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e that I said "the basics". BGP is a quite complex protocol,[link widoczny dla zalogowanych], and when you pursue your CCIE,[link widoczny dla zalogowanych], you'll discern what I'm talking almost. As with always things Cisco, whereas, while broken down into smaller chips,[link widoczny dla zalogowanych], BGP becomes quite understandable. You will absence to understand the basics of BGP as presented in this part to pass your BSCI examination - so let's obtain started.
BGP Defined:
"An Internet protocol that enables teams of routers (called autonomous systems) to share routing information so namely effective, loop-free paths can be established. BGP is usually accustomed within and among Internet Service Providers (ISPs)."
There are a pair of terms in there that apply to the protocols you've mastered at present in your studies. The term "autonomous system" applies to IGRP and EIGRP as well for BGP; you'll be indicating a BGP AS in your configurations fair as you did with IGRP and EIGRP. And we're always looking as efficient, loop-free routes, right? As it did with IGRP and EIGRP, "autonomous system" simply refers to a group of routers that is administered by a unattached managerial body. An autonomous system will use an Interior Gateway Protocol (IGP) such as OSPF or EIGRP to route packets inside the AS; outdoor the AS,[link widoczny dla zalogowanych], one Exterior Gateway Protocol (EGP) such as BGP will be used.
BGP shares some specifics with some routing protocols you've yet studied. BGP assists VLSM,[link widoczny dla zalogowanych],[link widoczny dla zalogowanych], summarization, and CIDR. Like EIGRP, BGP will bring full updates when two routers initially chance neighbors and will send merely partial updates later that. BGP does create and maintain neighbor relationships ahead exchanging routes, and keepalives are sent to keep this relationship alive.
BGP has some important differences from the IGPs we've studied to this point. You'll listen BGP referred to as a path-vector protocol. As opposed to distance-vector protocols that interchange relatively simple information about accessible routes, BGP routers will commute vast information about networks to permit the routers to make extra smart routing determinations. This appended BGP route information comes in the form of attributes, and these path attributes are included in the updates sent by BGP routers. Attributes themselves are broken up into two classes, renowned and optional.
BGP likewise keeps a routing chart detach from the IP routing table.
We'll take a look by BGP attributes in future BSCI tutorials. In the meanwhile, keep studying!