Cisco CCNP Certification: BGP Attribute Category Tutorial
by: Chris Bryant, CCIE #12933
You have to master the details on BGP to pass the BSCI exam and to earn your CCNP, but BGP is an entirely new world from the protocols you studied to earn your CCNA. BGP paths contain attributes, while no protocol you studied for the CCNA carried. BGP Attributes are used to choose the best path when multiple loop-free paths exist, as well as give you other specific information about the paths. This additional information includes the autonomous systems that are along the path to a given destination, what the next-hop IP address is, and much more.
Before we examine the specific attributes, we need to understand the categories used to differentiate BGP attributes. Some attributes are required, some aren't; some attributes will be carried between routers, where others will not.
The first category is the well-known mandatory attribute. As you'd expect, these attributes are required and will be understood by all BGP speakers. Mandatory attributes include the origin code, AS_Path, and next-hop.
Well-known discretionary attributes don't have to be present, but if they are , all BGP speakers will understand their meaning. BGP attributes that fall into this category are the MED, local preference, and atomic aggregate.
Optional transitive attributes may not be fully understood by all BGP speakers, but the attributes are sent between routers as paths are exchanged. The aggregator and community attributes fall into this category.
Finally, we have the optional nontransitive attribute. If a BGP speaker does not understand this attribute, the speaker will not forward the attribute. The Originator ID and Cluster ID are optional nontransitive attributes.
There's one important BGP attribute that was left out of this list; indeed, if you're working in an all-Cisco environment, it may be the most important attribute of all. The weight attribute is Cisco-proprietary, so if you're working in a multivendor environment, this attribute is of limited value. However, the weight attribute is the first attribute considered when BGP is deciding between valid, loop-free paths, so it's an attribute we have to keep in mind. The weight attribute doesn't really fit in any of the four BGP classes we talked about earlier in the article.
If you don't know what these attributes do yet, that's okay. We'll examine each of these attributes in more detail in the next part of this free BGP tutorial. Keep studying!
About The Author
Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage (www.thebryantadvantage.com), home of free CCNA and CCNP tutorials, The Ultimate CCNA Study Package, and Ultimate CCNP Study Packages. For a FREE copy of his latest e-books, ?How To Pass The CCNA? and ?How To Pass The CCNP?, visit the website and download your free copies!
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The History of Voice over Internet Protocol
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by: Van Theodorou
The History of Voice over Internet Protocol By the end of 2006,
Voice over Internet Protocol (VOIP) may account for as much as
25 - 40% of international voice traffic. This prediction is
impressive, but it is even more amazing when you consider the
relatively short history of voice over internet protocol. It
began as a hobby for some people in Israel who were only able to
communicate by computer.
Later that year, in 1995, the first company in the history of
voice over internet protocol to put a product on the market was
Vocaltec. They released Internet Phone Software, which in
combination with a home computer, sound card, speakers,
microphone and modem allowed users to make a phone call over the
internet. However, the people on both ends had to have the same
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The History of Voice over Internet Protocol
Speakers > The History of Voice over Internet Protocol
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by: Timothy Crawford
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Motivational Speaker Stereotype Number One:
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The "Over-The-Top" Speaker or the O.T.T. Speaker appears to have discovered a new fad diet which includes mountains of pure sugar and caffeine. The O.T.T. will at any given moment find it necessary to...
The 3 Deadly Sins of Motivational Speakers And How To Avoid Them
Speakers > The 3 Deadly Sins of Motivational Speakers And How To Avoid Them
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Is There Any Way Out Of This Mess?
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Cisco CCNP Certification: BGP Attribute Category Tutorial
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by: Chris Bryant, CCIE #12933
You have to master the details on BGP to pass the BSCI exam and to earn your CCNP, but BGP is an entirely new world from the protocols you studied to earn your CCNA. BGP paths contain attributes, while no protocol you studied for the CCNA carried. BGP Attributes are used to choose the best path when multiple loop-free paths exist, as well as give you other specific information about the paths. This additional information includes the autonomous systems that are along the path to a given destination, what the next-hop IP address is, and much more.
Before we examine the specific attributes, we need to understand the categories used to differentiate BGP attributes. Some attributes are required, some aren't; some attributes will be carried between routers, where others will not.
The first category is the well-known mandatory attribute. As you'd expect...
Cisco CCNP Certification: BGP Attribute Category Tutorial
Speakers > Cisco CCNP Certification: BGP Attribute Category Tutorial
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Tips For Using Video & Web Conferencing To Train, Manage And Support Your Sales Team
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The answer...
They know they don't have all the answers and they also realize the benefits of attending a small business workshop.
Let me share with you 3 reasons you should attend a small business workshop for online marketing in your area, perhaps Dallas, Fort Worth or another city in Texas.
1.
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Cisco CCNP Certification: BGP Attribute Category Tutorial
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Cisco CCNP Certification: BGP Attribute Category Tutorial spyware Annoying Spyware And Its Elimination Speakers
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Cisco CCNP Certification: BGP Attribute Category Tutorial
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