ClotildaColman690

When you're studying for the BSCI exam on the way to gaining your CCNP certification, you've got to learn the use of BGP attributes. These capabilities allow you to manipulate the path or paths that BGP use to attain certain destination when numerous paths to that destination exist. To get extra information, please consider checking out linklicious me. In this free BGP tutorial, we're planning to have a look at the NEXT_HOP characteristic. Perhaps you are thinking "hey, how difficult may this credit be?" It is not so complicated at all, but this being Cisco, there's got to be at least one unusual aspect about it, right? The NEXT_HOP attribute is simple enough - this attribute indicates the next-hop IP address that needs to be taken to achieve a destination. Within the following example, R1 is a centre router and R3 and R2 are spokes. All three routers come in BGP AS 100, with R1 having a relationship 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 importance of the credit on R1 is the IP address on R3 that's utilized in the peer relationship, 172.12.123.3. The issue using the next-hop feature will come in once the route is marketed to BGP peers. To get a second way of interpreting this, consider looking at linklicious coupon. If R3 were in another 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. The next-hop value is kept, whenever a BGP speaker advertises an approach to iBGP friends which was originally learned from an eBGP peer. To explore more, you might wish to have a peep at linklicious.me. Here, all three routers are in AS 100. What will the feature be established to when R1 advertises the approach to its iBGP friend R2? R2#show ip bgp < no result > There will be no next-hop attribute for the route on R2, because the route will not appear on R2. Automagically, a route will not be advertised by a BGP speaker to iBGP neighbors if the route was initially learned from another iBGP neighbor. Luckily for us, there are lots of ways around this rule. The most common is using route reflectors, and we'll look at RRs in a future free BGP training.. Link contains new info concerning how to look at it.