PoE

Information About Perpetual PoE Perpetual PoE provides uninterrupted power to connected powered device even when a power sourcing equipment (PSE) switch is starting after a reload from executing the Cisco IOS software reload command. Power to the ports will be interrupted in case of M3 or PSE firmware upgrade, and power to the ports will be backed up after Cisco IOS software starts. Caution 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. 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. Configuring Perpetual and Fast PoE To configure perpetual and Fast PoE, perform the following steps.

Before you begin Configure the perpetual-poe-ha command before connecting the powered device, or manually shut or unshut the port after configuring poe-ha command. Procedure Configuring Perpetual PoE and Fast POE Information About Perpetual PoE 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. Configuring Perpetual PoE and Fast POE 2

Стр. 2

Example: Configuring Perpetual and Fast PoE

Example: Configuring Perpetual and Fast PoE This example shows how you can configure perpetual PoE on a switch: Device> enable Device# configure terminal Device(config)# interface gigabitethernet2/0/1 Device(config-if)# power inline port perpetual-poe-ha Device(config-if)# end This example shows how you can configure fast PoE on the switch: Device> enable Device# configure terminal Device(config)# interface gigabitethernet2/0/1 Device(config-if)# power inline port perpetual-poe-ha Device(config-if)# power inline port poe-ha Device(config-if)# end This example shows what happens if you configure fast PoE before configuring perpetual PoE:

Device> enable Device# configure terminal Configuring Perpetual PoE and Fast POE Example: Configuring Perpetual and Fast PoE Command or Action Purpose Step 3 interface interface-id Example: Device(config)# interface gigabitethernet 2/0/1 Specifies the physical port to be configured, and enters interface configuration mode. Step 4 power inline port perpetual-poe-ha Example: Device(config-if)# power inline port perpetual-poe-ha Configures perpetual PoE. When you configure perpetual PoE on a port connected to a powered device, the powered device remains powered on during reload. Step 5 power inline port poe-ha Example: Device(config-if)# power inline port poe-ha Configures Fast PoE.

When you configure Fast PoE, if the switch is power cycled, PD device is powered on within 10-15 seconds of plugging into a power source without waiting for IOS to boot up. Note You should configure perpetual PoE using power inline port perpetual-poe-ha command before configuring Fast PoE using power inline port poe-ha command. Step 6 end Example: Device(config-if)# end Returns to privileged EXEC mode. Configuring Perpetual PoE and Fast POE 3

Стр. 3

Feature History for Perpetual PoE and Fast PoE

Device(config)# interface gigabitethernet2/0/1 Device(config-if)# power inline port poe-ha Interface Gi2/0/1:INFO: Please execute "power inline port perpetual-poe-ha" configuration command when "power inline port poe-ha" is configured on the interface to enable fast poe Device(config-if)# power inline port perpetual-poe-ha Device(config-if)# end This example shows what happens when you disable perpetual PoE without disabling fast PoE on the interface: Device> enable Device# configure terminal Device(config)# interface gigabitethernet2/0/1 Device(config-if)# power inline port poe-ha Interface Gi2/0/1:INFO:

Please execute "power inline port perpetual-poe-ha" configuration command when "power inline port poe-ha" is configured on the interface to enable fast poe Device(config-if)# power inline port perpetual-poe-ha Device(config-if)# no power inline port poe-ha Device(config-if)# power inline port poe-ha Device(config-if)# no power inline port perpetual-poe-ha Interface Gi2/0/1:INFO:

Please execute "no power inline port poe-ha" configuration command, as fast poe has no effect without "power inline port perpetual-poe-ha" configuration on the interface Device(config-if)# end Feature History for Perpetual PoE and Fast PoE This table provides release and related information for the features explained in this module. These features are available in all the releases subsequent to the one they were introduced in, unless noted otherwise. Table 1: Feature History for Perpetual PoE and Fast PoE Use the Cisco Feature Navigator to find information about platform and software image support. To access Cisco Feature Navigator, go to Cisco Feature Navigator .

Configuring Perpetual PoE and Fast POE Feature History for Perpetual PoE and Fast PoE Releases Feature Feature Information Cisco IOS XE Everest 16.5.1a Perpetual and Fast PoE Perpetual PoE provides uninterrupted power to a connected powered device even when the PSE switch is booting. Fast PoE remembers the last power drawn from a particular PSE port and switches on power without waiting for IOS to boot up. Configuring Perpetual PoE and Fast POE 4

Стр. 4