Applying security features to PoE configurations
You can use the port security features built into the switch to control device or user access to the network through
PoE ports in the same way as non-PoE ports. Using Port Security, you can configure each switch port with a
unique list of MAC addresses for devices that are authorized to access the network through that port. For more
information, refer to the titled “Configuring and Monitoring Port Security” in the access security guide for your
switch.
Assigning priority policies to PoE traffic
You can use the configurable QoS (Quality of Service) features in the switch to create prioritization policies for
traffic moving through PoE ports. The table below lists the available classifiers and their order of precedence.
Table 6: Classifiers for prioritizing outbound packets
Priority
QoS classifier
1
UDP/TCP application type (port)
2
Device priority (destination or source IP address)
3
IP type of service (ToS) field (IP packets only)
4
VLAN priority
5
Incoming source-port on the switch
6
Incoming 802.1 priority (present in tagged VLAN environments)
For more on this topic, refer to the titled “Quality of Service: Managing Bandwidth More Effectively” in the
advanced traffic management guide for your switch.
PoE operation
Using the commands described in this chapter, you can:
• Enable or disable PoE operation on individual ports.
• Monitor PoE status and performance.
• Configure a non-default power threshold for SNMP and Event Log reporting of PoE consumption on either all
PoE ports on the switch or on all PoE ports.
• Specify the port priority you want to use for provisioning PoE power in the event that the PoE resources
become oversubscribed.
A PSE detects the power needed by a connected PD before supplying that power via a phase referred to as
"searching". If the PSE cannot supply the required amount of power, it does not supply any power. For PoE using
a Type 1 device, a PSE will not supply any power to a PD unless the PSE has at least 17 watts available. For
example, if a PSE has a maximum available power of 382 watts and is already supplying 378 watts, and is then
connected to a PD requiring 10 watts, the PSE will not supply power to the PD.
For PoE+ using Type 2 devices, the PSE must have at least 33 watts available.
Configuration options
In the default configuration, all ports in a switch covered in this guide are configured to support PoE operation.
You can:
Chapter 4 Power Over Ethernet (PoE/PoE+) Operation
107
