HP ProCurve Switch 2626-PWR Configuration guide

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Manual Supplement:
Power Over Ethernet (PoE) Operation
for the HP ProCurve Switch 2626 and Switch 2650
This supplement describes Power over Ethernet (PoE) configuration, operation, and monitoring on
these HP ProCurveswitches:
■HP ProCurve Switch2626-PWR (J8164A)
■HP ProCurve Switch2650-PWR (J8165A)
Related HP ProCurve Switch 2600-PWR Series publications include:
■HP ProCurve Switch 2600 and 2600-PWR Series Installation and Getting Started Guide
■HP ProCurve Switch 2600-PWR Series Planning and Implementation Guide
■ Release Notes: Version H.07.XX for the HP ProCurve Swtich 2600 Series and the Switch
6108
■ Management and Configuration Guide for the HP ProCurve Switch 2600 Series, Switch
2800 Series, Switch 4100 Series, and the Switch 6108
■ Access Security Guide for the HP ProCurve Switch 2600 Series, Switch 2800 Series, Switch
4100 Series, and the Switch 6108
Note
For important installation information regarding your Switch 2626-PWR or Switch 2650-PWR, refer
to the HP ProCurve Switch 2600 and 2600-PWR Series Installation and Getting Started Guide
printed and shipped with your HP ProCurve switch. (A copy of the installation guide is also included
on the Documentation CD-ROMshipped with the switch.)
Also, HP periodically updates switch software and product manuals, and posts them on the world
wide web. For the latest software release and publications for yourHP networking product, visit
http://www.hp.com/go/hpprocurve.Click on software updates to check onthe latest software releases.
Click on technical support, then product manuals to check on the latest publications.

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© Copyright 2001, 2003 Hewlett-Packard Company, LP.
The information contained herein is subject to change
without notice.
Publication Number
5990-6044
October 2003
Edition 1
Applicable Product
HP ProCurve Switch 2626-PWR (J8164A)
HP ProCurve Switch 2650-PWR (J8165A)
Trademark Credits
Microsoft®, Windows®, and Windows NT® are US
registered trademarks of Microsoft Corporation.
Adobe® and Acrobat® are trademarks of Adobe Systems
Incorporated.
Hewlett-Packard Company
8000 Foothills Boulevard, m/s 5551
Roseville, California 95747-5551
http://www.hp.com/go/hpprocurve
Disclaimer
The information contained inthis document is subject to
change without notice.
HEWLETT-PACKARD COMPANY MAKES NO WARRANTY
OF ANY KIND WITH REGARD TO THIS MATERIAL,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS
FORA PARTICULAR PURPOSE. Hewlett-Packard shall not
be liable for errors contained herein or for incidental or
consequential damages in connection with the furnishing,
performance, or use of this material.
The only warrantiesfor HP products and services are set
forth in the express warranty statements accompanying
such products and services. Nothing herein should be
construed as constituting an additional warranty. HP shall
not be liable for technical or editorial errorsor omissions
contained herein.
Hewlett-Packard assumes no responsibility for the use or
reliability of its software on equipment that is not furnished
by Hewlett-Packard.
Warranty
See the Customer Support/Warranty booklet included with
the product.
A copy of the specific warranty terms applicable to your
Hewlett-Packard products and replacement parts can be
obtained from your HP Sales and Service Office or
authorized dealer.
