[AusNOG] Running out of VLANs

[Robert Hudson]

Be wary of the "stackability" of the 3750s.  I've seen them fall in a nasty
heap.  I've also heard reports of a single switch failing in a stack taking
the whole stack down (despite the fact that the stack is meant to mean this
isn't the case.  I hope you're using full duplex stacking too (I've seen
plenty of intances where 3750 switches are not connected in a full loop,
and thus only running simplex communication over the stacking cables).

Reuben was spot on about the suitability of 3750s for the kind of work
you're doing too - they're simply not designed to do it.  You'd be better
with a modular chassis-based routing platform from any one of the decent
vendors in the switching and routing space.  Brocade would be my first port
of call (but that won't surprise anyone here).


On 16 December 2013 14:38, James Mcintosh <james.mcintosh at rocketmail.com>wrote:

> Hi Reuben,
>
> Yes you are correct we're using 3750's. One of the main reasons we went
> for these is because they're stackable and we need many more ports than are
> available on ME3600/ME3800's. It makes life much easier to have a single
> logic switch rather than a heap of them connected via uplinks.
>
> Are you suggesting plugging in carrier links directly into routers? If so
> that's not feasible for us as we have more carrier links than router
> interfaces.
>
>
> -James
>
>
>   On Monday, 16 December 2013 2:25 PM, Reuben Farrelly <
> reuben-ausnog at reub.net> wrote:
>  On 16/12/2013 2:20 PM, James Mcintosh wrote:
> > Hi Noggers,
> >
> > What are people doing about hitting switch VLAN limits? We terminate a
> > lot of Ethernet services from several carriers. Our Cisco switch gear is
> > great but limited to 128 spanning tree VLAN sessions and 1,000 VLANs.
>
> Which switch platform/models are you using?
>
> By the sounds of it, you're probably using 3560/3750's...which if this
> is the case is probably not a good idea (they're floor access switches,
> not designed for what you're doing and to be honest, not suited to this
> either).
>
> The answer is to either migrate to trunked subinterfaces on a router, OR
> (and this is what I would recommend as the best choice), migrate to the
> Cisco ME3600/ME3800 platform which scales to this degree, easily, and
> gives you lots of nice functionality (such as per-port vlan
> significance) that you probably don't have right now.
>
> Reuben
>
>
>
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