Network technologies and trends


September 14, 2009  7:56 AM

R & M brings revolution by launching the new product Cat. 6A – Copper Cabling for High-Performance Data Networks

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

Yesterday I received an email from the Area Manager Mohammed Fazal, of the leading Swiss cabling specialist, Reichle & De-Massari. According to his email R & M unveiled a major breakthrough in copper cabling, a new RJ45 connection module which meets the Cat. 6A standard as specified by ISO/IEC had been launched.

 

Jean Pierre Labry, managing director of R&M Middle East & Africa, said: “Cat 6A is the key to new maximum performance and greater operating reliability in data networks.”

 

He also added that the new devices allow companies to boost their network’s bandwidth and transmission quality without having to abandon the reasonably-priced and reliable RJ45 connector standard.

 

 

 

 

In a recently held Ineltec conference in Basel R & M unveiled the high speed RJ45 connection module.

 

The R & M development lab has discovered a new way of shielding individual twisted pairs from electromagnetic interference and the company claims the new devices will be suitable for transmission of data at speeds greater than 10Gbps.

Also check the press release from R & M.

The new research sponsored by Brockade and Eaton suggests still data centers are being driven by performance issues.

September 14, 2009  7:50 AM

According industry group’s latest report, Data centre’s cooled too much!

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

 

According to the new study done tje by leading industry group, almost all Data Centers are cooled to a temperature lower than the required temperature for the normal operation of a Data Center.

 

 

The group comprised of representatives Intel, IBM, Liebert, HP and the Lawrence Berkeley National Lab, found almost all Data Centers in a survey of the US Data Center Users Group were cooled much below temperature than the recommended temperature of 27°C.

 

The recommended temperature for the Data Centers of 27°C was proposed by American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE).

 

The study also estimates the potential energy savings that could be achieved if data centres could be operated closer to the recommended limit as being as high as 90% energy savings for CRAHs.

 

The report can be downloaded here.


September 12, 2009  7:34 AM

How to capture a text using PuTTY client?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

 

PuTTY doesn’t need any introduction as its one of the widely used for remote console utility. PuTTY is an SSH and telnet client.

In day to day operational activities we do telnet or SSH to our Cisco routers or Switches, at times we need to backup a running or startup config or   a Cisco router or a switch or even some times we need to capture the terminal session logs for technical information etc.  This is can be easily done by using the PuTTY client.

I will show you how to capture a text using PuTTY client.

Once you have established a remote session with a Cisco router or a Switch, follow the following steps

 

Step 1: Right Click on the menu bar and select “Change Settings”

 

Step 2: Click logging under the icon Session.

 

Step 3: Then select “All Session Output”.

 

Step 4: Select the location using the browse button and enter the desired file name and click apply.

 

These steps will create the log file in the specified location and it will log everything you did in that particular telnet or SSH session.


September 8, 2009  9:45 AM

Remote Telnet useful tips!

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

 

We all work remotely with Cisco routers and Switches, we often do login to do some configuration changes in the Cisco routers and Switches. What if we configured wrongly in the live Cisco routers and Switches which are located in the remote sites, we don’t enjoy the liberty of resetting the devices unless we have control over the power distribution.

 

In this scenario the “reload” command proves to be very handy and useful. Just before making any changes to the configuration we can use the “reload” command as demonstrated below

 

ITKE-Cisco#reload in ?

Delay before reload (mmm or hhh:mm)

 

ITKE-Cisco#reload in 10

 

System configuration has been modified. Save? [yes/no]: no

Building configuration…

[OK]

Reload scheduled in 10 minutes by yasir on vty0 (10.0.0.5)

Proceed with reload? [confirm]

ITKE-Cisco#

ITKE-Cisco#

 

 

***

*** — SHUTDOWN in 0:05:00 —

***

 

The above demonstrated command will reload the device in 10 minutes. After applying the “reload” command we can proceed with the configuration changes. If things go wrong and we lost connectivity

to the device, then try back after 10 minutes as the device will get reloaded with the original startup-configuration which can helps us to restore the connectivity to the device.

 

Once we are sure about the new configuration and its working properly without any hassles there is always a way  “reload cancel” command is there to cancel the reload.

 

ITKE-Cisco#reload cancel

 

I find this command to be very handy and useful especially when we have to telnet or SSH to remote Cisco router or a Switch.


