Gigabit L3 Switch
Stacking Master & Modular Gigabit Layer 3 Switch
Stacking Up 12 DES-3226S Switches
12-Port Gigabit Switch With 4 Combo 1000BASE-T/SFP & 2 Expansion
Slots, Redundant Power Support
The DGS-3312SR switch is a powerful, function-rich Layer 3 switch that gives the network administrator the flexibility to use it
as a Stacking Master Switch, or as an all-Gigabit Modular Switch supporting copper and fiber connections. With 12 dedicated
2Gbps links to 12 stackable switches in the fault tolerant star architecture, redundant power backup, modular configuration,
Layer 3 packet routing and extensive management capability, this highly versatile switch gives you the functions and flexibility
needed to set up and run a departmental/enterprise network for mission-critical applications.

Modular Architecture
Scalable Expansion With 288 10/100BASE-TX & 12
The DGS-3312SR provides 4 10/100/1000BASE-T ports, 4 combo SFP
Gigabit Ports
(mini GBIC) slots and 2 open expansion slots. The expansion slots
By stacking a DGS-3312SR with 12 DES-3226S switches, you
allow you to flexibly deploy this switch as a Stacking Master Switch, or
can have as many as 288 10/100BASE-TX ports for departmental
as a stand-alone all-Gigabit switch. The expansion slots support the
user connection, plus 12 Gigabit ports for server and backbone
following expansion modules:
attachment. This architecture allows you to easily add switch units
- DEM-540 4-port stacking module. This module allows you to stack up
as your need grows, without making changes to your existing
4 DES-3226S stackable switches. With 2 DEM-540 modules installed
network hardware.
in the expansion slots, you can stack up to 8 stackable switches.
- DEM-340MG 4-port SFP (mini GBIC) module. This module provides
12-Port Collapsed Backbone
4 SFP slots for installation of 4 Gigabit transceivers supporting short,
If you opt to use your DGS-3312SR as a stand-alone Gigabit
medium and long distance fiber cables.
switch, you can install up to 2 Gigabit modules in the expansion
- DEM-340T 4-port copper Gigabit module. This module provides 4
slots. This will give you 8 Gigabit ports, in addition to the 4 built-
10/100/1000BASE-T ports for 4 copper Gigabit connections.
in 1000BASE-T/combo SFP ports, making it a total of 12 Gigabit
ports. This type of deployment gives you a small collapsed
Fault Tolerant Switch Stacking
backbone to which 12 switches and servers can be attached. All
Using 2 DEM-540 stacking modules and the 4 built-in 1000BASE-T/
ports on the DGS-3312SR support jumbo frames to alleviate
SFP combo ports, the DGS-3312SR Stacking Master can stack up 12
heavy network traffic. Copper and fiber cables can be deployed,
D-Link stackable switches. The stacking scheme uses the star
depending on your selection of the port modules.
architecture, where packets are switched directly through the Stacking
Master. This architecture provides for fault tolerance, as any single
Redundant Power Support
broken link between a switch and the Stacking Master will not affect the
The DGS-3312SR can be connected to an external power supply
rest of the links of the stack. This compares favorably with the ring
for redundant power backup purposes. In case the built-in internal
architecture, where a fail over link between any 2 switches can break
power supply fails, the optional redundant power supply unit will
the link of an entire stack.
automatically provide all the required power to ensure continuous
Higher Performance Switch Stacking
Instead of a 2Gbps bandwidth shared by the entire stack in a ring
Wire-speed IP Routing
architecture, the DGS-3312SR gives each of the switches on the stack a
The switch provides basic IP routing, with instant support for
dedicated 2Gbps bandwidth from a Stacking Master stacking port. This
Windows, Unix and Internet environments. It provides wire-speed
brings the total bandwidth up to 24Gbps when 12 switches are stacked
non-blocking switch fabrics with hardware-based packet
through the Stacking Master.
filtering/forwarding. Packet routing is performed by on-board
ASICs at speeds many times faster than CPU-based routers.

