Dell Networking N2048 Managed Switch

The Dell Networking N2048 is a 1U campus access switch with 48 RJ45 10/100/1000Mb auto-sensing ports, two front 10GbE SFP+ uplink ports and two dedicated rear stacking ports rated 21Gbps each. It moves 220Gbps of switch fabric at a 164Mpps forwarding rate, runs Dell EMC Networking OS6, and stacks up to twelve units under a single management address.

Where this switch belongs

This is wiring-closet hardware. Dell positioned the N-series at the IDF and MDF layer of a campus network - the switch that user ports, access points, phones and cameras plug into, uplinked over fibre or twinax to an aggregation layer. It is not a top-of-rack data centre switch and it is not trying to be: there are no 25G or 40G ports, the buffer is sized for access traffic rather than incast, and the whole design is built around port density per rack unit and low power draw rather than raw throughput.

Within that role it is a strong fit for offices, schools, clinics, warehouses and any site where the requirement is a few hundred gigabit access ports that are cheap to run and simple to manage. Where powered devices are needed, the PoE+ variant of this model covers them without changing anything else about the design.

Uplinks and oversubscription

Two front 10GbE SFP+ ports give 20Gbps of uplink against 48Gbps of access capacity, a 2.4:1 oversubscription ratio if every access port ran at line rate simultaneously - which they never do on a campus edge. The important design point is that on the N2000 those two SFP+ cages stay free no matter what, because stacking uses dedicated rear ports rather than borrowing from the front. A twelve-high stack still has both uplinks on every member.

The SFP+ ports take 10GbE SR, LR, LRM or ER optics, 1G SFP optics if the uplink is still gigabit, or SFP+ twinax direct attach cable from 0.5m to 7m for a short run to an aggregation switch in the same rack or the one next to it. Twinax is the cheapest option and the one most closets should use.

Stacking to twelve units

Two rear stacking ports at 21Gbps each carry up to 84Gbps full duplex between members, and up to twelve switches can be managed from one IP address - up to 600 gigabit ports in a single logical device. For a multi-floor building that is the difference between twelve management targets and one. Non-stop forwarding and fast failover mean the stack keeps passing traffic when the master changes, and MLAG lets you dual-home downstream devices across two chassis for link and chassis redundancy at the same time.

Stacking uses Dell's stacking cable, available in 0.5m, 1m and 3m lengths. Members do not have to be the same model - mixing 24-port and 48-port N2000 units in one stack is normal practice, which is useful when a closet needs 72 ports rather than a round number.

Routing: Layer 3 Standard with OSPFv2

The N2000 is a Layer 3 Standard platform. It does static routing, RIP and OSPFv2 for both IPv4 and IPv6, with 256 static IPv4 routes, 128 static IPv6 routes, 256 dynamic IPv4 routes and 256 routing interfaces. Layer 3 routing is line-rate and non-blocking on every port.

OSPFv2 is the capability that matters most in practice and the one that separates this family from the N1500 below it. If the campus design routes at the closet rather than trunking everything back to a core - and many now do, to keep broadcast domains small - the N2000 can participate in the OSPF area directly. The N1500 cannot; it is Layer 3 Lite, meaning static routes and RIP only. Anyone weighing the two families against each other should check this first, because it is not a performance difference that can be worked around, it is a missing protocol.

The switch supports 4,094 VLANs and 32K MAC addresses, which is generous for the role and means a large flat campus will run out of other things before it runs out of table space.

Power, cooling and cord type

Power draw is modest: 53.9W maximum with a maximum thermal output of 167.7 BTU/hr, from an integrated 100W 80PLUS-certified supply. Energy-Efficient Ethernet is settable per port and the switch uses lower-power PHYs and short-cable detection to cut draw on idle links, which adds up across a building.

The supply is integrated and not removable, so there is no second internal PSU to add. If the closet needs power redundancy, the optional external unit is the only route to it. This model uses a standard C13 cord.

Management and day-two operations

The switch runs Dell EMC Networking OS6, the shared N-series operating system, with dual firmware images held on-board so an upgrade can be rolled back without a console visit. Management is available through the CLI over console, Telnet or SSHv2, through the embedded web GUI, and through SNMP v1/v2c/v3 including Dell OpenManage Network Manager. USB auto-configuration is the feature most worth knowing about for multi-site rollouts: the switch will pull its configuration from a USB flash drive at boot, so a closet can be commissioned by someone who has never touched a switch CLI. The N2000 also interoperates with Cisco RPVST+ and carries Dell ISDP for discovery against CDP-speaking devices, which matters if the switch is going into a closet that still has Catalyst gear in it.

Access control is handled by authentication tiering, which lets you order 802.1X, MAC Authentication Bypass and Captive Portal on a single port so that a laptop, a printer and a guest device can all land on the same physical port and be treated differently. AAA authorization with TACACS+ accounting and RADIUS is supported, along with Private VLAN extensions and Private VLAN Edge for tenant separation, and RSPAN for monitoring a port from somewhere else in the Layer 2 domain without a dedicated tap.

Choosing between this and its siblings

• N2048P - identical switching, with PoE+ on every port. Choose it if access points, phones or cameras are going on this switch.
• N2024 - the 24-port version of the same switch. Port count is the only meaningful difference within a family apart from the fabric and forwarding figures that scale with it.
• N1548 - the N1500 equivalent. Fewer VLANs, half the MAC table, a four-unit stack instead of twelve, and no OSPF - but four SFP+ ports instead of two. Sensible for a small standalone closet, the wrong choice for a routed-access design.

A secondary-market-only platform

Dell has retired the N-series from its own catalogue. The N1100, N2200 and N3200 series pages on Dell's store now redirect to the Dell homepage, and no N1500 or N2000 model appears in Dell's current switching line-up at all. That has a practical consequence for anyone standardising on this platform: there is no new-unit channel to buy from, so refurbished hardware is not the budget alternative here, it is the only supply. It also means spares planning matters more than it would on a current platform. Buying a cold spare alongside the production units is the normal approach, and it is worth doing while the model is still plentiful.

Every unit we ship is tested and supplied with warranty. Configuration, cabling and optics are all commodity items on this generation, which is part of why the platform remains a sensible campus choice rather than a compromise.