ii

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Contents
Contents
Applicable Switch Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
General Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Related Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
General PoE Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
PD Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Power Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
When Does the Switch Prioritize Power Allocations? . . . . . . . . . . . 5
How Does the Switch Prioritize Power Allocations? . . . . . . . . . . . . 6
Configuring PoE Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Viewing PoE Configuration and Status . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Displaying the Switch’s Global PoE Power Status . . . . . . . . . . . . . . . . . 9
Displaying an Overview of PoE Status on All Ports . . . . . . . . . . . . . . . 10
Displaying the PoE Statuson Specific Ports . . . . . . . . . . . . . . . . . . . . . 11
Planning and Implementing a PoE Configuration . . . . . . . . . . . . . . . . 12
Assigning PoE Ports to VLANs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
ApplyingSecurity Features to PoE Configurations . . . . . . . . . . . . . . . 12
Assigning Port-Based Priority to Incoming Packets . . . . . . . . . . . . . . . 13
PoE Event Log Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Downloading Switch Documentation and Software from
the Web . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
To Download a Software Version: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
To Download Product Documentation: . . . . . . . . . . . . . . . . . . . . . . . . . 16
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Applicable Switch Models
Applicable Switch Models
The Power Over Ethernet (PoE) feature described inthissupplement operates
on these switches:
■ HP ProCurveSwitch 2626-PWR (J8164A)
■ HP ProCurveSwitch 2650-PWR (J8165A)
Introduction
PoE technology allows IP telephones,wireless LAN access points, and other
appliances to receive power and transfer data over existing LAN cabling.
General Operation
The Switch 2626-PWR and 2650--PWR provision their 10/100Base-TX ports
with 406 watts of power for PoE applications compatible with the IEEE
802.3af standard. On the Switch 2650-PWR, you can optionally provision ports
1-24 with 406 watts of internal power and ports 25-48 with 368 watts of external
power by adding an HP ProCurve 600 Redundant and External Power Supply
(HP RPS/EPS; J8168A).
Note� The switches support the normal operation of non-PoE devices on ports
configured for PoE operation.
Regarding Cat-5 cabling for PoE, the 802.af standard allows either the spare
pair or the data pair for PoE power transmission. The Switch 2600-PWR series
devices supply PoE power over the data pair.
Using the commands described in this chapter,you can:
■ Configure a power threshold for SNMP and Event Log reporting of
PoE consumption on the switch.
■ Specify the priority you want the switch to use for provisioning PoE
in the event that the switch’sPoE resources become oversubscribed.
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Terminology
■ Enable or disable PoE operation on individual ports. (In the default
configuration, the switch enables PoE on all 10/100-TX ports, subject
to PoE priorityin the case of oversubscription of PoE resources.)
■ Monitor PoE status and performance on the switch
Related Publications
This supplement introduces general PoE operation, PoE configuration and
monitoring commands, and Event Log messages related to PoE operation on
the HPProCurve Switch 2626-PWR and 2650-PWR devices. The following two
manuals provide further information:
■ For information on installing the HP ProCurveSwitch 2626-PWR and
2650-PWR, refer to the Installation and Reference Guide provided
with the switch.
■ To helpyou plan and implement a PoE system in your network, refer
to the Planningand Implementation Guide for the Switch2600-PWR
series, which is available from either of the following sources:
• The Documentation CD-ROM (version 3.5 or greater) shipped with
your Switch Series 2600-PWR device
• The HP ProCurve website at http://www.hp.com/go/hpprocurve. (Click
on technical support, then product manuals.)
Terminology
Term Use in this Manual
active PoE port A PoE-enabled port connected to a PD requesting power.
priority class Refers to the type of power prioritization where the switch uses Low (the
default), High, and Critical priority assignments to determine which
groups of ports will receive power. Note that power priority rules apply
only if PoE provisioning on the switchbecomes oversubscribed.
EPS External Power Supply; for example, an HP 600 RPS/EPS.An EPS device
provides power to provision PoE ports on a switch. See also "RPS", below.
MPS Maintenance Power Signature; the signal a PD sends to the switch to
indicate that the PD is connected and requires power. Refer to figure 3
on page 12.
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General PoE Operation
Term Use in this Manual
PD Powered Device. This is an IEEE 802.3af-compliant device that receives
its power through a direct connection to a 10/100Base-TX PoE RJ-45 port
on the switch. Examples ofPDs include Voice-over-IP (VoIP) telephones,
wireless access points, and remote video cameras.
port-number Refers to the type of power prioritization where, within a priority class,
priority the switchassigns the highest priority to the lowest-numbered port, the
second-highest priority to the second lowest-numbered port, and so-on.
Note that power priority rules apply only if PoE provisioning on the switch
becomes oversubscribed.