Product Description
Gigabit L3 Switch
Seamless Integration
Flexible Transmission Scheduling
The DGS-3312SR can be instantly integrated into any existing
The switch supports 2 methods of packet transmission scheduling:
network for seamless integration of Layer 2 and Layer 3 packet
Strict Priority Queuing and Weighted Round-Robin (WRR). You
switching. With multi-layer support for every port, you can start with
can select to use Strict Priority Queuing to strictly enforce your
Layer 2 switching, then upgrade to Layer 3 routing anytime by simply
priority queues, or WRR to address bandwidth limitations at peak
re-configuring the ports. You can flexibly segment the network into
time. WRR allows each queue to be assigned a different
domains and sub-domains, using (1) subnet IDs and user IP numbers
percentage of the output port's bandwidth, so that lower-priority
to route traffic, and (2) custom filters based on users' physical MAC
queues are not denied access to buffer space and port bandwidth.
addresses to filter extraneous traffic. At Layer 2, the switch uses auto-
learned and user-defined MAC addresses to discard and forward
IGMP Snooping for Broadcast Control
packets. At Layer 3, it looks at the user-specified routing table to route
The switch listens to IGMP (Internet Group Management
packets to their destinations.
Protocol) messages to build mapping table and associate
forwarding filters. It dynamically configures the switch ports to
VLANs for Enhanced Security & Performance
forward IP multicast traffic only to those ports associated with
The DGS-3312SR supports 802.1Q and port-based VLANs to
multicast hosts.
improve security and bandwidth utilization. This limits the broadcast
domains and confines intra-group traffic within their segments. The
Broadcast Storm Control
switch also supports GVRP (GARP VLAN Registration Protocol) for
To prevent too many broadcast/multicast from flooding the
automatic VLAN configuration distribution.
network, broadcast/multicast storm control is configured to screen
excessive traffic. Threshold values are available to control the rate
Advanced Network Access Management
limit for each port. Packets are discarded if the respective count
802.1x features enable user authentication for each network access
exceeds the configured upper threshold in a given time interval.
attempt. Port security features allow you to limit the number of MAC
The possible range of upper threshold is from 0 to 255k packets
addresses per port in order to control the number of stations for each
per second.
port. Static MAC addresses can be defined for each port to ensure only
registered machines are allowed to access. By enabling both of these
Port Mirroring
features, you can establish an access mechanism based on user and
This function allows you to mirror adjacent ports for the purpose
machine identities, as well as control the number of access stations.
of analyzing incoming and outgoing packets where packet
patterns can be studied.
Multi-Layer Access Control List (ACL)
Access Control Lists (ACL) allow the network administrator to define
Spanning Tree for Redundant Backup Bridge Path
policies on network traffic control. The switch supports
For mission critical environments with multiple switches
comprehensive and multi-layer ACLs, providing a powerful tool for
supporting STP, you can configure the stack with a redundant
network management. For example, the switch can be set to block
backup bridge path, so transmission and reception of packets can
malicious bulk traffic from specific clients based either on MAC or IP
be guaranteed in event of any fail-over switch on the network. The
addresses. Or during a virus attack, the switch can be set to restrict its
DGS-3312SR supports 802.1D Spanning Tree compatible and
flooding based on a virus's unique pattern based on TCP/UDP port
802.1w Rapid Spanning Tree.
Multiple Management Interfaces
Advanced CoS Support
SNMP v.1, v.3 network management is supported, using the built-
The switch supports not only Layer 2 802.1p Priority Queue control,
in MIBs. RMON monitoring and SYSLOG are provided for
but also a variety of ways to prioritize network packets. Multi-layer
effective central management. The switch also provides a
information from L2 to L4 can be used to classify packet priorities.
Command Line Interface (CLI) and a Web-based GUI. CLI
This function allows you to attach IP telephony devices or video
enables quick system configuration for administrators familiar
servers to the switch to run delay-sensitive applications like video
with command line operation. The embedded Web-based interface
conference. The DGS-3312SR supports up to 8 CoS (Class of Service)
allows you to easily access the switch from anywhere on the
queues in the stand-alone mode, and up to 4 CoS queues in the
network and troubleshoot it in real-time. You can, for example,
Stacking Master mode.
browse the MAC address table via the Web browser and perform
searching to identify the location of any workstation. Port
utilization graphs provide real-time traffic monitoring and
diagnostic information.
4 built-in 10/100/1000BASE-T ports
IGMP snooping, 802.1p Priority Queues, port mirroring support
4 built-in combo SFP (mini GBIC) *
Multi-layer (Layer 2 to Layer 4) ACL and CoS support
2 expansion slots for stacking or Gigabit port module installation
Broadcast storm control
Selection of 4-port 1000BASE-T and SFP modules for expansion
802.1D compatible, 802.1w Rapid Spanning Tree for redundant
backup bridge paths
Redundant power supply support
SNMP v.1, v.3 network management, 4 groups of RMON
Up to 288 10/100BASE-TX ports and 12 Gigabit ports with 24Gbps
802.1x port-based/MAC-based access control
back plane when stacked with DES-3226S switches
Per-port bandwidth control
Dedicated 2Gbps bandwidth between Stacking Master and each
802.3ad LACP port trunks
stackable switch
Command Line Interface, TFTP firmware upgrade, Web-based
Jumbo frame support (up to 9,216 bytes)
management, Web GUI Traffic Monitoring support
IP routing supporting RIP-1, RIP-2, OSPF routing protocols,
SNMP management/MIB support
DVMRP, PIM Dense mode
802.1Q VLAN, GARP/GVRP support

