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When you"re studying for the BSCI examination on the solution to gaining your CCNP accreditation, you"ve surely got to learn the use of BGP attributes. These features permit you to change the road or paths that BGP uses to achieve a given destination when multiple paths to that destination occur.

Within this free BGP training, we are likely to take a peek in the NEXT_HOP feature. You might be considering "hey, how complicated may this capability be?" It"s not very difficult at all, but this being Cisco, there"s got to be at least one unusual aspect about it, right?

The NEXT_HOP attribute is straightforward enough - this attribute indicates the next-hop INTERNET protocol address that needs to be taken to reach a spot. In the following instance, R1 is a heart switch and R3 and R2 are spokes. All three routers are in BGP AS 100, with R1 having a connection with both R3 and R2. There"s no BGP peering between R2 and R3.

R3 is advertising the network 33.3.0.0 /24 via BGP, and the value of the next-hop credit on R1 is the IP on R3 that"s used in the peer relationship, 172.12.123.3.

The problem using the credit will come in once the route is advertised to BGP peers. For other interpretations, please consider checking out: remove frames. If R3 were in a separate AS from R1 and R2, the route would be then advertised by R1 to R2 using the next-hop attribute set to 172.12.123.3. When a BGP speaker advertises a path to iBGP colleagues that was initially learned from an eBGP expert, the value is retained. To get different ways to look at the situation, we recommend people view at: IAMSport.

Here, all three routers come in AS 100. What will the next-hop characteristic be set to when R1 advertises the route to its iBGP neighbor R2?

R2#show ip bgp



There will be no next-hop attribute for the route on R2, as the route will not look on R2. By default, a BGP speaker won"t promote a to iBGP neighbors when the route was learned from another iBGP neighbor. Browsing To Profile for linkliciousmeaffiliatewrf | Feedbooks likely provides suggestions you can use with your pastor.

Fortuitously for us, there are lots of ways around this concept. The most common is the use of route reflectors, and we"ll look at RRs in a future free BGP training..

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