BGP with IGP

[amitchisti]

which igp protocol will be good to used with bgp, and what will be the difference, how you can tell your senior manager that this protocol will be good instead of using that... and what things we should consider on our mind when we configure igp with bgp protocols

[Julio E. Moisa]

Hi,

It depends the use that you want to apply, for example if you are going to receive routes through BGP in your edge router and you want to redistribute them into your internal network, you could use EIGRP or OSPF.

EIGRP and OSPF are great interior gateway protocols, the following link can help you to take a decision:

https://gotechsf.wordpress.com/2009/09/05/the-pros-and-cons-of-ospf-and-eigrp/

Now if you are going to use MP-BGP in order to create a MPLS network, the recommended IGP are OSPF and IS-IS routing protocols. 

Please don't forget to rate the comment if it is useful.

:-)

[chrihussey]

Too add to Julio, the most common choices are EIGRP and OSPF. Much depends on the size of your network and what you wish to accomplish. EIGRP can provide slightly quicker convergence and less CPU (than OSPF), however it is Cisco proprietary. OSPF is more of an industry standard, is just as good and not vendor specific which would give you greater flexibility.

Hope this is helpful

[Dmitri Popkov]

It depends on task you are trying to solve. If you want granular control on all network segmens and scalablity in future you can even consider BGP as you IGP. But it depends on network topology, tasks, policies and etc.

For example, if you have flat LAN with one site, you can use OSPF as your IGP (IS-IS is less popular in Enterprice segment) with summarization and stub areas

But if you have distributed network with lots of remote sites, you shoudl definetly config BGP or EIGRP (depends on size)

And of cource, if your network is very large and you are plaining to have multiple vrfs you should confider OSPF or IS-IS (if in future you will require some traffic engineering) with MPLS for L3PVN.