The below shows a basic configuration for a tunnel between the routers Jazz and Jules. In this instance router owen does not see the communication between jazz and jules.
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You can also configure eBGP using a loopback address (or any other operational interface) as shown in this section. Loopback interfaces are used in this manner to guarantee reachability in networks with multiple paths as shown in the Load Sharing Using the Loopback Address as a BGP Neighbor section of Load Sharing with BGP in Single and Multihomed Environments: Sample Configurations.
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In this configuration, the router owen is in AS 300 and Router jazz is in AS 400.
Peers must be directly connected when using eBGP. If they are not directly connected, the neighbor ebgp-multihop command must be used and a path through an IGP or static route to reach the peer must exist in order for the routers to establish neighbor relationship. In the configuration above, owen router belongs to AS 300 while jazz router belongs to AS 400.
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In this configuration, both routers are in AS 400.
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I’m a big fan of SLB, regardless of the technology, Cisco, Alteon, F5…..whatever! You can run SLB on your router for basic services in a round-robin type configuration, you can even add weightings if required – it’s a handy feature.
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Running a dual link configuration to ensure no SPOF using BGP and EIGRP.
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Because my brain and eyesight are failing fast, i have to write it down nowadays, here’s a very basic BGP configuration with 3 different Autonomous System (AS) Numbers.
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Basic config for a BGP Peer Group within an AS 123 and some iBGP routers. The config uses peer-group and route reflectors which saves you a lot of configuration on all the iBGP devices.
MystaJoneS 