PoE Power-Over-Ethernet; the method by which PDs receive power fromthe
switch (in compliance with the IEEE 802.3af standard).
PSE Power-Sourcing Equipment. A PSE, such as a Switch 2626-PWR or 2650-
PWR, provides power to IEEE 802.3af-compliant PDs directly connected
to 10/100Base-TX PoE RJ-45 ports on the switch. The Switch 2626-PWR
and 2650-PWR are endpoint PSEs.
RPS Redundant Power Supply; for example, an HP 600 RPS/EPS. An RPS
device provides power to a switch if the switch’s internal power supply
fails. RPS power does not provision PoE ports on a switch whose internal
power supply has failed. See also "EPS", above.
General PoE Operation
Configuration Options
In the default configuration, all 10/100Base-TX ports on the switch are config-
ured to support PoE operation. You can:
■ Disable or re-enable per-port PoE operation on some ports to help
control power usage and avoid oversubscribing PoE on the switch.
■ Configure per-port priorityfor allocating power in case the switch
becomes oversubscribed and must drop power for some lower-
priorityports to support the demand on other, higher-priority ports.
■ Configure a global power threshold on the switchto act as a trigger
for sending a notice when the switchexceeds or goes below a specific
level of PoE power consumption.
Note� The PoE ports on your switch support standard networking links and PoE
links. Thus, you can connect either a non-PoE deviceor a PD to a PoE-enabled
port without reconfiguring the port.
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General PoE Operation
PD Support
The switch must havea minimum of 15.4 watts ofunused PoE power available
when you connect an 802.3af-compliant PD, regardless of how much power
the PD actually uses. On the Switch 2626-PWR, there will always be enough
power available to connect and support 802.3af PoE operation on all 24 10/
100-TX ports. On the Switch 2650-PWR, however, it is possible to oversub-
scribe the available PoE power. In this case, one or more PoE devices
connected to the switch will lose power. That is:
■ Sufficient PoE Power Available: When a Switch 2650-PWR detects
a new PD, and if the switch has a minimumof15.4 watts of PoE power
available, the switch supplies power to the port for that PD.
■ Insufficient PoE Power Available: When a Switch 2650-PWR
detects a new PD, and if the switch does not have a minimum of 15.4
watts of unused PoE power available:
• If the new PD is connected to a port "X" having a higher PoE priority
than another port "Y", the switchremoves PoE power from port "Y"
and delivers it to port "X". In this case the PD on port "X" receives
power and the PD on port "Y" is denied power.
• If the new PD isconnected to a port "X" having a lower priority than
all other PoE ports currently providing power to PDs, then the switch
does not deliver PoE power to port "X".
Note thatoncea PD connects to a port and begins operating, the port retains
only enough PoE power to support the PD’s operation. Unneeded power
becomes available for supporting other PD connections. Thus, while 15.4
watts must be available for the switch to begin supplyingpower to a port with
a PD connected, 15.4 watts per port isnot continually required if the connected
PD requires less power. For example, with 20 watts of PoE power remaining
available on the switch, you can connect one new PD without losing power to
any currently connected PDs. If that PD draws only 3 watts, then17 watts
remain available and you can connect at least one morePD without interrupt-
ing power to any other devices. If the next PD you connect draws 5 watts, then
only 12 watts remain unused. With only 12 watts available, if you connect yet
another PD, the lowest-priority port will lose PoE power until the switch once
again has 15.4 or more watts available. (For information on power priority,
refer to “Power Priority” on page 5.)
Disconnecting a PD from a port causes the switch to stop providing PoE power
to that port and makes the power available to other ports configured for PoE
operation. If the PoE demand becomes greater than the available power, the
switch transfers power from lower-priority ports to higher-priority ports.
(Ports not currently providing power to PDs are not affected.)
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General PoE Operation
Note� 15.4 watts of available power isrequired for the switch to begin delivering
power to a port, suchas when a newly connected PD is detected or when
power isreleased fromhigher priority ports. Depending on power demands,
lower-priorityports on a switch with high PoE power demand may occasion-
aly lose power due to the demands of higher-priority ports. (Refer to“Power
Priority” on page 5.)
