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Cisco CCNP / BSCI Tutorial: The BGP Attribute NEXT_HOP
01-13-2019, 11:13 PM
Post: #1
Big Grin Cisco CCNP / BSCI Tutorial: The BGP Attribute NEXT_HOP
When you're learning for the BSCI examination on the method to getting your CCNP certification, you've surely got to master the use of BGP attributes. These capabilities allow you to adjust the trail or paths that BGP uses to attain a given destination when multiple paths to that destination occur.

Within this free BGP guide, we're going to take a look in the NEXT_HOP attribute. To study additional info, please check out: 회원모집 - What To Try To Find In An Affiliate Program 35541. You may be thinking "hey, how difficult could this attribute be?" It's not to 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 straightforward enough - this attribute indicates the next-hop IP that needs to be taken to attain a destination. Going To 고객의소리 - Double Coupons 46028 seemingly provides suggestions you could tell your boss. In the following illustration, R1 is a link switch and R3 and R2 are spokes. All three routers come in BGP AS 100, with R1 having a relationship with both R2 and R3. There is no BGP peering between R2 and R3.

R3 is advertising the community 33.3.0.0 /24 via BGP, and the value of the next-hop characteristic on R1 is the IP address on R3 that's found in the peer relationship, 172.12.123.3.

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

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

R2#show ip address bgp

< no result >

There will be no next-hop credit for the route on R2, as the route won't look on R2. Clicking linklicious.me coupon maybe provides suggestions you could give to your uncle. 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 several ways around this concept. The most typical is the usage of route reflectors, and we'll look at RRs in a future free BGP article..
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