BGP is Among the most sophisticated topics you’ll examine when pursuing your CCNP, Otherwise the most elaborate. I understand from individual practical experience that when I was earning my CCNP, BGP is the topic that gave me essentially the most problems at the beginning. Another thing I retain reminding these days’s CCNP candidates about, while, is the fact that no Cisco technological innovation 토토사이트 is unachievable to know if you only break it down and have an understanding of the fundamentals before you start making an attempt to understand the greater complex configurations.
BGP attributes are a single these subject matter. You’ve got well-known necessary, well-recognised discretionary, transitive, and non-transitive. Then you definately’ve obtained Each individual individual BGP attribute to keep in mind, and also the buy where BGP considers characteristics, and what attributes even are… and also a great deal extra! As with all other Cisco topic, we should stroll in advance of we will operate. Enable’s Check out what attributes are and what they do in BGP.
BGP characteristics are very like what metrics are to OSPF, RIP, IGRP, and EIGRP. You gained’t see them listed in the routing desk, but attributes are what BGP considers When selecting the very best route to a spot when a number of valid (loop-free of charge) paths exist.
When BGP has to determine amongst these kinds of paths, there is an order by which BGP considers the path characteristics. For fulfillment to the CCNP examinations, you have to know this purchase. BGP appears to be like at path characteristics On this purchase:
Optimum excess weight (Cisco-proprietary BGP price)
Maximum regional preference (LOCAL_PREF)
Favor locally originated route.
Shortest AS_PATH is favored.
Pick out route with lowest origin code. Inside paths are chosen over external paths, and external paths are favored more than paths with the origin of “incomplete”.
Lowest multi-exit discriminator (MED)
Exterior BGP routes most popular about Inner BGP routes.
If no exterior route, pick path with least expensive IGP Price tag to another-hop router for iBGP.
Pick out newest http://query.nytimes.com/search/sitesearch/?action=click&contentCollection®ion=TopBar&WT.nav=searchWidget&module=SearchSubmit&pgtype=Homepage#/토토사이트 route.
Opt for lowest BGP RID (Router ID).
For those who don’t determine what these values are, or how they’re configured, don’t worry! The subsequent quite a few areas of this BGP tutorial will reveal it all. So expend some time learning this purchase, and in part II of this free of charge BGP tutorial, we’ll evaluate Each and every of these values intimately. Maintain learning!