Table 1. Port-Group Maximum Power Allocations
PoE Power
Sources
PoE for
Switch 2626-PWR
PoE for
Switch 2650-PWR
Internal 406 watts available to support PoE 406 watts available to support PoE
Only operation on ports 1-24.1 operation on ports 1-48.1
Internal Redundant 368/1842watts
and EPS available to ports 1-24. (The switch
uses EPS power on ports 1-24 only
if the internal power supply fails.)
• Ports 1-24: 406 watts available (provided
by the internalpower supply).
• Ports 25-48:
– 368 watts available if the EPS
connects to only one switch.
– 184 watts available if the EPS
connects to two switches.
(If the internal power supply fails, the EPS
provides either 368 watts or 184 watts to
ports 1-48, depending on whether the EPS
connects to one or two switches. Note that
38 watts of this power are alwaysallocated
exclusively to ports 25-48.)
1The switchuses 38 watts for internal PoE processes, which leaves 368 watts to provision
PDs connected to ports 1 - 24 (2626-PWR) or 1 - 48 (2650-PWR).
2If both EPS ports on the HP 600 RPS/EPS are connected to switches, each switch can receive
184 watts of PoE power. If only one switch is connected to the EPS port, that switch can
receive 368 watts of PoE power.
Power Priority
When Does the Switch PrioritizePower Allocations? If the switch can
provide power for all existing PD demands, it does not use its power priority
settings to allocate power. However, if the PD power demand oversubscribes
the available power, then the switch prioritizes the power allocation to the
ports that present a PD power demand. This causes the switch to remove
power from one or more lower-priority ports to meet the power demand on
other,higher-priority ports. (This operation occurs, regardless of the order in
which PDs connect to the switch’sPoE-configured ports.)
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General PoE Operation
How Does the Switch Prioritize Power Allocations? The switch simul-
taneously uses two prioritymethods:
■ The priority class method enables port PoE priority class assign-
ments of Low (the default), High, and Critical.
■ The port-number priority method gives a lower-numbered port
priority over a higher-numbered port within the sameconfigured
priority class.
Suppose, for example, that you configure PoE priority as shown in table 2.
Table 2. Exampleof PoE Priority Operation
Port Priority
Setting
Configuration Command1and Resulting Operation
25 - 48 Critical This priority class alwaysreceives power. If there is not enough power to provision PDs on
all of the ports configured for this class, then no power goes to ports configured for High and
Low priority. If there is enough power to provision PDs on only some of the "Critical" ports,
thenpower is allocated to the "Critical" ports in ascending order, beginning with the lowest-
numberedport in the class, which, in this case, is port 25. For this example, the CLI command
to set portsto “Critical” is:
HPswitch(config)# interface e 25-48 power critical
9 - 12 High This priority class receives power only if all PDs on ports with a Critical priority setting are
receiving full power. If there is not enough power to provision PDs on all ports with a High
priority, then no power goes to ports with a Low priority. If there is enough power to provision
PDs on only some of the "High" ports, then power is allocated to the "High" ports in ascending
order, beginning, in this example, with port 9, until all available power is in use. For this
example,the CLI command to set ports to “High”is:
HPswitch(config)# interface e 9-12 power high
1 - 8 Low This priority class receives power only if all PDs on ports with High and Critical priority
settings are receiving power. If there is enough power to provision PDs on only some Low
priority ports, then power is allocated to the ports in ascending order, beginning with the
lowest-numbered port in the class (port 1, in this case), until all available power is in use. For
this example, the CLI command to set ports to “Low”2is:
HPswitch(config)# interface e 1-8 power low
13 - 24 - n/a - For this example, PoE is disabled on these ports. The CLI command for this setting is:
HPswitch(config)# no interface e 13-24 power
1 For a listing of PoE configuration commands, with descriptions, refer to “Configuring PoE Operation” on page 7.
2 In the default PoE configuration, the ports are already set to the low priority. In this case, the command is not necessary.
6