September 5, 2009  8:32 PM

Review for Interconnecting Data Centers Using VPLS

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

 

Interconnecting Data Centers Using VPLS is a book which aims at providing solutions that provide a high speed, low latency network and spanning tree protocol (STP) isolation between data centers based on Virtual Private LAN Service (VPLS).

Pic Courtesy: Cisco Press

The book makes interesting reading, especially as it covers in detail about the architecture design and configuration required to interconnect data centers as well as case studies to interconnect Data Centers.  This book is targeted to Systems professionals and System engineers who are into designing solutions for interconnecting data centers which ensures high availability Layer 2 connectivity and STP isolation.

The authors Nash Darukhanawalla and Patrice Bellagamba started the book with explaining the need for high availability of the Data Centers, explaining the concept of the high availability clusters, introduction to Virtual Private LAN Service (VPLS), MPLS traffic engineering.

The authors’ present different flavors of data center interconnect solution using different combination of Spanning Tree modes, VLAN mapping as well other criteria’s along with complete configuration required at the  aggregation switches and provider edge routers.

The book is divided into 13 chapters, and it also deals with issues related to layer 2 bridging domains and provides guidance to extend VLANs using Virtual Private LAN Service (VPLS). This book contains lot of reference network diagrams which can help the readers to understand the presented solutions in normal mode as well as in failover mode.

I found this book extremely readable and enjoyable and I would recommend this book to the folks who are interested in knowing more about the Virtual Private LAN Service (VPLS). The book comes with lot of useful information which will definitely help the readers to get familiar with the Virtual Private LAN Service (VPLS) concepts and configuration steps required for interconnecting data centers.


September 5, 2009  8:07 AM

Review for CCNP BCMSN Official Exam Certification Guide (4th Edition)

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

 

Hi folks, as I received a CCNP Official Certification Library, fifth edition thanks to Cisco Press (Jamie) for the great support lending on me all the time. To brief about the CCNP Official Certification Library, fifth edition is a comprehensive package for the four Cisco CCNP exams BCMSN, BSCI, ISCW and ONT. Starting from this post I will try my best review all the four Certification books comes with the CCNP Official Certification Library, fifth edition thanks. To start with I will go with the CCNP BCMSN Official Exam Certification Guide, fourth edition.

The CCNP BCMSN Official Exam Certification Guide, fourth edition is a true guide for preparing for the Cisco BCMSN (642-812) exam. The author David Hucaby did a wonderful job by the explaining the material in short concise way that facilitates easy learning.

The CCNP BCMSN Official Exam Certification Guide, fourth edition is divided into six parts , each part is well written and  more over its easy to understand. The most liked chapter for me is the Router, Supervisor and Power redundancy. Thanks to David Hucaby, I was able to migrate our network from HSRP to GBLP succefully. He explained the concept very well like I said it’s really easy to understand.

The CCNP BCMSN Official Exam Certification Guide, fourth edition does have the Scenarios for final preparations  There are nine scenarios covering wide range of concepts and are helpful not only from the exam point of view but also it can be used to troubleshoot the problems in real networks faced by some folks.

One more amazing thing I liked in the CCNP BCMSN Official Exam Certification Guide, fourth edition is the practice exams which are handful for the folks who has little exposure to real world networks, but it’s always recommend to have some hands on experience with Switches configuration and analysis.

Overall an excellent guide which can leads you to taste the success of passing Cisco BCMSN (642-812) exam. I would rate this guide 4.5 out of 5.


August 29, 2009  7:13 AM

Building a Green Data Center? Then Join hands with Douglas Alger on September 24, 2009

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

Building a Green Data Center?  Then Join hands with Douglas Alger on September 24, 2009

Safari Online is conducting a Webcast Series on the topic “Grow a Green Data Center” with Douglas Alger the author of the book “Grow a Green Data Center” on September 24, 2009. 

 Register now and by attending the Webcast you are eligible to win free 45 DAYS OF COMPLIMENTARY ACCESS to Grow a Greener Data Center. Even The first 10 people to register for the webcast will receive a FREE AUTOGRAPHED COPY of Grow a Greener Data Center. You must attend in order to win.

