When you"re studying for the BSCI test on the method to making your CCNP accreditation, you have surely got to master the usage of BGP attributes. These attributes enable you to change the road or paths that BGP will use to reach a given destination when multiple paths to that destination exist.
Within this free BGP guide, we are going to take a peek at-the NEXT_HOP feature. You may well be thinking "hey, how difficult can this capability be?" It is not very complicated at all, but this being Cisco, there"s got to be at least one unusual detail about it, right?
The NEXT_HOP attribute is easy enough - this attribute indicates the next-hop IP address that should be taken to achieve a spot. In the following example, R1 is a link router and R3 and R2 are spokes. All three routers are in BGP AS 100, with R1 having a relationship with both R3 and R2. There is no BGP peering between R2 and R3.
R3 is advertising the network 188.8.131.52 /24 via BGP, and the value of the next-hop characteristic on R1 is the IP on R3 that is used in the peer relationship, 184.108.40.206.
The problem with the next-hop attribute comes in once the route is advertised to BGP peers. If R3 were in a different AS from R1 and R2, R1 could then advertise the route to R2 using the next-hop attribute set to 220.127.116.11. The next-hop value is stored, when a BGP speaker advertises an approach to iBGP peers that was initially learned from an eBGP peer.
Here, all three routers are in AS 100. What will the next-hop characteristic be set to when R1 advertises the approach to its iBGP friend R2?
R2#show ip bgp
There will be no next-hop capability for the route on R2, since the route will not look on R2. Automagically, a route won"t be advertised by a BGP speaker to iBGP neighbors when the route was first learned from another iBGP friend. If you are concerned by irony, you will maybe wish to research about linklicious backlinks
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. The most frequent is the usage of route reflectors, and we"ll look at RRs in a future free BGP training..
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