BGP is Just about the most sophisticated subjects you’ll review when pursuing your CCNP, Otherwise quite possibly the most complicated. I know from personal practical experience that Once i was earning my CCNP, BGP is The subject that gave me the most hassle to start with. Something I hold reminding nowadays’s CCNP candidates about, although, is the fact no Cisco engineering is difficult to grasp if you simply crack it down and comprehend the basic principles before you start seeking to grasp the more sophisticated configurations.
BGP characteristics are a person this kind of matter. You’ve received well-regarded necessary, properly-recognized discretionary, transitive, and non-transitive. Then you definately’ve got Every unique BGP attribute to remember, along with the order through which BGP considers characteristics, and what characteristics even are… along with a whole lot extra! As with every other Cisco subject matter, we have to wander ahead of we can easily operate. Let’s Have a look at what characteristics are and whatever they do in BGP.
BGP characteristics are much like what metrics are to OSPF, 안전공원 RIP, IGRP, and EIGRP. You gained’t see them mentioned in a routing desk, but characteristics are what BGP considers When picking the very best path to a vacation spot when multiple legitimate (loop-free) paths exist.
When BGP has to determine in between this sort of paths, There may be an buy in which BGP considers the path attributes. For fulfillment over the CCNP exams, you need to know this order. BGP seems at route attributes Within this purchase:
Greatest excess weight (Cisco-proprietary BGP benefit)
Best local choice (LOCAL_PREF)
Favor domestically originated route.
Shortest AS_PATH is chosen.
Select route with least expensive origin code. Inner paths are desired around exterior paths, and external paths https://en.search.wordpress.com/?src=organic&q=토토사이트 are most well-liked in excess of paths by having an origin of “incomplete”.
Cheapest multi-exit discriminator (MED)
External BGP routes most popular above Internal BGP routes.
If no exterior route, select route with most affordable IGP Expense to the next-hop router for iBGP.
Pick newest route.
Opt for least expensive BGP RID (Router ID).
For those who don’t determine what these values are, or how they’re configured, don’t panic! The following several aspects of this BGP tutorial will make clear everything. So commit a while learning this purchase, and partly II of this totally free BGP tutorial, we’ll check out Just about every of these values in detail. Hold learning!