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quaintluna746   , 32

from Stillmore


Cisco CCNP / BSCI Tutorial: The BGP Attribute NEXT_HOP

When you are learning for the BSCI test on the solution to gaining your CCNP certification, you've got to learn the use of BGP attributes. These capabilities permit you to change the path or paths that BGP use to reach a given destination when numerous paths to that destination exist.

In this free BGP guide, we're likely to have a look at the NEXT_HOP characteristic. Maybe you are considering "hey, how difficult may this capability be?" It is not very complicated at all, but this being Cisco, there is got to be at least one unusual aspect about it, right?

The NEXT_HOP attribute is easy enough - this attribute indicates the next-hop INTERNET protocol address that should be taken to achieve a destination. In the following instance, R1 is a center hub and R3 and R2 are spokes. To study additional information, please check out: http://www.youtube.com/watch?v=vzfwkfaSSkQ. All three routers come in BGP AS 100, with R1 having a connection with both R2 and R3. Clicking indexbear.com likely provides aids you can use with your cousin. There's no BGP peering between R2 and R3.

R3 is advertising the network /24 via BGP, and the importance of the feature on R1 is the IP address on R3 that's found in the peer relationship,

The matter with the next-hop feature will come in when the route is marketed to BGP peers. If R3 were in a different AS from R1 and R2, the route would be then advertised by R1 to R2 with the attribute set to This forceful http://www.youtube.com/watch?v=BAUhprAi-dE! paper has varied surprising tips for the inner workings of it. When a BGP speaker advertises a route to iBGP friends that was initially learned from an eBGP fellow, the value is stored.

Here, all three routers are in AS 100. What'll the next-hop characteristic be established to when R1 advertises the path to its iBGP friend R2?

R2#show ip address bgp

< no productivity >

There will be no next-hop attribute for the route on R2, because the route won't appear on R2. Automagically, a BGP speaker will not advertise a to iBGP neighbors when the route was initially learned from another iBGP friend.

Luckily for us, there are lots of ways around this principle. The most frequent is the use of route reflectors, and we'll look at RRs in the next free BGP training.. This telling http://www.youtube.com/watch?v=BAUhprAi-dE! link has a pile of compelling warnings for how to provide for this concept.