BGP is One of the more advanced subjects you’ll analyze when pursuing your CCNP, Otherwise essentially the most complex. I understand from own practical experience that when I was earning my CCNP, BGP is the topic that gave me essentially the most problems initially. Another thing I keep reminding these days’s CCNP candidates about, though, is always that no Cisco technological know-how is unachievable to comprehend if you only split it down and comprehend the basics Before you begin seeking to know the more sophisticated configurations.
BGP attributes are one this sort of topic. You’ve acquired well-regarded required, effectively-recognized discretionary, transitive, and non-transitive. Then you certainly’ve received Each individual person BGP attribute to recollect, along with http://www.bbc.co.uk/search?q=토토사이트 the order by which BGP considers characteristics, and what attributes even are… in addition to a whole lot much more! As with all other Cisco subject, we really have to stroll ahead of we are able to run. Allow’s Examine what attributes are and whatever they do in BGP.
BGP characteristics are very similar to what metrics are to OSPF, RIP, IGRP, and EIGRP. You received’t see them outlined within a routing table, but attributes are what BGP considers When selecting the best route to some destination when a number of valid (loop-no cost) paths exist.
When BGP has to make a decision concerning these kinds of paths, There is certainly an order through which BGP considers The trail characteristics. 메이저사이트 For achievement to the CCNP examinations, you need to know this purchase. BGP seems to be at path attributes During this get:
Highest bodyweight (Cisco-proprietary BGP value)
Maximum area desire (LOCAL_PREF)
Want domestically originated route.
Shortest AS_PATH is chosen.
Decide on route with cheapest origin code. Inside paths are preferred above exterior paths, and exterior paths are most well-liked more than paths by having an origin of “incomplete”.
Lowest multi-exit discriminator (MED)
External BGP routes desired more than Inner BGP routes.
If no exterior route, decide on route with cheapest IGP cost to another-hop router for iBGP.
Decide on most up-to-date route.
Select most affordable BGP RID (Router ID).
In case you don’t really know what these values are, or how they’re configured, don’t worry! The next quite a few portions of this BGP tutorial will reveal all of it. So spend a while learning this buy, and partly II of this absolutely free BGP tutorial, we’ll have a look at Just about every of these values in detail. Retain finding out!