Consolidated Platform Configuration Guide, Cisco Ios Release 15.2(4)E (Catalyst 2960-X Switches - Cisco Catalyst 2960 series Configuration Manual

Configuring 2-event Classification
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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.
Information about 2-event Classification
When a class 4 device gets detected, IOS allocates 30W without any CDP or LLDP negotiation. This means
that even before the link comes up the class 4 power device gets 30W.
Also, on the hardware level the PSE does a 2-event classification which allows a class 4 PD to detect PSE
capability of providing 30W from hardware, register itself and it can move up to PoE+ level without waiting
for any CDP/LLDP packet exchange.
Once 2-event is enabled on a port, you need to manually shut/un-shut the port or connect the PD again to start
the IEEE detection again. Power budget allocation for a class-4 device will be 30W if 2-event classification
is enabled on the port, else it will be 15.4W.
Configuring 2-event Classification
To configure the switch for a 2-event Classification, perform the steps given below:
Finding Feature Information, page 103
Information about 2-event Classification, page 103
Configuring 2-event Classification, page 103
Example: Configuring 2-Event Classification, page 105

Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)

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