BGP is One of the more advanced subjects you’ll study when pursuing your CCNP, Otherwise essentially the most intricate. I understand from personal working experience that when I was earning my CCNP, BGP is the topic that 토토사이트 gave me essentially the most http://query.nytimes.com/search/sitesearch/?action=click&contentCollection®ion=TopBar&WT.nav=searchWidget&module=SearchSubmit&pgtype=Homepage#/토토사이트 issues at the outset. Something I keep reminding right now’s CCNP candidates about, nevertheless, is that no Cisco know-how is difficult to know if you merely split it down and recognize the fundamentals before you start striving to be aware of the more advanced configurations.
BGP characteristics are just one such subject. You’ve acquired nicely-regarded necessary, effectively-regarded discretionary, transitive, and non-transitive. Then you definately’ve acquired Just about every person BGP attribute to recall, as well as purchase wherein BGP considers characteristics, and what characteristics even are… along with a whole lot additional! As with any other Cisco subject, we must stroll before we can run. Permit’s Check out what characteristics are and the things they do in BGP.
BGP characteristics are very like what metrics are to OSPF, RIP, IGRP, and EIGRP. You received’t see them detailed inside of a routing desk, but characteristics are what BGP considers When selecting the top route to the desired destination when multiple valid (loop-cost-free) paths exist.
When BGP has to choose between these kinds of paths, There may be an purchase during which BGP considers the path attributes. For fulfillment over the CCNP tests, you have to know this buy. BGP appears at path attributes On this get:
Greatest fat (Cisco-proprietary BGP value)
Highest area preference (LOCAL_PREF)
Prefer locally originated route.
Shortest AS_PATH is most well-liked.
Pick out route with least expensive origin code. Inner paths are chosen above exterior paths, and external paths are chosen more than paths having an origin of “incomplete”.
Cheapest multi-exit discriminator (MED)
External BGP routes preferred above Inside BGP routes.
If no exterior route, pick route with lowest IGP Price tag to the following-hop router for iBGP.
Decide on newest route.
Decide on lowest BGP RID (Router ID).
When you don’t really know what these values are, or how they’re configured, don’t stress! The following several areas of this BGP tutorial will make clear it all. So shell out some time studying this purchase, and in part II of the free BGP tutorial, we’ll examine Every single of such values in detail. Continue to keep finding out!