* Use of the SFP will disable their corresponding built-in 10/100/1000BASE-T

Technical Specifications
Gigabit L3 Switch
Device Ports
- Multi-layer Access Control List (ACL) based on:
- 4 built-in 10/100/1000BASE-T ports
- 4 built-in combo SFP (mini GBIC) *
- RS-232 console port
Diffserv (DSCP)
* Use of the SFP will disable their corresponding built-in 10/100/1000BASE-T connections. These
IP address
Gigabit ports can be configured for server/backbone attachments, or for switch stacking.
Protocol type
TCP/UDP destination port number
Number of Expansion Slots
* Functions available in next firmware upgrade
Port Modules (for expansion slots)
Spanning Tree
- DEM-540: 4 stacking ports
- 802.1D compatible
- DEM-340MG: 4 SFP slots
- 802.1w Rapid Spanning Tree
- DEM-340T: 4 10/100/1000BASE-T ports
Port Standard/Function Support
- IGMP v2
- IEEE 802.3 10BASE-T/802.3u 100BASE-TX/802.3ab 1000BASE-T
- IGMP Snooping
- ANSI/IEEE 802.3 NWay auto-negotiation
- IEEE 802.3x Flow Control
- Port mirroring
Port Trunk
- Number of ports per trunk: 8 (max.)
SFP (Mini GBIC) Support
- Number of trunk per switch: 6 (max.) (in DGS-3312SR stand-
- IEEE 802.3z 1000BASE-LX (DEM-310GT transceiver)
alone mode only)
- IEEE 802.3z 1000BASE-SX (DEM-311GT transceiver)
- Trunking mode: static
- IEEE 802.3z 1000BASE-LH (DEM-314GT transceiver)
- Operation mode: load sharing
- IEEE 802.3z 1000BASE-ZX (DEM-315GT transceiver)
- 802.3ad LACP support
Forwarding Rate
17.8Mpps (max.)
Transmission Method
Switch Fabric
MAC Address Table
16K entries per device
Diagnostic LEDs
Per device:

