When you start preparing for your CCNP exam, particularly the BSCI exam, you're introduced to Border Gateway Protocol (BGP) configurations. BGP is unlike any protocol you learned during your CCNA studies, and even the similarities are a little bit different!
Laptop Battery BGP forms neighbor relationships, much like EIGRP and OSPF do. The interesting thing with BGP is that potential neighbors, or "peers", do not need to be directly connected and can use their loopback interfaces to form the peer relationships.
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Thinkpad It may well be to your advantage to use loopbacks to form peer relationships rather than the actual interface facing the potential neighbor. This can be done because BGP uses static neighbor statements rather than any kind of dynamic neighbor discovery process.
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Microsoft Consider a router that has two paths to a BGP speaker. The interfaces are numbered like this:
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Laptop Computers Router1: Serial0, 172.1.1.1 /24, Serial2, 179.1.1.1 /24, loopback0, 1.1.1.1 /32.
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Laptop Computer Router2: Serial0, 172.1.1.2/24, Serial2 179.1.1.2/24, loopback0, 2.2.2.2 /32.
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Desktop Computer We could configure Router1 like this:
Notebooks router bgp 200
Lenovo neighbor 172.1.1.2 remote-as 200
Hard Drive In this case, BGP would automatically use 172.1.1.1 as the source for the TCP connection that has to be set up with the neighbor before updates can be exchanged; this address is known as the best local address. However, if the remote peer's serial0 interface is shut down or goes down for another reason, the peer relationship would be lost even though Router2 is still available.
Travelstar Instead of using one of the physical interfaces, we can use the loopbacks on each router to establish the TCP-based peer connection. The configurations would look like this:
Gateway Router1:
Laptop Parts router bgp 200
Software neighbor 2.2.2.2 remote-as 200
Hard Drives neighbor 2.2.2.2 update-source loopback0
Electronics Router2:
Canon router bgp 200
Desktop Pc neighbor 1.1.1.1 remote-as 200
Desktop Computers neighbor 1.1.1.1 update-source loopback0
Think Pad In this case, losing one of the physical connections does not necessarily mean the BGP peering is lost; as long as the routers have a valid path to each other's loopback addresses, the BGP peer relationship will stay in place. And better yet, we avoid the dreaded "single point of failure"!
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