Cisco iBGP Peering Basics

pgp basic Dearing's bgp basic Deering's BGP basic earrings they're so fun [Music] there's just so many things that make border gateway protocol unique when we are configuring it at the Cisco command line and one of the things that you need to get used to with it is first of all there is two types of peering 'z there's ibgp pairings that are made within an autonomous system and there's Eevee GPP rings and that's really fun to say EB GPE bgp ebgp those feelings are between autonomous systems so one of the first things you want to do in fact I just jumped right into global configuration mode right because I'm crazy like that no no we don't want to do that we would want to make sure we can reach the address that we want to peer with with BGP so I would ping one nine two one six eight dot zero dot three from the r1 device if I wanted to peer with that IP address from R 1 to R three for border gateway protocol purposes and once we ensure that we can reach it then we might have luck with the configuration so we go into global configuration mode we say router bgp two one three is our local autonomous system and then we indicate that we want a neighbor see we're statically configuring the neighbors we want a neighbor with one 92168 0.3 and the remote AAS is our own AS of two one three the fact that this is our autonomous system and we're peering with this device in this autonomous system this means that we are technically creating on ibgp peering that's right within an autonomous system now we need to do one more thing here and that is we are using our loopback address we intend to to peer with their loopback address BGP would want to use the physical IP addresses that are on the interfaces that connect these devices so we need to do the up arrow on the keyboard because we need to say look as far as the source of the traffic that we are sending use our loopback 0 interface and we'll make this same command on the r3 device and that will ensure that this ibgp peering comes up correctly so I'll end my configuration there on the r1 device and we will slide over to the r3 device and guess what we're gonna basically do what's called a mirrored configuration router bgp two one three I'm making a neighbor ship with 192.168.0.1 in remote AAS our own a s of two one three I am then gonna say up arrow on the keyboard and I'm gonna say our little update source loopback zero I'm gonna end and we're just gonna see there on our three and we're gonna look for that bgp peering to come up and there it did it came up so we are good to go we have just done a basic IV GP peering and if you don't believe me you probably would want to do this once in your life just a sanity check that this really did happen we could do a show IP BGP summary what a weird command right we're used to like show IP bgp neighbors that would kind of follow with what we're used to in like OSPF and by the way there is a show IP bgp neighbors command it just gives you a whole bunch of information about the peering yonks that is what we call verbose in the industry how about this show IP BGP summary that gives you the kind of format you're used to with like show IP ospf neighbors and a couple quick observations I want to make my window a little bigger or my font a little smaller because notice prefix received the d scrolled over on to this side of the screen i don't like that but anyways you get the idea here we are up we are happy happy and that how I can tell is that there isn't a state listed under this column instead of a state being listed right here it's the number of prefixes we've received from that neighbor it's the whopping number of 0 right now because in this quick video we're not going to actually share any prefixes we were just working on that I bgp peering well thanks so much for watching this quick look I be GP peer relationships and how we configure them safely and happily in the Cisco CLI PGP basic clearings BGP basic earrings BGP basic earrings there so [Music]

Channel: Anthony Sequeira

Views: 1,980

Keywords: cisco, CCNP, certification, cisco certifications, ccnp training, ccie, cisco training, information technology, ccnp data center, ccnp security, ccnp routing and switching, ccnp enterprise infrastructure, encor, tutorial, packet tracer, beginner, kevin wallace, network engineer, cisco live 2019, cisco live, new ccna

Id: TYoe1rAjYp4

Length: 4min 56sec (296 seconds)

Published: Fri Nov 08 2019