The Event information is as follows

Date and time:

Thursday, September 24, 2009 9:00 am
Pacific Daylight Time (San Francisco, GMT-07:00)
Change time zone

 

Thursday, September 24, 2009 12:00 pm
Eastern Daylight Time (New York, GMT-04:00)

Program:

Safari Books Online Webcast Series

Duration:

1 hour 15 minutes

Description:

Data centers have historically had a huge environmental impact — consuming massive amounts of power, emitting pollutants, and discarding huge amounts of machine waste. Companies are increasingly objecting to the financial and public relations costs they are paying for environmentally insensitive data centers. Fortunately, it’s now both possible and cost-effective to run a “green data center.” In this one hour webcast, author Doug Alger makes the business case for greening data centers, and presents technologies, design strategies and operational approaches that can help any company improve the energy efficiency and “eco-friendliness” of their IT facilities. He walks step-by-step through “greening” physical construction, power, cooling, and servers; then covers equipment consolidation, virtualization, and much more.

 

 


August 26, 2009  7:46 AM

Pre-Order the Cisco Product Quick Reference Guide

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

 

Coming September 14th 2009 you can pre-order the September 2009 edition of the Cisco Product Quick Reference Guide. This guide presents an overview of Cisco products, services and solutions for every part of your business. It meets information needs for companies of all sizes.

The portable and easy-to-use reference tool includes brief product overviews, important features, technical specifications, part numbers, and ordering information for many of Cisco products and services. It’s designed to help our partners, resellers, distributors, and sales account teams quickly learn about and sell Cisco products, services and solutions that are right for their customers. It’s also ideal for end users, networking professionals, Cisco Networking Academy members, and those studying for Cisco certification who need a broad, high- level overview.

You can pre order just by visiting the Cisco Product Quick Reference Guide website at www.cisco.com/go/guide and click on the Ordering link.


August 22, 2009  8:46 AM

Configuring Multiple SSIDs in Cisco 1250 Access Points Series 6

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

In this post I will just post the snap shots for SSIDS ADMIN and GUEST, where you can see the SSIDS are connected, they got an IP address and they can ping the default gateway as well. It’s just to confirm  connectivity.

ADMIN SSID Connectivity

The PC is getting an IP from the DHCP Server for the SSID ADMIN  and VLAN 101

The PC can ping the default gateway

GUEST SSID Connectivity

The PC is getting an IP from the DHCP Server for the SSID GUEST and VLAN 102

 The PC can ping the default gateway

So with this I will conclude this series. If any body have any comments please do comment.


August 18, 2009  7:47 AM

Configuring Multiple SSIDs in Cisco 1250 Access Points Series 5

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

 

Dear all lets proceed further with the configuration of the Cisco Catalyst 3560 Switch

 

Configure the Cisco Catalyst 3560 Switch.

 

In this step we will configure the Cisco Catalyst 3560 Switch port which is connected to the Cisco Aironet 1250 Series Access Point to the wired network. We will configure the Cisco Catalyst 3560 Switch port, which is connected to the Cisco Aironet 1250 Series Access Point as trunk port because this port will carries traffic for all the VLANs on the wired network. In our case the VLANs are VLAN 101, 102 and the native VLAN 100.

When you configure the Cisco Catalyst 3560, which connects to the Cisco Aironet 1250 Series Access Point ,ensure that the native VLANs that you configure match the native VLAN on the Cisco Aironet 1250 Series Access Point. Otherwise, frames are dropped. In order to configure the trunk port on the Cisco Catalyst 3560 Switch, use the following commands from the CLI on the Cisco Catalyst 3560 switch:

Note: In our scenario the Cisco Aironet 1250 Series Access Point is connected to a Cisco Catalyst 3560 Switch to the port number Giga Ethernet 0/20

ITKE-Cisco(config)#interface interface gigabitEthernet 0/20

ITKE-Cisco(config-if)# switchport mode trunk

ITKE-Cisco(config-if)#switchport trunk encapsulation dot1q

ITKE-Cisco(config-if)#switchport trunk native vlan 100

ITKE-Cisco(config-if)#switchport trunk allowed vlan 101,102

ITKE-Cisco(config-if)#switchport nonegotiate

ITKE-Cisco(config-if)#

 

(The above commands configures the Giga Ethernet port 0/20  as trunk port, with a dot1q encapsulation , with VLAN 100 as a native trunk VLAN ).

 

Note: Cisco IOS Software-based Aironet wireless equipment does not support Dynamic Trunking Protocol (DTP). Therefore, the Cisco Catalyst 3560 must not try to negotiate DTP.

With this configuration we have successfully completed the configuration of multiple SSIDs in the Cisco Aironet 1250 Series Access Point . In the coming post I will post the snap shots for the connection established to SSIDS ADMIN and GUEST. Basically we will test the connectivity with the ping command.

 

 


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