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. IBGP will advertise all internal routes equally. (OSPF might be a better option here...) A weight factor is tied to each interface and 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. With EBGP, 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 may be desirable to avoid if possible.) The cost can also be tied to the speed of a network, such as dialup or a E3.
For consulting information and other questions, click here