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Re: [lwip-devel] LLDP (Link Layer Discovery Protocol) for PoE?

From: Claudius Zingerli
Subject: Re: [lwip-devel] LLDP (Link Layer Discovery Protocol) for PoE?
Date: Fri, 24 Oct 2014 14:25:33 +0200
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0

Hi Mark,

I've implemented LLDP with the MED extension to support PoE+. What is your current issue? LLDP itself is quite easy. Just make sure to safely inject and extract packets at layer 2. Exctraction can be based on Ethertype, injection with a mutex around netif.linkoutput.



On 2014-10-21 18:01, MarkMcM wrote:
Has anyone implemented LLDP (Link Layer Discovery Protocol) for configuring
PoE (Power over Ethernet) with the LwIP stack?  Are there any pointers that
anyone can provide for doing this?

We have an Ethernet IP device (based around an ARM Cortex-M4 processor) that
requires more power than standard PoE provides, and will need to use the
higher power available with PoE+.  But the device will have to negotiate the
higher power allotment from the PoE switch through LLDP.

Thanks for any guidance that anyone can provide.

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