This makes for a very simple bgp setup, where each router has the. An as is a set of routers under a single technical administration. The network command controls the networks that originate from this box. Bgp is the routing protocol of choice on the internet. Bgp in large networks to avoid loops, bgp routers are only allowed to learn prefixes over ibgp from the router that advertises them or learned them over ebgp. Packets may pass through several networks on their way to destination. The current version of bgp is bgp version 4, based on rfc4271. Its an important topic to understand if you work at an isp or at a large company that is connected to two or more isps. The bgp, which rfc 1771 defines, allows you to create loopfree interdomain routing between autonomous systems ass. Bgp is an interdomain routing protocol that is designed to provide loopfree routing between organizations. This module also contains tasks to configure and customize bgp peers, implement bgp route aggregation.
This concept is different than the familiar configuration with interior. In contrast, bgp routers exchange network reachability information. Ospf, isis, bgp are needed in the network they provide reachability label distribution protocols distribute labels for prefixes advertised by unicast routing protocols using either a dedicated label distribution protocol ldp extending existing protocols like bgp to distribute labels. Service typedependent the cost of the network depends on what service the packet needs.