D-link DEM-340T, DEM-340MG BROCHURE

DEM-540

Gigabit L3 Switch

SOLUTIONS

DGS-3312SR

DEM-340MG

DEM-340T

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

The DGS-3312SR provides 4 10/100/1000BASE-T ports, 4 combo SFP
(mini GBIC) slots and 2 open expansion slots. The expansion slots
allow you to flexibly deploy this switch as a Stacking Master Switch, or
as a stand-alone all-Gigabit switch. The expansion slots support the
following expansion modules:

- DEM-540 4-port stacking module. This module allows you to stack up
4 DES-3226S stackable switches. With 2 DEM-540 modules installed
in the expansion slots, you can stack up to 8 stackable switches.

- DEM-340MG 4-port SFP (mini GBIC) module. This module provides
4 SFP slots for installation of 4 Gigabit transceivers supporting short,
medium and long distance fiber cables.

- DEM-340T 4-port copper Gigabit module. This module provides 4
10/100/1000BASE-T ports for 4 copper Gigabit connections.

Fault Tolerant Switch Stacking

Using 2 DEM-540 stacking modules and the 4 built-in 1000BASE-T/
SFP combo ports, the DGS-3312SR Stacking Master can stack up 12
D-Link stackable switches. The stacking scheme uses the star
architecture, where packets are switched directly through the Stacking
Master. This architecture provides for fault tolerance, as any single
broken link between a switch and the Stacking Master will not affect the
rest of the links of the stack. This compares favorably with the ring
architecture, where a fail over link between any 2 switches can break
the link of an entire stack.

Higher Performance Switch Stacking

Instead of a 2Gbps bandwidth shared by the entire stack in a ring
architecture, the DGS-3312SR gives each of the switches on the stack a
dedicated 2Gbps bandwidth from a Stacking Master stacking port. This
brings the total bandwidth up to 24Gbps when 12 switches are stacked
through the Stacking Master.

Scalable Expansion With 288 10/100BASE-TX & 12
Gigabit Ports

By stacking a DGS-3312SR with 12 DES-3226S switches, you
can have as many as 288 10/100BASE-TX ports for departmental
user connection, plus 12 Gigabit ports for server and backbone
attachment. This architecture allows you to easily add switch units
as your need grows, without making changes to your existing
network hardware.

12-Port Collapsed Backbone

If you opt to use your DGS-3312SR as a stand-alone Gigabit
switch, you can install up to 2 Gigabit modules in the expansion
slots. This will give you 8 Gigabit ports, in addition to the 4 built­in 1000BASE-T/combo SFP ports, making it a total of 12 Gigabit
ports. This type of deployment gives you a small collapsed
backbone to which 12 switches and servers can be attached. All
ports on the DGS-3312SR support jumbo frames to alleviate
heavy network traffic. Copper and fiber cables can be deployed,
depending on your selection of the port modules.

Redundant Power Support

The DGS-3312SR can be connected to an external power supply
for redundant power backup purposes. In case the built-in internal
power supply fails, the optional redundant power supply unit will
automatically provide all the required power to ensure continuous
operation.

Wire-speed IP Routing

The switch provides basic IP routing, with instant support for
Windows, Unix and Internet environments. It provides wire-speed
non-blocking switch fabrics with hardware-based packet
filtering/forwarding. Packet routing is performed by on-board
ASICs at speeds many times faster than CPU-based routers.

DGS-3312SR

Product Description

Seamless Integration

The DGS-3312SR can be instantly integrated into any existing
network for seamless integration of Layer 2 and Layer 3 packet
switching. With multi-layer support for every port, you can start with
Layer 2 switching, then upgrade to Layer 3 routing anytime by simply
re-configuring the ports. You can flexibly segment the network into
domains and sub-domains, using (1) subnet IDs and user IP numbers
to route traffic, and (2) custom filters based on users' physical MAC
addresses to filter extraneous traffic. At Layer 2, the switch uses auto­learned and user-defined MAC addresses to discard and forward
packets. At Layer 3, it looks at the user-specified routing table to route
packets to their destinations.

VLANs for Enhanced Security & Performance

The DGS-3312SR supports 802.1Q and port-based VLANs to
improve security and bandwidth utilization. This limits the broadcast
domains and confines intra-group traffic within their segments. The
switch also supports GVRP (GARP VLAN Registration Protocol) for
automatic VLAN configuration distribution.

