Introduction to BGP

[lagapidis (Lazarus Agapidis)]

Hello Po

Here are some links to resources that will help you understand the difference between IGPs such as OSPF and EIGRP, and EGPs such as BGP.

• NetworkLessons Note on the difference between IGPs and EGPs
• NetworkLessons Note on why we need IGPs within an AS for BGP to work
• NetworkLessons Note on why OSPF is not suitable for use on the Internet

Some posts that will also help:

Internal BGP (Border Gateway Protocol) explained

Hello Vivek Remember that in order to correctly configure iBGP within an AS, you must first ensure that you have successful routing between all routers within that AS using an IGP or using static routing. Make sure that the loopbacks on all of your routers are reachable from all other loopbacks in the network. Also, keep in mind that iBGP requires that you create BGP peers not only between directly connected routers but between ALL routers. So in your topology, each iBGP router should have t…

Internal BGP (Border Gateway Protocol) explained

Hello Pipat BGP does indeed interoperate with IGPs, but of course we can’t cut out IGPs. Take a look at this post that compares BGP to OSPF. The comparison could well have been between BGP and any IGP. The above link describes the role of BGP as compared to that of IGPs. Each one does indeed have a specific role that is ideal for its purpose. BGP and IGPs do indeed complete each other . I hope this has been helpful! Laz

I hope this has been helpful!

Laz