Cisco CCNA / CCNP Certification: Introduction To BGP Attributes
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BGP is one particular of the most complicated subjects you'll study when pursuing your CCNP, if not the most complicated. I know from private knowledge that when I was earning my CCNP, BGP is the subject that gave me the most problems at initial. Identify more on an affiliated article directory - Click this web page: close remove frame. One particular point I preserve reminding today's CCNP candidates about, even though, is that no Cisco technology is not possible to understand if you just break it down and comprehend the fundamentals just before you start off trying to understand the more complex configurations.
BGP attributes are 1 such topic. You have got effectively-recognized mandatory, well-known discretionary, transitive, and non-transitive. Then you've got each and every person BGP attribute to bear in mind, and the order in which BGP considers attributes, and what attributes even are.. Visiting inside couchbase php session possibly provides aids you might give to your family friend. and a lot a lot more! As with any other Cisco topic, we have to stroll before we can run. Be taught new resources on html5 form generator free by browsing our grand article. Let's take a look at what attributes are and what they do in BGP.
BGP attributes are considerably like what metrics are to OSPF, RIP, IGRP, and EIGRP. In case you want to get additional info on sublime text 2 docblockr, we recommend many online libraries you might pursue. You will not see them listed in a routing table, but attributes are what BGP considers when picking the best path to a destination when multiple valid (loop-free) paths exist.
When BGP has to choose among such paths, there is an order in which BGP considers the path attributes. For success on the CCNP exams, you want to know this order. BGP looks at path attributes in this order:
Highest weight (Cisco-proprietary BGP value)
Highest nearby preference (Nearby_PREF)
Choose locally originated route.
Shortest AS_PATH is preferred.
Pick route with lowest origin code. Internal paths are preferred over external paths, and external paths are preferred more than paths with an origin of "incomplete".
Lowest multi-exit discriminator (MED)
External BGP routes preferred over Internal BGP routes.
If no external route, pick path with lowest IGP expense to the next-hop router for iBGP.
Choose most recent route.
Pick lowest BGP RID (Router ID).
If you do not know what these values are, or how they're configured, don't panic! The next many parts of this BGP tutorial will explain it all. So spend some time studying this order, and in component II of this cost-free BGP tutorial, we'll look at every single of these values in detail. Hold studying!.
