Understanding BGP Neighbors - Video By Sikandar Shaik || Dual CCIE (RS/SP) # 35012

[Music] in this video we will try to understand these are some of the concepts which we'll see in our video now like first we'll start with bgp neighbor ship like miserly we have two types of neighbor ship in BGP record internal BGP and external PCP so we'll see the differences and also we'll try to see the basic configuration of the BGP routing protocol we'll just try to understand the basic commands in this video probably in our next video we'll try to get into laps okay so we'll try to understand some basic commands and then finally we'll move to the different types of BGP tables like or if you have maintains three tables EHRs we maintain three tables similar way BGP also maintains these three tables so we'll try to differentiate what are those tables that's what we will see so let's get started with BGP neighbors ship so BGP neighbors are similar to your OST of neighbor ship or EHR P neighbors ship but there are some few differences or a few things which are not similar like the BGP neighbors form the Beast on the neighbors ship by using a TCP connection so on port number 179 and then they will exchange the routing updates the behavior bits are only exchanged once they form the neighbor ship and then this neighbor ship has to be manually configured now this neighbor ship is manually conjured will see that commands so what's the meaning of manually configured means I will try to get into that okay so let me tell you what is what is this manual neighbor ship now BGP neighbors ship is also called as BGP piece or we also call it as BGP speakers now mainly there are two types of neighbor ship ibgp neighbor ship internal BGP and external BGP and one more one more point the neighbor ship has to be manually configured now what is exactly manually so in this manually configuration like if I take an example in case of OSPF or EHR P let's say I'm using eSGR p ro SK protocols even these protocols also maintains neighbor table they automatically whenever you realize this interface it's going to send a hollow message on a multicast address and when you analyze the inter father interface it is going to reply to the hallo message and then they will automatically build the neighbors ship and they automatically become neighbors of each other and the bins a table called neighbor table and we can verify with YP ug RV neighbors in case of EHR P and we can use SH Y P of neighbors now there's something manual automatic neighbor ship or even in those protocols you can configure manual membership so that is again second rating but in case of BGP these two routers only exchange the routes after forming the neighbor ship just like with PF but the difference is on the router one we have to configure a command called neighbor and whatever the IPS is let's say 1/9 1.1 1.2 and then on the router 2 you have to configure another command saying that neighbor whatever the IP let's say one dot one dot one dot one so when you manually configure on both the ends and if both the ends the configurations are correct and if both the ends these neighbors are reachable then only they will form the neighbor ship now the major difference between your IGP neighbors ship that is eh RPO SPF in EHR is P of the neighbor ship happens automatically based on multicast address whereas in case of BGP neighbors ship has to be manually configured that is the one major difference so we will see the configuration as well as we move on with our training sium it's also called as BGP peace or BGP speakers and we call two types of neighbors because internal BGP neighbors and external BGP neighbors so the basic difference again between these two is internal BGP neighbors we call as ibgp neighbors if the routers this router a router B this is out a router B router C router D all these four routers or neighbors of each other and all the four routers are in the same is what is that a is autonomous system sixty five thousand five hundred were referred as ibgp neighbors because router a is a neighbor of outer B now Derby is a neighbor of router a and both belong to the same autonomous system number now this type of labor ship we call as internal BGP neighbors whereas here you can see C and X these two or external BGP neighbors we call them as ebgp animals because router c is in a is sixty five thousand five hundred and sixty five thousand one hundred so they both you know in different days we call them as xnor bgp neighbors like I got a diagram here you can see see an X or e vcp neighbors and D and Y or CVG containers whereas all the ABCD or internal BGP neighbors so that's a basic difference and then the next thing we'll see just like your OSPF or EHR P BGP also maintains three kinds of tables neighbor table BGP table routing table now when you talk about routing table it's a similar one it contains a list of best routes whatever the best route installed in the routing table it will be shown by using a command called show IP route neighbor ship is contained a neighbor should table contains a list of neighbors which are configured by the administrator and one more thing we discuss just now the neighbors has to be manually configured by using a