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When you're studying for the BSCI exam on the way to earning your CCNP certification, you have got to learn the use of BGP attributes. These attributes allow you to change the road or paths that BGP will use to attain certain destination when multiple paths to that destination exist. Within this free BGP tutorial, we're planning to have a look in the NEXT_HOP attribute. Maybe you are considering "hey, how complicated could this capability be?" It's not very complicated at all, but this being Cisco, there is got to be at least one unusual aspect about it, right? The NEXT_HOP attribute is easy enough - this attribute indicates the next-hop INTERNET protocol address that needs to be taken to reach a destination. Within the following instance, R1 is a center router and R2 and R3 are spokes. All three routers are in BGP AS 100, with R1 having a relationship with both R2 and R3. Visit indexification to discover the meaning behind this view. There's 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 feature on R1 is the IP address on R3 that's utilized in the peer relationship, 172.12.123.3. The problem using the next-hop feature will come in when the route is advertised to BGP peers. If R3 were in another AS from R1 and R2, R1 could then advertise the route to R2 with the next-hop attribute set to 172.12.123.3. When a BGP speaker advertises a path to iBGP peers that has been originally learned from an eBGP expert, the value is retained. Here, all three routers are in AS 100. To get a second interpretation, please glance at human resources manager. To get additional information, please take a peep at buy here. For extra information, please peep at partner sites. What will the characteristic be set to when R1 advertises the route to its iBGP neighbor R2? R2#show ip address bgp < no productivity > There will be no next-hop capability for the route on R2, because the route will not appear on R2. By default, a BGP speaker will not promote a to iBGP neighbors if the route was first learned from another iBGP neighbor. Fortuitously for us, there are lots of ways around this principle. The most typical is the utilization of route reflectors, and we'll look at RRs in the next free BGP training..