Saturday, 19 September 2015

Application Delivery Controller | ADC |

Welcome Back blogger.......I would like to talk about ADC. what is ADC. how it's Works. Why need ADC, who needs ADC, how good with ADC, How good without ADC and etc ... just ask...we discuss.

Technology moving faster and faster and faster without we know the technology we know today is a latest technology or not. How long the technology can sustain in certain environment. We invest a lot of money on technology but sometime it's become useless or not utilize. Today all people talk about technology, internet, cloud, virtual, software define any and etc....

What is ADC : - An application delivery controller is a computer network device in a data-center, often part of an application delivery network ( ADN ), that helps perform common tasks such as those done by web sites to remove load from the web servers themselves. Many also provide load balancing.

Credit to https://en.wikipedia.org/wiki/Application_delivery_controller

So in high level understanding, this ADC works as middle man between client to origin server. This technology can help the traffic from the client to origin server work on balancing mode to get the performance, availability and connectivity to fulfill the user experience efficiency and give smile face.... :)   . ||| GOOD TO HAVE THIS TECHNOLOGY |||

What is the challenges for the IT decision maker ??... What brand / model need to purchase.

Today's a lot of IT vendor in the market want to sell this technology. IT people must know what is their capacity, needed or work load of their application. Some assessment need to be done on their level in proper manner to get the sizing of the ADC capacity and model. After know the sizing, then brand will be in placed to choose. The important is, the brand must be reliable in their region or country for easy future support. IT people must  know , what is the market share for each brand in their country.

Refer To Gartner Report






More understanding on ADC. Read below article

Tomsitpro
CITRIX
prnewswire



IT CAN HELP YOUR BUSINESS BOOMMMMM. But With correct implementation. Stay Tech...Stay Healthy...Stay Calm.


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Monday, 24 March 2014

CISCO : What You Make Possible

Troubleshooting Link Issues in various CISCO switch



Network Administrator or network engineer will facing with the link issues. This blog will give you direction or how to troubleshoot with using the right command or possible command to tackle the issue.

Link Issue : Port Status and Counters

2900#sh int gig 1/0/1  ( this command will show you the port/interface status.)

GigabitEthernet1/0/1 is down, line protocol is down (notconnect)
Hardware is Gigabit Ethernet, address is 70ca.9b2d.9f81 (bia 70ca.9b2d.9f81)
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Auto-duplex, Auto-speed, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec




Understand OSI Layer & TCP/IP Protocol

What is OSI Layer (The Open Systems Interconnection model) : 

Conceptual model that characterizes and standardizes the internal functions of a communication system by partitioning it into abstraction layers. The model is a product of the Open Systems Interconnection project at the International Organization for Standardization (ISO), maintained by the identification ISO/IEC 7498-1.

Its seven-layered approach to data transmission divides the many operations up into specific related groups of actions at each layer.

OSI Model




             Wikipedia-OSI Model


Each OSI layer have a specific protocol or task for doing the communication is called TCP/IP

What  is TCP/IP ( Transmission Control Protocol (TCP) and the Internet Protocol (IP) ) :

The Internet protocol suite is the networking model and a set of communications protocols used for the Internet and similar networks. It is commonly known as TCP/IP, because its most important protocols, the Transmission Control Protocol (TCP) and the Internet Protocol (IP), were the first networking protocols defined in this standard. It is occasionally known as the DoD model, because the development of the networking model was funded by DARPA, an agency of the United States Department of Defense.
TCP/IP provides end-to-end connectivity specifying how data should be formatted, addressed, transmitted, routed and received at the destination. This functionality has been organized into four abstraction layers which are used to sort all related protocols according to the scope of networking involved.[1][2] From lowest to highest, the layers are the link layer, containing communication technologies for a single network segment (link), the internet layer, connecting independent networks, thus establishing internetworking, the transport layer handling process-to-process communication, and the application layer, which interfaces to the user and provides support services.

TCP/IP Model




OSI vs TCP/IP





Source : tcpipguide-TCP/IP model
              coffeeshop.macinfotechnologies-TCP/IP model
             electronicdesign.com-Difference-between-osi-seven-layer-network-model-and-tcpip
             vlsm-calc.net-OSI&TCP/IPmodels

Sunday, 23 March 2014

Clos Network : When old become Favorite

Clos Network History :

Created in the mid-1950s as a method to switch telephone calls. Multistage circuit switching network, first formalized by Charles Clos in 1952.  Charles Clos was a researcher at Bell Laboratories in the 1950s. He published a paper titled "A Study of Non-blocking Switching Networks" in the Bell System Technical Journal in 1953.

Source 1 : Clos Network-Wikipedia
Source 2 : Clos Network-NetwrokWorld


Example Clos Design :