[AusNOG] Running out of VLANs

[Beeson, Ayden]

I was thinking the same to be honest; a nice chassis based system would work well.

Depending on the feature set you required and your risk levels, a 6500 chassis plus line card can be had for pretty cheap, even the Sup 2T's with -E series chassis' can be bought from Cisco resellers (refurbished or just not used in a sale) for pretty cheap (or new if the budget allows for it)

Otherwise there is the new 68xx stuff coming out soon, or you could do as was stated and get the ME gear.

Might just be a case of biting the bullet, breaking up your link aggregation into two tiers, stacking your switches into 2 logical stacks back into a larger piece of gear to do the vlans aggregation....

Thanks,
Ayden Beeson

From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Robert Hudson
Sent: Monday, 16 December 2013 2:52 PM
To: ausnog at lists.ausnog.net
Subject: Re: [AusNOG] Running out of VLANs

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<mailto: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<mailto: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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