![]() To avoid routing loops, BGP specifies that routes learned via IBGP should not be advertised to other IBGP peers ( BGP split-horizon rule). Establishing an EBGP peering with another ISP enables the exchange of routes, that is, communication between ISPs. An ISP is running IBGP within its own autonomous system. The above figure represents the idea of IBGP and EBGP from the perspective of an Internet Service Provider (ISP). When BGP peering is established between routers in different ASs, we refer to external BGP, EBGP. When BGP peering is established between two routers within the same AS, we refer to internal BGP relationship, IBGP. ![]() Routers that form neighbor relationship between each other in order to exchange routing information are referred to as BGP peers. ![]() Routers that run a BGP process are referred to as BGP speakers. It is therefore also called an interdomain routing protocol.įrom BGP’s perspective, the whole Internet is an entity of ASs, each of which is identified by a unique AS number. The role of BGP is to route information between autonomous systems (mainly ISP networks). They usually fall under the administration of a single network engineer or organization. The content of this article does not require a thorough understanding of BGP, but still, it is assumed you have a prior knowledge of routing protocols, and that you are familiar with the idea of interior/exterior routing protocols and neighbor relationships.Īs you probably remember from the CCNA level, autonomous systems (AS in further text) are routing domains with their own independent routing policies and unique routing protocols. ![]() In either case, feel free to proceed with reading. Or I might be wrong, and you have heard about this cool protocol numerous times, but just did not figure out how it works. If you decided to read the content of this post, you probably know something (or a lot) about Border Gateway Protocol (BGP) and its benefits. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |