Sergey Dec 20, 2017 8:16 AM (in response to Michael)
“remote-as” is a mandatory configuration attribute for any BGP neighbour. This attribute lets BGP know whether the neighbour is an iBGP or an eBGP neighbour. If the neighbour’s remote-as is the same as the one configured on the local router – the neighbour is iBGP. Otherwise it is an eBGP neighbour. I don’t quite understand what you mean by “EIGRP and OSPF list they stuff in the config files”, but BGP works in a very different way from any IGP protocol. In IGP, you enable interfaces to run advertisements and neighbours discover each other automatically, using some sort of hello messages (in case of OSPF and EIGRP). BGP is different. In BGP you have to manually configure the neighbours and the networks that you want to advertise.