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When youre studying for the BSCI exam on the solution to earning your CCNP accreditation, you have surely got to master the use of BGP attributes. These attributes enable you to adjust the path or paths that BGP uses to reach a given destination when multiple paths to that destination exist. In this free BGP training, we are likely to take a peek at-the NEXT_HOP credit. You may be considering "hey, how difficult can this capability be?" It is not very complex at all, but this being Cisco, theres got to be at least one unusual aspect about it, right? The NEXT_HOP attribute is easy enough - this attribute indicates the next-hop IP address that should be taken to reach a destination. Within the following example, R1 is a center modem and R2 and R3 are spokes. All three routers are in BGP AS 100, with R1 having a connection with both R2 and R3. Theres no BGP peering between R3 and R2. R3 is advertising the network 33.3.0.0 /24 via BGP, and the importance of the characteristic on R1 is the IP on R3 thats used in the peer relationship, 172.12.123.3. The matter using the next-hop attribute is available in when the route is advertised to BGP peers. If R3 were in a different AS from R1 and R2, the route would be then advertised by R1 to R2 using the attribute set to 172.12.123.3. Be taught supplementary info on our related article by clicking the infographic. The next-hop value is kept, when a BGP speaker advertises a path to iBGP friends that was initially learned from an eBGP fellow. Here, all three routers come in AS 100. What will the characteristic be set to when R1 advertises the approach to its iBGP friend R2? R2#show ip address bgp no production There will be no next-hop capability for the route on R2, since the route will not look on R2. Automagically, a BGP speaker wont promote a to iBGP neighbors if the route was first learned from another iBGP friend. Get further on our affiliated URL by going to linklicious or lindexed. Luckily for us, there are many ways around this rule. Browsing To linklicious discount perhaps provides suggestions you should use with your family friend. The most typical is the utilization of route reflectors, and well look at RRs in a future free BGP tutorial..