[AusNOG] Switch Port Utilisation Monitoring

[Paul Wilkins]

The problem with traps, is you may have ports you never hear from. eg. If
you have a mix of 24 and 48 ports, and you haven't heard from the top half
of a switch. Essentially you'd have to create your own inventory of
switchport interfaces.

Kind regards

Paul Wilkins

On 14 April 2016 at 14:31, Nathan Phelan <nathan at interconnekt.com.au> wrote:

> Logging SNMP traps to some sort of database (as per BB’s suggestion)
> sounds like the way to go.
>
> If you don’t feel like rolling your own though you could try
> http://www.librenms.org/ (it’s a fork of Observium) – it has a per device
> event log (stored in mysql) which is searchable.
>
> Cheers,
>
> Nathan
>
>
>
> *From:* AusNOG [mailto:ausnog-bounces at lists.ausnog.net] *On Behalf Of *Ben
> Buxton
> *Sent:* Thursday, 14 April 2016 1:39 PM
> *To:* Tim Raphael <raphael.timothy at gmail.com>; Paul Wilkins <
> paulwilkins369 at gmail.com>
> *Cc:* <ausnog at lists.ausnog.net> <ausnog at lists.ausnog.net>
> *Subject:* Re: [AusNOG] Switch Port Utilisation Monitoring
>
>
>
>
>
> Define "used".
>
>
>
> Link up or actually carrying (meaningful) traffic?
>
> For the former, you'd want to capture events as they happen, typically via
> snmp traps. Then just look at  how many reported a link up trap (including
> those that havent reported link down since the last interval).
>
>
>
> For the latter, a raw packet count might suffice, but you'll have
> difficulty differentiating idle/keepalive traffic if the amount is low.
>
> Personally, I'd go with snmp traps/polls injected into Prometheus, but
> many people havent the time or inclination to change their mindset into
> vector/timeseries based systems (despite the advantages).
>
>
> BB
>
>
>
> On Thu, Apr 14, 2016 at 1:28 PM Tim Raphael <raphael.timothy at gmail.com>
> wrote:
>
> Lets assume I have SNMP available.
>
>
>
> Will Cacti be able to tell me over (for example) a week how many and which
> switch ports are used?
>
>
>
> - Tim
>
>
>
>
>
>
>
>
>
> On 14 Apr 2016, at 11:27 AM, Paul Wilkins <paulwilkins369 at gmail.com>
> wrote:
>
>
>
> MRTG and/or Cacti.
>
> (Assuming a "managed" switch ie. SNMP)
>
>
>
> Kind regards
>
> Paul Wilkins
>
>
>
> On 14 April 2016 at 13:20, Tim Raphael <raphael.timothy at gmail.com> wrote:
>
> Hi All,
>
> I would like a tool that could tell me exactly how many switch ports are
> in use across a given time period.
> This is an enterprise environment so it’s not just the case of taking a
> snapshot in time, devices turn on and off so I’d want something that could
> monitor the port counts for a week or so and spit out a report.
>
> Also, as per usual, the cheaper (free?) the better!
>
> Any ideas?
>
> - Tim
>
>
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