BGP is Just about the most elaborate topics you’ll research when pursuing your CCNP, Otherwise essentially the most sophisticated. I realize from particular working experience that After i was earning my CCNP, BGP is the topic that gave me the most hassle initially. Another thing I retain reminding now’s CCNP candidates about, although, is usually that no Cisco engineering is not possible to know if you only split it down and have an understanding of the basics Before you begin striving to grasp the more elaborate configurations.
BGP attributes are one particular these kinds of subject. You’ve received perfectly-acknowledged necessary, well-acknowledged discretionary, transitive, and non-transitive. Then you definitely’ve received Just about every particular person BGP attribute to recall, as well as buy during which BGP considers characteristics, and what characteristics even are… and a lot a lot more! As with any other Cisco matter, we really need to wander ahead of we are able to operate. Enable’s take a look at what 메이저사이트 characteristics are and whatever they do in BGP.
BGP attributes are very similar to what metrics are to OSPF, RIP, IGRP, and EIGRP. You won’t see them stated in the routing desk, but attributes are what BGP considers when choosing the most beneficial route to a desired destination when various legitimate (loop-no cost) paths exist.
When BGP has to determine between such paths, There may be an buy where BGP considers The trail attributes. For achievement to the CCNP tests, you need to know this get. BGP appears to be at path characteristics Within this buy:
Optimum http://www.thefreedictionary.com/토토사이트 fat (Cisco-proprietary BGP worth)
Optimum area desire (LOCAL_PREF)
Like regionally originated route.
Shortest AS_PATH is preferred.
Select route with cheapest origin code. Interior paths are most well-liked in excess of external paths, and exterior paths are favored above paths having an origin of “incomplete”.
Lowest multi-exit discriminator (MED)
External BGP routes favored more than Inner BGP routes.
If no exterior route, find route with least expensive IGP Value to the next-hop router for iBGP.
Pick newest route.
Pick out most affordable BGP RID (Router ID).
If you don’t know what these values are, or how they’re configured, don’t stress! The subsequent a number of elements of this BGP tutorial will reveal it all. So commit a while learning this buy, and in part II of this no cost BGP tutorial, we’ll take a look at Just about every of such values intimately. Continue to keep finding out!