Hi every body!
I have few questions:
"Show power" shows a lot of informations. It also shows
PS TYPE WATT pS FAN STATUS
OUTPUT STATUS OPR STATE
What does" Ok" indicate in output status field?
"Show Power Inline" shows
interface Admin oper poer device
Does line code have Adminstrative mode?
What " auto" means under "Admin field" ?
thanks a lot!
1) without CDP the switch can only detect there is a power over ethernet device on cable but canno adjust the power level and this can be a problem on high number of phones
2) CDP is also used to extend the QOS trust boundary to the ip phone and to instruct the phone on the vlan-id of the voice vlan and the CoS bits to use on sending voip frames this is needeed to provide end-to-end QoS.
CDP is also handy in troubleshooting to locate a phone and to see its model (defining a phone with the wrong model on CCM makes it unusable).
A standards based alternative to CDP named LLDP has been developed and can be used on newer IOS images to support third party ip phones.
For all the reasons stated above CDP or LLDP shoud be running all the time on the switch ports.
Hope to help
The OK status when you issue the "show power" command indicates that the power supply/fan are operating normally and there are no alarms or faults detected.
The administrative field indicates the amount of power configured for that port which is a configurable option. Auto (which is the default) on a PoE port will automatically detect the amount of power needed to power the connected device. Here is a link showing how to configure power for PoE port.