neighbor command and for verification we can use YP BGP summary and show IP BGP neighbors command these two commands will be very useful to verify whether the neighbor sheepies up or not okay now one more thing is now this neighbor ship no need to be directly connected so we'll see that potala john rule those things will definitely get into when we get into laughs we'll see in our next video probably and then BGP table it contains all the routes which are advertised in BGP non by BGP nothing but all the networks which ever you are as in BGP we can verify by using a command called show IP BGP command so majorly this BGP table we'll see more in detail when we move on with probably after four five videos we'll be getting into this BGP table verification but the next three four videos will be majorly focusing on neighbors ship how to compute the neighbors ship and what are the different ways of contouring the neighbors shape okay because if the neighbor ship is up then everything you can you can see the things will work only once the neighbor ship is established okay we have a lot of variations in the neighbor ship like interval we give you neighbors external bgp neighbors neighbors ship using loo bags and neighbor ship using a route reflectors so neighbor ship using tables with a lot of things so probably will try to get into those things more in detail in our next four five videos after that we'll be focusing on these bgp path selection process so when we discuss bgp path selection process we'll be focusing here so that is something we'll be getting into more in detail later on and then verifying the routing table also the same thing the last thing before we finish this video is we are going to see the basic configuration now the basic configuration in BGP is similar to your EHR P or OSPF like we start with router bgp and then we have to define the autonomous system number my own is if I am using 65,000 to define the a s number as 65,000 after that network command is similar like we are to if you want to advertise any network we have to say network and network ID and this mask option is optional now a mask option option and more in detail about this I'll explain in my next video where will we see some practical examples so I will give you some more in detail about this configuration when I do the latch so apart from that there is a neighbor command so neighbor command is mandatory here why because here on the router one you have to configure enable command saying that neighbor whatever type levels they say the IP address of the router to is one dot one dot one dot two okay and both the routers are in the same is let's say ASM buddy's 500 I had to say remote EAS and then I have to define the ASM whereas 500 so if this labor and sorry I think I am using 65,000 here so let's let's do the same number so it is 65,000 the time using 64,000 here and if I use 65,000 here automatically the router will understand that it's the internal BGP neighbors because my is and the neighbor is is same if this number here and this member are different then it will automatically understand as external bgp neighbors so that's how based on the configuration what you are doing the devices will understand automatically whether you are configuring the external bgp neighbor or internal BGP neighbor ok so let us quickly revise what we discussed so first we started with BGP neighbors the point main part of the BGP neighbor chippies neighbor ship has to be manually configured as the first thing we have seen initially and we have two types of neighbors internal BGP enables interval BGP neighbors in both the routers or in the same is we call them as internal BGP neighbors and external BGP neighbors if one router is in layers and the other router is in different days these two routers are safe or as external BGP numbers and then we have seen some of the basic configuration of the routing protocol like we we mainly use neighbor command inside your router bgp and whatever the a is number and then we use some Network commands to advertise so it's more like euro is po4 HRP except this neighbor command and then BGP maintains three tables it maintains a neighbor table and we can verify the neighbor table by giving a sh YP BGP summary command or show IP BGP neighbors command v GP database table or BGP table it has all the routes which are addressed inside the BGP and finally we have routing table which contains the best route to the destination okay so probably we'll see you in our next video where we'll try to get into some more laps [Music]

Channel: Sikandar Shaik

Views: 91,439

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Keywords: bgp, bgp video, noa, noa videos, ccna, ccna videos, ccnp, cisco, ccie, subnetting, ccna security, ospf, firewall, ccna subnetting, ipv6, bgp videos, stp, ccna vdieos, ccna free video, ccie certification, ios, iou, virtual, eigrp, cisco virtual lab, iosv, asav, gns3, routing, noa vdieos, noa solutions, zone based firewall, zone pair, zbf, flsm, cisco firewall, cisco security, cisco certifications, wan, ip addressing, netmetric, vlsm, eigrp configuration, vlan, ccna, ccna videos, ccnp, cisco

Id: 66oksttO9fQ

Length: 10min 50sec (650 seconds)

Published: Tue Feb 28 2017