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When you're learning for the BSCI exam on the method to earning your CCNP certification, you've got to master the usage of BGP attributes. These features allow you to manipulate the trail or paths that BGP use to reach a given destination when numerous paths to that destination exist. Within this free BGP guide, we are planning to take a peek at-the NEXT_HOP feature. You may be considering "hey, how complicated could this credit be?" It is not to complicated at all, but this being Cisco, there is got to be at least one unusual detail about it, right? The NEXT_HOP attribute is easy enough - this attribute indicates the next-hop INTERNET protocol address that should be taken to attain a spot. In the following example, R1 is a center modem and R2 and R3 are spokes. All three routers come in BGP AS 100, with R1 having a connection with both R2 and R3. This provocative is linklicious worth it paper has endless forceful tips for where to provide for it. Get extra resources on our affiliated wiki by going to linklicious.org. There is no BGP peering between R2 and R3. R3 is advertising the community 33.3.0.0 /24 via BGP, and the importance of the next-hop attribute on R1 is the IP address on R3 that is used in the peer relationship, 172.12.123.3. The problem with the next-hop feature will come in when the route is marketed to BGP peers. If R3 were in a different AS from R1 and R2, R1 could then advertise the route to R2 using the next-hop attribute set to 172.12.123.3. The value is stored, when a BGP speaker advertises a path to iBGP peers that was initially learned from an eBGP fellow. Learn supplementary info on the affiliated paper by clicking linklicious alternative. Here, all three routers come in AS 100. Identify more on reviews on linklicious by browsing our rousing link. What will the next-hop attribute be set to when R1 advertises the approach to its iBGP neighbor R2? R2#show ip bgp < no result > There will be no next-hop feature for the route on R2, since the route will not look on R2. Automagically, a route won't be advertised by a BGP speaker to iBGP neighbors if the route was learned from another iBGP neighbor. Luckily for all of us, there are many ways around this principle. The most common is the usage of route reflectors, and we'll look at RRs in the next free BGP training..