Multi-layer switching technology: the analysis of multiple switching

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					Multi-layer switching technology: analysis of multiple switching
           Multi-layer switching technology: the analysis of multiple switching
Multi-layer switching technology: the analysis of multiple switching
【Network Communications Network Communications Institute】 suit the real needs
of
Like a revolution, the Internet application has swept the modern society, the Internet
has further spread, however. The amount of information presented with the massive
growth in business volume, while the rapid and large optical network technology to
enhance network capacity, the bandwidth of up to become abundant. Therefore, how
to make full use of bandwidth resources on the Internet applications, content
management, service providers increasingly become the focus of attention. In the case
of Gigabit bandwidth applications, the network layer is no longer a problem the
following key and replace it with improved network services, complete Internet
access to intelligent changes. To do this, how to solve the transport layer to
application layer problem (that is, they also identify the network), Zhuanmenzhendui
transport layer to application layer management of the network Jishu become very
important, it is 目前 Duocengjiaohuan technology Fazhan the most fundamental
reason .
The so-called content recognition network is the transport layer to application layer
for the network management. Solved through the layer of each packet on each
package, and identify the most profound information to realize the function of the
content identification. To solve the distinction between applications, dynamic
allocation of resources and user billing issues, identification of equipment distribution
business with a network flow is a good way. In the early days, when the equipment
manufacturers began to pay attention to this problem, proposed solution is achieved
through special software to identify the contents of function, but the market did not
meet expected results. The key problem is that the information needed to complete the
function buried deep within the packet, it only occurs in the network when a session is
established. This requires software-based content identification devices to spy on each
session within each packet, the result has caused a serious delay and performance
deterioration, congestion is inevitable.
Subsequently, all with the hardware implementation of multilayer switching
technology began to appear in the market. Remove the complex software, and
network processors, general-purpose CPU, through the application of the switch to
achieve all of the network function, maximize the use of network resources, so that
the performance of server-based data center to achieve other possible applications.
Meanwhile, the multi-layer switches, switching to applications placed in the core
layer or distribution layer, rather than close to the lower of the server, so network
managers can lower costs and better allocation of network resources possible. This
solution enables service providers and enterprise users can without sacrificing
wire-speed Gigabit performance, and free to set up Web applications and services
required by any rules.
Technical progress
Switching from the traditional three-to four-or seven technology exchange, providing
application-level network-based configuration tool. Layer three switching products
with the LAN and the Internet in addressing the issue of bandwidth and capacity to
play a good role, but end to end performance and QOS require all network devices for
load balancing to ensure that the client and server smooth flow of data between. These
needs four exchange.
Four switching technology using the third layer and fourth layer header information to
identify the application data stream session. Standards in the OSI model, the fourth
layer protocol commonly used are TCP, UDP, etc., these protocols carries a different
business, and that these types of business agreements and then by the TCP port
address to determine the UPD. Therefore, through this information, including TCP /
UDP port number, marking the beginning and end of the application session
"SYN / FIN" bit, and IP source / destination address recognition,
four forward exchange where the conversation can be made to the transport stream of
intelligence decision. To use a variety of different systems to support an application of
大型 enterprise data Zhongxin, Internet ISP or Neirong Ti Gongshang, 以及 Shang
many servers for replication function is on, four Jiaohuan role is key.
As with the business information, therefore, the fourth layer exchange can bring smart
business. Four switching functions in addition to load balancing also supports other
functions, such as multi 级 queuing techniques, the fourth Ceng switch Keyigenju
Ying Yong Lai Biaojichuanshu Liu, and for the transport stream Fenpeiyouxian level.
Based on application type and user ID of the transport stream control. In addition, the
four switches placed directly on the server front, it is about application of the session
content and user rights, thus prevent unauthorized access to make it the ideal server
platform.
