[AusNOG] Single Switch Full 48-Port PoE Support

[Joshua D'Alton]

Yes, unless you use the commands to control it port/module wide, in which
case cisco doesn't care about the advertisment.


On Thu, Sep 12, 2013 at 9:33 AM, Tim March <march.tim at gmail.com> wrote:

>
> Thanks everyone for the on and off-list suggestions. We've got a list of
> devices to look at now. Much appreciated.
>
> @ Peter - The way I'd read the documentation the (Non PoE+ / .3at) Cisco
> 2960 will see the Class-4 advertisement, treat it as unsupported and
> default it to Class-0, which is 15.4W per port?
>
> Either way, I reckon we're on the right track now... Thanks again all...
>
>
>
> Cheers,
> T.
>
> On 11/09/13 9:07 PM, Peter Childs wrote:
> >
> >
> http://support.polycom.com/global/documents/support/technical/products/voic
> > e/Power_Consumption_TB_48152.pdf
> >
> > 2) VVX 500 and VVX 600 advertise as Class 4, in conformance with
> > IEEE802.3at specification
> > (backwards compatible with IEEE802.3af).
> >
> >
> > If they don't do that I would chat to Polycom as they often have lots of
> > software updates :)
> >
> > On 11/09/13 11:39 AM, "Tim March" <march.tim at gmail.com> wrote:
> >
> >>
> >> Hey Guys...
> >>
> >> A customer of mine needs to replace a bunch of non-PoE 48-port switches
> >> with PoE switches. Each of the switches will be required to power 48 IP
> >> phones. Due to a range of circumstances all relating to planning
> >> failures we need to use like-for-like form-factor ($n x 48 Port PoE
> >> Switches) to drive the phones.
> >>
> >> The phones are Polycom VVX 500 that draw a maximum of 5W per port for a
> >> total of 240W per switch. We've bene looking at 2960's and this fits
> >> nicely within it's 370W PoE budget. However, the .3af advertisement from
> >> the phone gets interpreted as Class-0 (15.4W) and the switch will only
> >> power >= 28 devices concurrently.
> >>
> >> On the Catalyst we're able to get around this (I think?) with the `power
> >> inline max` config directive to force it to spread the power budget
> >> across all ports.
> >>
> >> For what we're trying to do a set of 2960's will come in around $25k.
> >>
> >> My question is: Can any of you guys suggest cheaper switches that will
> >> allow us to run 48 x 5W PoE from a single device with the ability to
> >> ignore the 15.4W .3af advertisement that will tell the switch to shut
> >> down the additional ports?
> >>
> >>
> >>
> >> Cheers,
> >> T
> >>
> >> --
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> >
>
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