8-port Gigabit Ethernet Switch User’s Guide
3
installed. Many network segments display poor performance, but the Ethernet wire is only carrying a fraction of its total
traffic capacity. The problem is not the network, but the ability of the connected devices to utilize the full capacity of the
network. The DGS-3308 can eliminate network bottlenecks to high-traffic areas, and improve the utilization of the
network’s installed bandwidth.
The Functions of a Layer 3 Switch
Traditional routers, once the core components of large networks, became an obstacle to the migration toward next-
generation networks. Attempts to make software-based routers forward packets more quickly were inadequate.
A layer 3 switch does everything to a packet that a traditional router does:
•
Determines forwarding path based on Layer 3 information
•
Validates the integrity of the Layer 3 header via checksum
•
Verifies packet expiration and updates accordingly
•
Processes and responds to any optional information
•
Updates forwarding statistics in the Management Information Base
•
Applies security controls
A Layer 3 switch can be placed anywhere within a network core or backbone, easily and cost-effectively replacing the
traditional collapsed backbone router. The DGS-3308 Layer 3 switch communicates with a WAN router using a standard
Gigabit Ethernet or GBIC-based port. Multiple DGS-3308 switches can be linked via the Gigabit Ethernet ports.
Features
The DGS-3308 was designed for easy installation and high performance in an environment where traffic on the network
and the number of users increase continuously.
Switch features include:
Ports
•
Six 1000BASE-SX (SC-type fiber transceiver) for the DGS-3308FG or six 1000BASE-T (10/100/1000M
Fast/Gigabit Ethernet) for the DGS-3308TG.
•
Two GBIC-based Gigabit Ethernet ports.
•
Fully compliant with IEEE 802.3z.
•
Fully compliant with IEEE 802.3 10BASE-T, IEEE 802.3u 100BASE-TX, and IEEE 802.3ab 1000BASE-T (DGS-
3308TG only).
•
Support Full Duplex operations.
•
Supports auto-negotiation for 10M/100M/1000M speed (DGS-3308TG only).
•
IEEE 802.3x compliant Flow Control support for full duplex.
•
Supports Head of Line Blocking.
Summary of Contents for DGS-3308 Series
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