Thursday, January 31, 2008 

Cisco CCNP Certification / BSCI Exam Tutorial: Comparing IRDP And HSRP

To pass the BSCI exam, you need to know the difference between IRDP and HSRP. While they have the same basic function, the operation and configuration of each are totally different.

The aim of both is to allow hosts to quickly discover a standby router when the primary router fails. IRDP is commonly used by Windows DHCP clients and several Unix variations, but you do see it in Cisco routers as well. IRDP is defined in RFC 1256.

IRDP routers will multicast Hello messages that host devices hear. If a host hears from more than one IRDP router, it will choose one as its primary and will start using the other router if the primary it's chosen goes down.

HSRP is a Cisco-proprietary protocol that is designed for quick cutover to a secondary router if the primary fails, but the host devices don't "see" either the primary or secondary router. The hosts use a virtual router as their default gateway. This virtual router has its own IP and mac address! All the while, the router chosen as the primary is actually the one doing the routing. If the primary router goes down, the secondary router quickly takes over with no major interruption to network services.

The HSRP routers communicate by multicasting updates to 224.0.0.2, and its through these hellos that the HSRP routers decide which router is primary and which is secondary. HSRP is defined in RFC 2281.

The configuration of each of these will be covered in a future tutorial. In the meantime, I urge you to read the RFCs mentioned in this article, and visit www.cisco.com/univercd to read about the configurations and options available for both of these vital protocols.

Books On Sivananda Yoga

 

Why Does the Western Public Desire Pilates?

As a Yoga teacher, and a Pilates instructor, it is very noticeable that Pilates and Yoga reach two distinctly different groups of people. The typical Pilates student does not want to learn about meditation, pranayama, Sanskrit, bandhas, mudras, or doshas. In the mind of a Pilates enthusiast, all of these Yogic aspects are considered secondary to the physical workout.

In a Pilates mat class, the emphasis is on precise movement, to gain maximum benefits and results, for physical appearance. Although Yoga and Pilates are often categorized as mind and body exercise, Pilates focus is much more about the physical body than Hatha Yogas holistic approach to overall health.

Hatha Yoga, which is union through physical mastery, is a complete health maintenance system for mind, body, and spirit. Pilates is an off shoot of Hatha Yoga, but it is a unique, complex, and extremely complete exercise system.

Therefore, most forms of Hatha Yoga are not simply exercise classes. A complete health maintenance system, such as Hatha Yoga, took thousands of years to develop and evolve. The Pilates method is close to a century old, but it has already started to evolve in its own different directions.

So, which is better Yoga or Pilates? Neither - The truth is, the student makes an individual choice, based upon his or her specific needs. Many Yoga students enjoy the holistic approach, which Yoga takes toward health, but for some students, japa (repetition of mantras), or meditation, may feel very uncomfortable.

Lets look at this situation closely. Some people feel uncomfortable because japa is commonly practiced in Sanskrit, and they do not comprehend the words.

Swami Sivananda said, Repetition of any Mantra or name of the Lord is known as japa. japa is an important Anga of Yoga. It is a spiritual food for the hungry soul.

japa is a spiritual aspect of Hatha Yoga. japa is commonly practiced in bhakti Yoga, which is deeply spiritual and the most popular form of Yoga in India.

Some Yoga students would rather not sing, chant, or pray out loud. Some people do not trust anything or anyone who is spiritual. Unfortunately, there have been a number of holy men who have violated the publics trust.

In the United States, anything spiritual has become politically incorrect. There is a movement to take, In God we Trust off US currency. The irony of this is, a few loud voices have caused the public to be hesitant about anything that could be considered remotely religious.

Hence, the Pilates instructor only has to focus on precise physical techniques and making sure students experience the physical health benefits of the Pilates Method.

Copyright 2006 paul Jerard / Aura Publications

paul Jerard, E-RYT 500, is a co-owner and the director of Yoga teacher training at: Aura Wellness Center, in Attleboro, MA. http://www.riyoga.com He is a Pilates Instructor and has been a certified Master Yoga teacher since 1995. To receive a Free e-Book: "Yoga in Practice," and a Free Yoga Newsletter, please visit: http://www.yoga-teacher-training.org/index.html

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