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Stackable 4-Port Switch + combo Gig copper /SFP + 2 slots for 8 port expansion

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 auto-learned 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 elay-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.

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 built-in 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.

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