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HPE 2530 switch problems with POE and Cisco phones with key management unit

 
HankBurton
Occasional Visitor

HPE 2530 switch problems with POE and Cisco phones with key management unit

I've installed an HP 2530 48 port switch, and I'm having problems getting Cisco 8851 phones with a key management side car / add on.  The KEM won't power up on all phones.  There are five phones with this setup. One actually powers on, but the other 4 don't.  I cannot tell if it's a config issue on the switch or something with the phone config.  Unfortunately, I don't have access to the phone config.

With the default switch configuration, the phones startup and indicate that the accessory cannot be started. When I look at the phone log, I find a line item indicating that a request for power is made but it is denied.  This is with the POE+ option TLV enabled.

If I turn off POE+ and just use LLDP-MED, the accessory still doesn't power up but there is no message about the accessory not being started.  When I look at the phone log, I find a lite item about a timeout occuring when the request for additional power is made.

I don't manage the phones.  I'm trying to get the HP switch in place to avoid having my client purchase the Cisco switches the phone vendor wants to install.  There's almost a 3x price difference !!!

Thanks for your help.

 

2 REPLIES
HankBurton
Occasional Visitor

Re: HPE 2530 switch problems with POE and Cisco phones with key management unit

With the POE+ TLV enabled, this is an excerpt from the Cisco 8851 log file related to power:

3314 ERR Aug 15 20:09:50.087739 CDP-lldpProcessPowerTLV() power negotiation denied
3315 NOT Aug 15 20:09:50.087868 PWRMAN-eventPwrNeg(): curReq.valid: 1  info->curPwr: 8800  curReq.newPwr: 11800
3316 WRN Aug 15 20:09:50.087905 PWRMAN-eventPwrNeg(): power neg failed: DENIED
3317 NOT Aug 15 20:09:50.087966 DMAN(483)-isPowerAvailable(): Response from PM: NO POWER
3318 NOT Aug 15 20:09:50.087994 DMAN(483)-lkemHandler(): Power Request for KEM Rejected.

The switch isn't out of power.  The port is configured to allow more power than 11.8 W.

MobileConnects
Occasional Visitor

Re: HPE 2530 switch problems with POE and Cisco phones with key management unit

Hi Hank,

Did you find solution to this issue? I got the same issue (Cisco 8851 with Expansion Module) and HP Switch.

Thanks.