Routing Table
- Power
2K entries per device
- Console
MAC Address Learning
Per RJ-45 port:
- Dynamic entries: automatic update
- Speed
- Static entries: user-defined
- Link/Act
Per SFP port:
Layer 2 Packet Filtering/Forwarding Rates (half duplex)
- Link/Act
1,488,100 pps per port (max.)
RAM Buffer
IP Routing
1MB per device
- IP v4 support
- IP Fragmentation support
Jumbo Frame Size
- Routing protocols supported:
Up to 9,216bytes
Static routing
RIP-1, RIP-2
Broadcast Storm Control
OSPF v.2
Rate control of Broadcast, unknown Multicast and Unicast packets
Configuration & Management
- IEEE 802.1Q Tagged VLAN
Management Support
- Port-based VLAN (non-overlapping)
- SNMP v.1, v.3
- Web-based management
- Maximum number of VLANs: 255 (Stacking Master mode),
- CLI (command line interface)
4K (stand-alone mode)
- RMON monitoring
- Telnet server
Priority Queues (CoS)
- Telnet remote control console
- Standard: IEEE 802.1p
- Number of queues: 4 per port (Stacking Master mode),
- Web GUI traffic monitoring
8 per port (stand-alone mode)
- Password enable
- Web MAC address browsing
Traffic Classification (CoS)
- SNMP trap on MAC notification
Can be based on user-definable application types:
- IP filtering on management interface
- Diffserv (DSCP)
- Port-based
- MAC address
- MIB-II (RFC 1213)
- IP address
- Bridge MIB (RFC 1493)
- TCP/UDP port number
- RMON MIB (RFC 1757)
- RIP (RFC 1724)
Network Access Security
- OSPF (RFC 1850)
- 802.1x user authentication: port-based and MAC-based
- CIDR (RFC 2096)
- RADIUS client for 802.1x support
- 802.1Q VLAN/802.1p MIB (RFC 2674)
- SSH2 *
- IGMP MIB (RFC 2933)
- SSL *
- IF (Interface) MIB (RFC 2233)
- Ethernet-like MIB (RFC 1643)
- Cisco-like port security
- D-Link enterprise MIB

Technical Specifications
Gigabit L3 Switch
RMON Groups
1, 2, 3, 9 (Alarm, Statistics, History, Event)
IP Number Self-identification
Through DHCP client, Bootp client
Firmware Upgrade
TFTP client
Console Port
DB-9 RS-232 DCE
Physical & Environmental
Power Input
100 to 120 VAC, 50/60 Hz or 200 to 240 VAC, 50/60 Hz
Internal universal power supply
Redundant Power Backup Support
Connector to connect to external redundant power supply
Power Consumption

30 watts (max.) (without expansion modules)


60 x 60 mm DC fans x 1
Operating Temperature
o o
0 to 40 C
Ordering Information
Storage Temperature
Stacking Master & Modular L3 Gigabit Switch
o o
-25 to 55 C
DGS-3312SR 4 10/100/1000BASE-T ports,
4 combo SFP (mini GBIC), 2 expansion slots,
redundant power support
10% to 95% non-condensing
Optional Expansion Module
4 stacking ports
440 (W) x 309 (D) x 44 mm (H) (device only)
4 SFP GBIC slots
19-inch rack-mount width, 1 U height
4 10/100/1000BASE-T ports
Optional SFP Transceiver
4.4 kg (device only, without expansion modules)
SFP transceiver for 1000BASE-LX, single-mode
fiber, max. distance 10km, 3.3V
Emission (EMI)
SFP transceiver for 1000BASE-SX, multi-mode
- FCC Class A
fiber, max. distance 550m, 3.3V
- CE Class A
SFP transceiver for 1000BASE-LHX, single-mode
- C-Tick
fiber, max. distance 40km, 3.3V
- BSMI Class A
SFP transceiver for 1000BASE-ZX, single-mode
fiber, max. distance 80km, 3.3V
CSA International
Optional Redundant Power Supply
60 watts redundant power supply
2-slot redundant power supply chassis
8-slot redundant power supply chassis
Specifications subject to change without
TEL: 1-949-788-0805
FAX: 1-949-753-7033
prior notice.
Stacking Master
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trademarks belong to their proprietors.
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TEL: 90-212-335-2525
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Stack of 12 DES-3226S switches connected to a DGS-3312SR
TEL: 56-2-232-3185
FAX: 56-2-232-0923
TEL: 55-11-3094-2910
FAX: 55-11-3094-2921
Stacking Master in a star stacking scheme. 8 DES-3226S are connected
South Africa
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to the Stacking Master through their stacking ports. 4 other DES-3226S
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are stacked with stacking Master through the Gigabit ports.
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FAX: 886-2-2910-1515
Rev. 02 (Nov. 2003)
D-Link Corp.
TEL: 886-2-2916-1600
FAX: 886-2-2914-6299

Document Outline