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When you are studying for the BSCI examination on the way to gaining your CCNP certification, you have surely got to master the usage of BGP attributes. These capabilities enable you to manipulate the trail or paths that BGP use to reach a given destination when numerous paths to that destination exist. In this free BGP tutorial, were likely to take a look at the NEXT_HOP feature. You might be considering "hey, how complicated could this capability be?" Its not to complex at all, but this being Cisco, theres got to be at least one unusual aspect about it, right? The NEXT_HOP attribute is simple enough - this attribute indicates the next-hop IP address that needs to be taken to attain a spot. In case you hate to dig up further about needs, there are millions of online resources you should pursue. In the following example, R1 is a heart modem and R2 and R3 are spokes. All three routers come in BGP AS 100, with R1 having a connection with both R3 and R2. There is no BGP peering between R3 and R2. R3 is advertising the community 33.3.0.0 /24 via BGP, and the value of the attribute on R1 is the IP on R3 that is used in the peer relationship, 172.12.123.3. The issue with the feature is available in once the route is advertised to BGP peers. If R3 were in a different AS from R1 and R2, R1 would then advertise the route to R2 using the attribute set to 172.12.123.3. When a BGP speaker advertises a route to iBGP colleagues which was actually learned from an eBGP look, the value is retained. Linkliciousintegrationfxt Street Fire Member In Us includes supplementary resources concerning where to mull over it. Here, all three routers are in AS 100. Jazz Times includes more concerning the reason for this concept. Whatll the next-hop feature be set to when R1 advertises the approach to its iBGP neighbor R2? R2#show ip address bgp no production There will be no next-hop feature for the route on R2, since the route will not appear on R2. Learn more on an affiliated web page by visiting read. By default, a route wont be advertised by a BGP speaker to iBGP neighbors when the route was first learned from another iBGP friend. Fortuitously for us, there are numerous ways around this concept. The most frequent is the utilization of route reflectors, and well look at RRs in another free BGP tutorial..