BGP is one of the most complicated topics you’ll research when pursuing your CCNP, if not the most advanced. I understand from private expertise that After i was earning my CCNP, BGP is The subject that gave me the most difficulty initially. Another thing I keep reminding currently’s CCNP candidates about, however, is no Cisco engineering is unattainable to know if you simply split it down and understand the basic principles Before you begin trying to understand the more advanced configurations.
BGP attributes are 1 this sort of topic. You’ve acquired perfectly-acknowledged required, perfectly-known discretionary, transitive, and non-transitive. Then you definitely’ve bought Every single personal BGP attribute to recall, as well as the get by which BGP considers characteristics, and what characteristics even are… and also a large amount more! As with all other Cisco https://en.search.wordpress.com/?src=organic&q=먹튀검증 subject matter, we should walk prior to we are able to run. Allow’s Have a look at what attributes are and whatever they do in BGP.
BGP characteristics are very like what metrics are to OSPF, RIP, IGRP, and EIGRP. You received’t see them listed inside a routing table, but attributes are what BGP considers When picking the most effective path to a vacation spot when many legitimate (loop-free) paths exist.
When BGP has to determine concerning these paths, There is certainly an order in which BGP considers the path attributes. For fulfillment around the CCNP tests, you have to know this purchase. BGP seems to be at route characteristics With this buy:
Optimum pounds (Cisco-proprietary BGP value)
Optimum community preference (LOCAL_PREF)
Choose domestically originated route.
Shortest AS_PATH is most popular.
Pick route with cheapest origin code. Inner paths are chosen around external paths, and external paths are preferred above paths using an origin of “incomplete”.
Lowest multi-exit discriminator (MED)
External BGP routes most well-liked above Inner BGP routes.
If no external route, pick out path with most affordable IGP Price tag to the following-hop router for iBGP.
Opt for most 토토사이트 up-to-date route.
Pick least expensive BGP RID (Router ID).
If you don’t know very well what these values are, or how they’re configured, don’t worry! The subsequent several portions of this BGP tutorial will demonstrate all of it. So invest a while finding out this order, and partially II of the absolutely free BGP tutorial, we’ll take a look at Each and every of those values in detail. Retain learning!