# Internal BGP (Border Gateway Protocol) explained
**URL:** https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129
**Category:** Lessons Discussion
**Created:** [December 27, 2016, 4:13pm UTC](https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129 "2016-12-27T16:13:05Z")
**Posts on this page:** 20
**Page:** 1
### Author:  [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)
#### Post date: [December 27, 2016, 4:13pm UTC](https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129/1 "2016-12-27T16:13:05Z")
This topic is to discuss the following lesson:
> **[Internal BGP (Border Gateway Protocol) explained](https://networklessons.com/bgp/internal-bgp-border-gateway-protocol-explained)**
>
> This lesson explains why we need Internal BGP, what IBGP split horizon is about and how to configure IBGP on Cisco IOS Routers.
---
### Author:  [@system](https://forum.networklessons.com/u/system)
#### Post date: [September 12, 2014, 3:59pm UTC](https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129/2 "2014-09-12T15:59:10Z")
Could not understand this…
“loop prevention van BGP is “als AS hetzelfde is dan hebben we een loop maar dit kan niet met ibgp want AS is altijd hetzelfde.”. dus wat doen we dan….IBGP -\> IBGP -\> IBGP niet doorsturen.”
---
### Author:  [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)
#### Post date: [September 12, 2014, 4:18pm UTC](https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129/3 "2014-09-12T16:18:41Z")
You caught one of my notes in Dutch… Just removed it 🙂
---
### Author:  [@neerajhclsingh](https://forum.networklessons.com/u/neerajhclsingh)
#### Post date: [September 16, 2014, 6:13pm UTC](https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129/4 "2014-09-16T18:13:04Z")
Hi Rene,
Ur explanation was good..plz also describes about BGP Route Reflectors and Confederations.
---
### Author:  [@system](https://forum.networklessons.com/u/system)
#### Post date: [September 17, 2014, 7:45am UTC](https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129/5 "2014-09-17T07:45:45Z")
Thanx . you explained it step by step and it was very informative..
---
### Author:  [@system](https://forum.networklessons.com/u/system)
#### Post date: [September 21, 2014, 2:50pm UTC](https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129/6 "2014-09-21T14:50:04Z")
your explanation is great and every clear… thanks a lot…
---
### Author:  [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)
#### Post date: [September 22, 2014, 7:39am UTC](https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129/7 "2014-09-22T07:39:36Z")
Hi Neeraj,
You are welcome, the tutorials for route reflectors and confederations are also online now.
Rene
---
### Author:  [@system](https://forum.networklessons.com/u/system)
#### Post date: [September 23, 2014, 5:25pm UTC](https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129/8 "2014-09-23T17:25:29Z")
Thank you :). It was easy to understand the way you explained. Can you please put some Redistribution stuff :). thanks in advance
---
### Author:  [@system](https://forum.networklessons.com/u/system)
#### Post date: [September 24, 2014, 2:33am UTC](https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129/9 "2014-09-24T02:33:39Z")
Thanks a lot ! Your explanation is Awesome ,! It helped me so much … Cheers!
---
### Author:  [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)
#### Post date: [September 24, 2014, 6:36am UTC](https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129/10 "2014-09-24T06:36:12Z")
You are welcome, I have a couple of tutorials on redistribution but I’ll add some more in the future.
---
### Author:  [@singhronie](https://forum.networklessons.com/u/singhronie)
#### Post date: [February 20, 2015, 9:37am UTC](https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129/11 "2015-02-20T09:37:41Z")
Hi Rene,
I am impressed by your tutorials. I would like to request you the tutorials for Virtual Routing and Forwarding VRF-lite, VNet Trunk, NAT64 and so on. Those are added to current CCNP Route (300-101) curriculum by Cisco.
I am looking forward to see those on your web.
Best Regards,
Ronnie
---
### Author:  [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)
#### Post date: [February 20, 2015, 11:20am UTC](https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129/12 "2015-02-20T11:20:50Z")
Hi Ronnie,
Glad to hear you like my work! I’ll add these tutorials next week.
Rene
---
### Author:  [@singhronie](https://forum.networklessons.com/u/singhronie)
#### Post date: [March 10, 2015, 9:38am UTC](https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129/13 "2015-03-10T09:38:42Z")
Hi Rene,
Have you uploaded new tutorials ? Please upload more.
Thank you.
Best Regards,
Ronnie
---
### Author:  [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)
#### Post date: [March 10, 2015, 9:59am UTC](https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129/14 "2015-03-10T09:59:28Z")
Hi Ronnie,
This week I’m creating a lot of new content. Anything in particular you like to see?
Rene
---
### Author:  [@usmanishtiaq](https://forum.networklessons.com/u/usmanishtiaq)
#### Post date: [April 5, 2015, 12:39pm UTC](https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129/15 "2015-04-05T12:39:34Z")
Hi Rene,
Really nice to see your work. Can u please add and explain BGP Route Dampening?
Best Regards,
Usman
---
### Author:  [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)
#### Post date: [April 6, 2015, 12:56pm UTC](https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129/16 "2015-04-06T12:56:38Z")
Hi Usman,
Glad to hear you like it! I’ve added BGP route dampening to my list, it’s a nice topic to write about.
Rene
---
### Author:  [@usmanishtiaq](https://forum.networklessons.com/u/usmanishtiaq)
#### Post date: [April 6, 2015, 10:38pm UTC](https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129/17 "2015-04-06T22:38:19Z")
Dearest Rene,
Kindly share the URL where you have added BGP route Dampening as i am finding it difficult to search it.
With Thanks
Usman
---
### Author:  [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)
#### Post date: [April 7, 2015, 8:46am UTC](https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129/18 "2015-04-07T08:46:26Z")
Dear Usman,
It’s not finished yet 🙂 In a few days I’ll upload it and send you a message ok?
Rene
---
### Author:  [@usmanishtiaq](https://forum.networklessons.com/u/usmanishtiaq)
#### Post date: [April 7, 2015, 1:43pm UTC](https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129/19 "2015-04-07T13:43:53Z")
Dear Rene,
Acknowledged with Thanks 🙂
With Best Regards,
Usman
---
### Author:  [@hamoodrehman87](https://forum.networklessons.com/u/hamoodrehman87)
#### Post date: [June 10, 2015, 11:39pm UTC](https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129/20 "2015-06-10T23:39:47Z")
Rene,
Great lesson however, I do have a question about IGP/IBGP. Why do we need to configure IGP (OSPF) in AS2 to establish IBGP connectivity between R2/R3/R4? Why can’t we just use loopback addresses on each router in AS2 and establish BGP peering and advertize loopbacks under the network command?
Thanks
Hamood
[Next page](https://forum.networklessons.com/t/internal-bgp-border-gateway-protocol-explained/1129.md?page=2)