D-Link DGS-6600 Series Specifications download pdf (Page 15)

Switches by location

Switches for the

core network

The core network is where mission-

critical resources, such as application

servers and storage systems, are

connected. It’s also where Internet and

other wide area networking gateways

are located, to both connect local

users to the outside world and allow

remote access to network resources

from branch oces and by teleworkers

and mobile users. Network and security

management and systems will also be

connected directly to the core network.

Because of this critical role, a high

performance and reliable switching

infrastructure is required. This will

be made up of fully Managed Layer

3 Switches, typically although not

exclusively, chassis based. Redundant

power is a must at this level, along

with a high capacity switching

fabric and support for multiple

high-bandwidth links to the servers,

gateways and other shared devices

connected to the core network.

10GbE interfaces are becoming

commonplace here, both for connecting

these resources to the network and to

provide high-speed downlinks to the

aggregation/access networks.

Key selling points:

Highly scalable chassis or modular

stacking architecture; easy to add

support for networking technologies

other than Ethernet; full management;

support for Layer 3 switching and above

Look for:

Chassis-based Managed Switches; fast

backplanes; hot-swapping of switch

modules; high levels of redundancy;

10GbE and faster; Layer 3 routing

capabilities; wireless integration; support

for bre channel and other technologies

in the same chassis; security options.

Where are they used?

Core network switches are deployed

in medium to large companies and

are mainly found in secure datacentres

alongside the servers, storage and

WAN gateways to which they connect.

Data and storage consolidation

Until recently, most enterprises kept their data and storage networks apart,

using Ethernet switches to carry data trac and Fibre Channel to build

separate Storage Area Networks (SAN) to connect storage arrays to their

host servers. In the past few years, however, the trend has been towards

consolidation using iSCSI and, more recently FCoE (Fibre Channel over

Ethernet) to enable SAN trac to be carried across an Ethernet infrastructure.

Standard Ethernet switches can be used to build an iSCSI/FCoE SAN, but

most companies opt for a separate infrastructure to accommodate the

dierent needs and priorities of storage and general data trac.

Even faster

Ethernet

Ethernet networks just keep

on getting faster with most

desktop PCs and servers

equipped with built-in

Gigabit Ethernet interfaces

and switches with Gigabit

interfaces readily available to

match. Technology, however,

marches on and 10Gbps

Ethernet (10GbE) has been

available for a couple of

years, mostly on servers and

to provide high-bandwidth

uplinks between switches.

And there’s more to come,

with 40GbE and 100GbE

switches and adapters already

appearing on the market.

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D-Link DGS-6600 Series Specifications Page 15

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