BGP is The most sophisticated subject areas you’ll review when pursuing your CCNP, Otherwise essentially the most intricate. I realize from personal knowledge that After i was earning my CCNP, BGP is The subject that gave me one of the http://www.bbc.co.uk/search?q=토토사이트 most difficulties at the outset. Something I maintain reminding today’s CCNP candidates about, though, is no Cisco technologies is unattainable to know if you merely split it down and realize the fundamentals Before you begin striving to be aware of the more advanced configurations.
BGP attributes are a person these kinds of topic. You’ve received well-acknowledged mandatory, perfectly-known discretionary, transitive, and non-transitive. You then’ve acquired Each individual particular person BGP attribute to recollect, plus the order where BGP considers characteristics, and what characteristics even are… as well as a whole lot more! As with any other Cisco subject, we have to wander before we could operate. Enable’s Have a look at what attributes are and what they do in BGP.
BGP characteristics are very like what metrics are to OSPF, RIP, IGRP, and EIGRP. You received’t see them shown in a routing table, but characteristics are what BGP considers When picking the most effective path to the place 토토사이트 when various legitimate (loop-no cost) paths exist.
When BGP has to make your mind up among these types of paths, There may be an purchase by which BGP considers the path characteristics. For achievement over the CCNP exams, you need to know this purchase. BGP seems at path attributes in this order:
Best weight (Cisco-proprietary BGP price)
Best regional desire (LOCAL_PREF)
Want locally originated route.
Shortest AS_PATH is desired.
Choose route with least expensive origin code. Internal paths are chosen over external paths, and external paths are most popular in excess of paths having an origin of “incomplete”.
Cheapest multi-exit discriminator (MED)
Exterior BGP routes most well-liked over Interior BGP routes.
If no external route, pick out route with lowest IGP cost to the subsequent-hop router for iBGP.
Pick newest route.
Opt for most affordable BGP RID (Router ID).
If you don’t determine what these values are, or how they’re configured, don’t panic! Another various parts of this BGP tutorial will demonstrate it all. So expend some time researching this purchase, and in part II of this no cost BGP tutorial, we’ll examine Each and every of those values in detail. Preserve learning!