|
||||||
CCNP Certification BSCI Exam Tutorial The BGP Neighbor ProcessLike TCP, BGP is connection-oriented. An underlying connection between two BGP speakers is established before any routing information is exchanged. This connection takes place on TCP port 179. As with EIGRP and OSPF, keepalive messages are sent out by the BGP speakers in order to keep this relationship alive. Cisco CCNP Certification BSCI Exam Tutorial An Introduction To BGP Cisco CCNP Certification / BSCI Exam Tutorial: An Introduction To BGP When youre studying for the BSCI exam on the way to earning your CCNP certification, its safe to say that BGP is like nothing y.. While almost all of the neighbor options are just that -- optional -- you do have to specify the BGP AS of the remote router. BGP has no mechanism to dynamically discover neighbors. Remember, BGP speakers do not have to be in the same AS to become peers. To verify that the remote BGP speaker has become a peer, run show ip bgp neighbor. R1#show ip bgp neighbor BGP neighbor is 172.12.123.3, remote AS 200, external link BGP version 4, remote router ID 0.0.0.0 BGP state = Active Last read 00:01:39, hold time is 180, keepalive interval is 60 seconds Received 0 messages, 0 notifications, 0 in queue Sent 0 messages, 0 notifications, 0 in queue Route refresh request: received 0, sent 0 Default minimum time between advertisement runs is 30 seconds The output here can be a little misleading the first time you read it. The first highlighted line shows 172.12.123.3 is a BGP neighbor, is located in AS 200, and is an external link, indicating that the neighbor is in another AS entirely. The second highlighted line shows the BGP state as Active. This sounds great, but it actually means that a BGP peer connection does not yet exist with the prospective neighbor. So even though the show ip bgp neighbor output indicated that this is an Active neighbor relationship, that?s not as good as it sounds. Of course, the reason the peer relationship hasn?t been established is that we haven?t configured R3 yet! R3(config)#router bgp 200 R3(config-router)#neighbor 172.12.123.1 remote-as 100 CCNP BSCI Exam Tutorial Route Summarization And The OSPF Null Interface CCNP / BSCI Exam Tutorial: Route Summarization And The OSPF Null Interface CCNP exam success, particularly on the BSCI exam, demands you understand the details of route summarization. This skill not.. Verify the peer establishment with show ip bgp neighbor: R3#show ip bgp neighbor BGP neighbor is 172.12.123.1, remote AS 100, external link BGP version 4, remote router ID 172.12.123.1 BGP state = Established, up for 00:01:18 Last read 00:00:17, hold time is 180, keepalive interval is 60 seconds Local host: 172.12.123.3, Local port: 179 (BGP uses TCP Port 179) Foreign host: 172.12.123.1, Foreign port: 11007 The peer relationship between R1 and R3 has been established. Now that you know how the neighbor relationship itself is built, you can start learning the many options of the neighbor command. You?ll have to master these to become a CCNP and CCIE, and we?ll start looking at those commands in the next part of this BGP tutorial! Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage, home of freeCCNP andCCNA tutorials, The Ultimate CCNA Study Package, and Ultimate CCNP Study Packages. You can also join his RSS feed and visit his blog, which is updated several times daily with new Cisco certification articles, free tutorials, and daily CCNA / CCNP exam questions! Details are on the website. For a FREE copy of his latest e-books, ,How To Pass The CCNA, and ,How To Pass The CCNP,, just visit the website! You can also get FREE CCNA and CCNP exam questions every day! Pass theCCNP exam with The Bryant Advantage!
|
||||||
