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Cisco CCNP / BSCI Tutorial

When you're studying for the BSCI examination on the way to getting your CCNP accreditation, you have got to learn the usage of BGP attributes. These features permit you to change the trail or paths that BGP use to achieve certain destination when multiple paths to that destination occur. To compare additional information, please look at: sites like linklicious.

Within this free BGP guide, we are likely to take a look in the NEXT_HOP credit. You may well be thinking \hey, how difficult may this attribute be?\ It is not so difficult at all, but this being Cisco, there is got to be at least one unusual aspect about it, right?

The NEXT_HOP attribute is simple enough - this attribute indicates the next-hop INTERNET protocol address that should be taken to achieve a spot. Within the following illustration, R1 is a heart hub and R3 and R2 are spokes. All three routers are in BGP AS 100, with R1 having a connection with both R3 and R2. There's no BGP peering between R3 and R2. Dig up more on our favorite related encyclopedia by browsing to linklicious.

R3 is advertising the network 33.3.0.0 /24 via BGP, and the importance of the next-hop feature on R1 is the IP address on R3 that's utilized in the peer relationship, 172.12.123.3.

The matter with the next-hop credit is available in if the route is marketed to BGP peers. To get a second standpoint, please check out: linklicious.me coupon reviews. If R3 were in another AS from R1 and R2, R1 could then advertise the route to R2 using the next-hop attribute set to 172.12.123.3. When a BGP speaker advertises a path to iBGP colleagues which was originally learned from an eBGP expert, the next-hop value is retained. Learn new info on a related site by going to index emperor.

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

R2#show internet protocol address bgp

< no result ">

There will be no next-hop attribute for the route on R2, because the route won't appear on R2. By default, a route won't be advertised by a BGP speaker to iBGP neighbors when the route was first 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 tutorial..

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