Exchange in the fourth layer significantly improves network performance and QoS
guarantees based on a higher level, we can introduce the concept of exchange, which
is the seventh switching technology, or called high-level intelligence. It can be defined
as the transmission of data packets not only based on MAC address (the second tier
exchange) or source / destination IP address (the third layer switching), and TCP /
UDP port (fourth level exchange), and can be based on content (that layer and
application layer) for transmission. Packets through the spin-off, the seventh floor of
the exchange can transport stream content, to all the transport stream and further
control the content. This guarantees that the different types of transport stream can be
assigned different priorities. Understanding with the seventh layer is not dependent on
the routing device used to identify differences in equipment or services
(Different-Services). Common Open Policy Service Agreement or other quality of
service transport stream, transport stream it can be filtered and assigned priority.
Seventh layer switching can achieve effective data flow optimization and intelligent
load balancing.
Wide range of business applications
Multi-layer switching technology, in the current environment, mainly the Internet and
data centers, more mature products are mostly Internet services of the Web switch.
The application of a multi-layer switching device in the network has a relatively
traditional content management the power switch. The Internet, corporate intranet,
extranet, multilayer switches are applied.
Internet - business to consumer e-commerce, online customer support; server load
balancing; user prioritization and control; adaptive redundant operations - state
recovery; electronic transaction processing guarantees; gigabytes of bandwidth
management and rate .
Intranet - personnel planning and construction, marketing automation, customer
services; firewall load balancing; best server flux orientation; move request
processing; content and transaction processing priority order and the use of Web site
content cache to accelerate supply.
Extranet - electronic commerce business to business, supply chain automation, sales /
service channel interaction; global server load balancing; access control; advanced
traffic management for e-commerce; content filtering and bandwidth management.
In all these applications, multi-layer switching technology for not only
today's needs, more importantly, to meet the future needs to establish a
distributed and scalable architecture. This requires multi-layer switching with the
following features: a new standard of high availability, improve security through SSL
integration and performance, local and global load balancing, site and system security
through a simple GUI tool or senior management. Predictable, in the stimulation of
market demand, technological advances will promote the multi-layer switching to a
deeper level.
Market, product diversification
Although the concept of multi-layer switching technology has been made in a few
years ago, but the actual application of the products in the market in 2001. In the
current market, CISCO, NORTEL, EXTREME, CABLETRON, AVAYA and domestic
networks are multi-layer switching products Harbour.
CISCO has developed a CSS 11000 Series Content Services Switch and the CSS
11500 series content services switches. The former works in layer 5 to 7 layers, and
cache array for the server to provide a robust set of front-end. Has a unique
e-commerce, Web content collection and forwarding features, end to end Cisco
network solution content an important part. The latter is a compact, modular platform
for e-business applications can provide the most extensive set of Layer 4-7 traffic
management services to the Internet and intranet data centers that power transmission
and application (Layer 4-7 ) services.
Nortel Passport 8600 2-7 layer switching platform through the built-in fail-safe and
redundant equipment can handle up to 4 million concurrent sessions. Yao Tang will
exchange module integrated into the company Web Passport 8600 product series, as
part of this innovation to enhance the exchange of the fourth to the seventh layer of
intelligence. It can also support other advanced processing capabilities, including:
server load balancing; global load balancing; streaming media server load balancing;
Web buffer re-orientation; firewall load balancing; virtual private network load
balancing; intrusion detection, server load balancing; WAP Gateway Server load
balancing; content filtering; gigabyte rate bandwidth management.
Extreme's SummitPx1 application switch. SummitPx1 application switch
supports a full complement of first Layer 7 application switching capabilities, which
includes parsing the Web page the ability to request, and in accordance with the
requested content and server capacity to the most Geshi the web server to redirect the
ability to connect.
   China's Harbour Networks launched FlexHammer5000 Series hardware
support for Layer 2 switch to Layer 7 switching, switches, each port has a separate
packet filters can solve the first 80 bytes of the packet of information, intelligence
distinguish different application flows such as DNS packets can be identified in the
WWW address information. FlexHammer5000 series switches can be based on the
physical switch port, VLAN ID, MAC address, source or destination IP address,
source or destination TCP / UDP port number and application protocol data packets
and other information to be bandwidth control, bandwidth control with granularity of
minimum 64K .
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Tags: Multi-Layer Switch
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Source: Network News Network Training Center of Hebei www.netdigdu

				
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