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Forum Discussion
MS108EUP not supporting LLDP in a good way?
Hi, I am working quite a bit with hardware and software POE negotiation, and my view of the 802.3 standard is that the switch should announce it's LLDP capabilities and settings (including Power-...
Ill add some more:
Why I say this, and why I prefer this is because the PD needs to know if it should start LLDP negotiation or not.
Currently many devices send LLDP power-via-MDI requests blindly, to "wake up" the LLDP protocol in the switch, but that is not how the standard intends switches to work, I think.
It causes a lot of problems for POE negotiation, when devices have to guess whether to request more (or less) power, and a lot of power is wasted on the PSE side, since switches don't know how much PDs really need.
Currently many devices send LLDP power-via-MDI requests blindly, to "wake up" the LLDP protocol in the switch, but that is not how the standard intends switches to work, I think.
Yes, if course. This is the same logic the more common PoE negotiation using pulses works. The PD has to explicitly request power from the PS, typically when the PD ist connected and the PHY link comes up.
The MS108EUP does not come with any explicit LLDP support (or related controls on the Web UI). I guess it's PoE controller does - like on the unmanaged MS108UP - listen to the LLDP power requests.
No "feature" needs to be announced from the PoE capable switch regardless to negotiate PoE power of any type.
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