Feeds
80%

Drilling into a half-decent gigabit small-biz switch... from D-Link

The DGS-3420-28TC isn't from Cisco and I'm OK with this

Boost IT visibility and business value

Review I have a confession to make, dear readers. While I'm aware that this admission opens me up to virtually unlimited heckling from the Cisco-indoctrinated crowd, the truth of the matter is that D-Link switches have served me in good stead for over a decade. After having spent the past month reviewing D-Link's DGS-3420-28TC, I've decided its maker stands an excellent chance of remaining a staple vendor for my SMB clients for another decade.

The DGS-3420-28TC is a 24-port 1GbE switch with 4 10GbE SFP+ ports. It is marketed as a "Layer 2+ Managed Switch" as part of D-Link's xStack line. (xStack switches can all be stacked with one another.) It offers a web-based GUI for management as well as a Cisco iOS-alike command line - similar enough that those trained on Cisco can probably make their way around without needing the manual.

It supports the basics: various flavours of spanning tree (as well as loopback detection), VLANs (including basic Q-in-Q), some basic IGMP and MLD snooping and port-mirroring. It's the bare minimum I would expect from any switch that was rackmountable today. Layer 2 featureset, check.

The "2+" part of the featureset branding comes in with the layer 3 features it supports: IPv4 and IPv6 routing, basic QoS and rate limiting, various levels of authentication control and reasonable access control list capabilities. The featureset on this unit doesn't come anywhere close to that offered by enterprise offerings (like Dell's PowerConnect line) and would get eaten alive by a top-end Cisco switch. That's fair enough; it isn't aimed at the same market.

The vast majority of these switches that get deployed will probably never be used for anything excepting Layer 2 support. I expect that there will be a lot of deployments in which some configuration occurs... D-Link obviously envisions groups of these switches connecting hundreds of 1GbE devices and stacking among themselves via the 10GbE ports.

That will certainly be the case for some deployments, but for many others it will be seen as a way to get access to cheap 10GbE connectivity. I believe these switches will see extensive deployment within small businesses as a switch that allows 10GbE-equiped servers to talk to 1GbE devices, likely without other switches being involved on the network at all. In fact, I ordered a pair (primary and spare) for just such a deployment the other day.

Dlink SFP+

It will also see use as a top-of-rack switch in SMB server rooms where 24 1GbE servers and a couple of 10GbE servers are connected to a core switch – something like Supermicro SSE-X24S – via a link-aggregated pair of 10GbE ports. Chances are good that in both of these scenarios, the physical network will largely be unmanaged: one great big Layer 2 network with, at most, some VLANs to break up the broadcast domains. I've got a render farm on the drawing board based on exactly this configuration.

The D-Link switches I've deployed work well for the intended uses. Their failure rates are reasonable enough that I can put a set of identical switches into a given site and buy only one spare to sit on the shelf. I've never had a second one go while the first was getting RMAed, and I've only had a handful of RMAs over the course of a decade.

Buying an extra unit to keep as a spare on the shelf as your backup isn't exactly enterprise-class support, but the D-Link switches are certainly cheap enough for this to be a viable strategy. The DGS-1024D is normally $2,000 – though it can be found for ~$1500 - making it the entry point into 10GbE for most SMBs.

In the testing I've done on these switches, they perform acceptably well for typical traffic. Hit them with enough multicast traffic and the switch will fold like a cheap tent, but it'll handle layer 2 unicast traffic to full port speeds without complaint.

Layer 3 is another story entirely. Start using the switch for routing and the difference between the DGS-3420-28TC and pretty much any full-bore enterprise Layer-3 managed switch becomes rapidly apparent. The switch is perfectly capable of handling a few Gbit/sec worth of routing. 40Gbit/sec worth of routing, however, is nowhere within its remit. Tick-box support for a feature is explicitly not "turn the knobs to 11" support.

Dlink DGS-3420-28TC

Fair enough. While my CCNP friends will cheerily point to this as an excuse not to use these units, I can't agree. I've been using D-Link since my very first DES-1026G allowed me connect up some 1GbE servers to my passel of 10/100 desktops. I've probably got over a hundred DGS-1210-48 and at least 250 DGS-1024D switches still in the field. The DGS-3420-28TC will be joining them soon. ®

The essential guide to IT transformation

80%

Drilling into a half-decent gigabit small-biz switch... from D-Link

"Good enough" 10GbE switching for the cost conscious
Price: Comes in under $2K RRP

More from The Register

next story
The Return of BSOD: Does ANYONE trust Microsoft patches?
Sysadmins, you're either fighting fires or seen as incompetents now
Microsoft: Azure isn't ready for biz-critical apps … yet
Microsoft will move its own IT to the cloud to avoid $200m server bill
US regulators OK sale of IBM's x86 server biz to Lenovo
Now all that remains is for gov't offices to ban the boxes
Flash could be CHEAPER than SAS DISK? Come off it, NetApp
Stats analysis reckons we'll hit that point in just three years
Oracle reveals 32-core, 10 BEEELLION-transistor SPARC M7
New chip scales to 1024 cores, 8192 threads 64 TB RAM, at speeds over 3.6GHz
Object storage bods Exablox: RAID is dead, baby. RAID is dead
Bring your own disks to its object appliances
Nimble's latest mutants GORGE themselves on unlucky forerunners
Crossing Sandy Bridges without stopping for breath
prev story

Whitepapers

5 things you didn’t know about cloud backup
IT departments are embracing cloud backup, but there’s a lot you need to know before choosing a service provider. Learn all the critical things you need to know.
Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Build a business case: developing custom apps
Learn how to maximize the value of custom applications by accelerating and simplifying their development.
Rethinking backup and recovery in the modern data center
Combining intelligence, operational analytics, and automation to enable efficient, data-driven IT organizations using the HP ABR approach.
Next gen security for virtualised datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.