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Fix for minor spelling mistake

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Fixes a minor spelling mistake.
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Fredrik Lindqvist 2017-07-07 16:06:59 +02:00 committed by GitHub
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bgp-intro/README.md
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@ -518,7 +518,7 @@ While using OSPF to transport the routes to the other internal routes might work
### The usage of loopback addresses
It might have occured to you that the iBGP BIRD configuration specifies the local and remote address using loopback addresses instead of interface addresses from an actual connected subnet. Think back of the "The loopback address" section of the OSPF tutorial! The BGP router on the edge of the network, and the internal router which wants to learn about external connectivity using iBGP can be anywhere in the internal network. There may even exist multiple possible paths between them. By using a loopback address as source and target of the iBGP connection, the connection will keep functioning as long as there is any possible path between the two routers. The flow of traffic to the external network will follow the same directions as the iBGP control connection, since both of them use the IGP to reach each other.
It might have occurred to you that the iBGP BIRD configuration specifies the local and remote address using loopback addresses instead of interface addresses from an actual connected subnet. Think back of the "The loopback address" section of the OSPF tutorial! The BGP router on the edge of the network, and the internal router which wants to learn about external connectivity using iBGP can be anywhere in the internal network. There may even exist multiple possible paths between them. By using a loopback address as source and target of the iBGP connection, the connection will keep functioning as long as there is any possible path between the two routers. The flow of traffic to the external network will follow the same directions as the iBGP control connection, since both of them use the IGP to reach each other.
![iBGP relying on the IGP](/bgp-intro/ibgp-loopback.png)