Advanced Network Access Management

802.1x features enable user authentication for each network access
attempt. Port security features allow you to limit the number of MAC
addresses per port in order to control the number of stations for each
port. Static MAC addresses can be defined for each port to ensure only
registered machines are allowed to access. By enabling both of these
features, you can establish an access mechanism based on user and
machine identities, as well as control the number of access stations.

Multi-Layer Access Control List (ACL)

Access Control Lists (ACL) allow the network administrator to define
policies on network traffic control. The switch supports
comprehensive and multi-layer ACLs, providing a powerful tool for
network management. For example, the switch can be set to block
malicious bulk traffic from specific clients based either on MAC or IP
addresses. Or during a virus attack, the switch can be set to restrict its
flooding based on a virus's unique pattern based on TCP/UDP port
number.

Advanced CoS Support

The switch supports not only Layer 2 802.1p Priority Queue control,
but also a variety of ways to prioritize network packets. Multi-layer
information from L2 to L4 can be used to classify packet priorities.
This function allows you to attach IP telephony devices or video
servers to the switch to run delay-sensitive applications like video
conference. The DGS-3312SR supports up to 8 CoS (Class of Service)
queues in the stand-alone mode, and up to 4 CoS queues in the
Stacking Master mode.

Gigabit L3 Switch

Flexible Transmission Scheduling

The switch supports 2 methods of packet transmission scheduling:
Strict Priority Queuing and Weighted Round-Robin (WRR). You
can select to use Strict Priority Queuing to strictly enforce your
priority queues, or WRR to address bandwidth limitations at peak
time. WRR allows each queue to be assigned a different
percentage of the output port's bandwidth, so that lower-priority
queues are not denied access to buffer space and port bandwidth.

IGMP Snooping for Broadcast Control

The switch listens to IGMP (Internet Group Management
Protocol) messages to build mapping table and associate
forwarding filters. It dynamically configures the switch ports to
forward IP multicast traffic only to those ports associated with
multicast hosts.

Broadcast Storm Control

To prevent too many broadcast/multicast from flooding the
network, broadcast/multicast storm control is configured to screen
excessive traffic. Threshold values are available to control the rate
limit for each port. Packets are discarded if the respective count
exceeds the configured upper threshold in a given time interval.
The possible range of upper threshold is from 0 to 255k packets
per second.

Port Mirroring

This function allows you to mirror adjacent ports for the purpose
of analyzing incoming and outgoing packets where packet
patterns can be studied.

Spanning Tree for Redundant Backup Bridge Path

For mission critical environments with multiple switches
supporting STP, you can configure the stack with a redundant
backup bridge path, so transmission and reception of packets can
be guaranteed in event of any fail-over switch on the network. The
DGS-3312SR supports 802.1D Spanning Tree compatible and

802.1w Rapid Spanning Tree.

Multiple Management Interfaces

SNMP v.1, v.3 network management is supported, using the built­in MIBs. RMON monitoring and SYSLOG are provided for
effective central management. The switch also provides a
Command Line Interface (CLI) and a Web-based GUI. CLI
enables quick system configuration for administrators familiar
with command line operation. The embedded Web-based interface
allows you to easily access the switch from anywhere on the
network and troubleshoot it in real-time. You can, for example,
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.

Features

4 built-in 10/100/1000BASE-T ports
4 built-in combo SFP (mini GBIC) *
2 expansion slots for stacking or Gigabit port module installation
Selection of 4-port 1000BASE-T and SFP modules for expansion
slots
Redundant power supply support
Up to 288 10/100BASE-TX ports and 12 Gigabit ports with 24Gbps
back plane when stacked with DES-3226S switches
Dedicated 2Gbps bandwidth between Stacking Master and each
stackable switch
Jumbo frame support (up to 9,216 bytes)
IP routing supporting RIP-1, RIP-2, OSPF routing protocols,
DVMRP, PIM Dense mode

802.1Q VLAN, GARP/GVRP support

IGMP snooping, 802.1p Priority Queues, port mirroring support
Multi-layer (Layer 2 to Layer 4) ACL and CoS support
Broadcast storm control

802.1D compatible, 802.1w Rapid Spanning Tree for redundant
backup bridge paths
SNMP v.1, v.3 network management, 4 groups of RMON

802.1x port-based/MAC-based access control
Per-port bandwidth control

802.3ad LACP port trunks
Command Line Interface, TFTP firmware upgrade, Web-based
management, Web GUI Traffic Monitoring support
SNMP management/MIB support

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