The BGP Information page
BGP is an acronym for Border Gate Protocol.
BGP uses AS numbers to communicate with other routers. AS stands for Autonomous System. AS numbers are used to dictate a route or path to the network.
There are two types of BGP: IGP and EGP:
- IGP is also know as IBGP, which means Internal BGP. IBGP exists because all internal routers share the same AS numbers. This makes all internal routes equal. (OSPF might be a better option here...) Since all routes are the same, the weight will be the deciding factor in determining the closest route.
- EGP is External BGP. EBGP is when all routers have different AS numbers. When the numbers are different, the full advertized path is shown.
The weight is a numeric cost of a network link. This cost is meant to be directly tied to the true cost of a network. (An ISP may charge a per byte usage fee and we may want to avoid that if possible.) The cost can also be tied to the speed of a network, such as dialup or a E3.
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