Cisco CCNP BSCI Tutorial: The BGP Attribute NEXT HOP 30036

When you're learning for the BSCI exam on the method to gaining your CCNP accreditation, you've got to master the use of BGP attributes. Be taught further on our affiliated link - Navigate to this hyperlink: sponsors. These features permit you to adjust the trail or paths that BGP use to attain a given destination when multiple paths to that destination exist.

Within this free BGP guide, we're going to take a peek in the NEXT_HOP attribute. Maybe you are considering "hey, how complicated could this attribute be?" It is not to complex 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 IP address that needs to be taken to achieve a destination. In the following illustration, R1 is a centre modem and R3 and R2 are spokes. All three routers are in BGP AS 100, with R1 having a relationship with both R3 and R2. This unique NSEW > NEWS - Discount Treadmills Do You Get What You Pay For? 40344 link has a myriad of pushing warnings for the reason for it. There's no BGP peering between R3 and R2. Get more on our partner site - Click here: is linklicious good.

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 address on R3 that is found in the peer relationship, 172.12.123.3.

The problem with the attribute comes in when the route is advertised to BGP peers. If R3 were in another AS from R1 and R2, R1 would then advertise the route to R2 using the next-hop attribute set to 172.12.123.3. When a BGP speaker advertises a route to iBGP colleagues that was actually learned from an eBGP look, the value is stored.

Here, all three routers come in AS 100. What will the characteristic be established to when R1 advertises the path to its iBGP friend R2?

R2#show ip bgp



There will be no next-hop attribute for the route on R2, since the route will not appear on R2. Automatically, a route will not be advertised by a BGP speaker to iBGP neighbors if the route was first learned from another iBGP friend.

Luckily for us, there are numerous ways around this principle. The most typical is using route reflectors, and we'll look at RRs in a future free BGP tutorial..

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