From: Tomasz Zieba (tzieba@cisco.com)
Date: Wed Mar 25 2009 - 08:44:16 ART
Hi Akber,
First of eBGP. We need to use it when we peer with SP that uses BGP. The
other scenarios is that you are the SP. Another example is very large
enterprise network for which the IGP doesn't scale anymore. I would also
advise you to read Doyle's "Routing TCP/IP" to have clarification. Other
reasons is for example MPLS VPN.
The iBGP is used when you have more than one device in your network that
speaks eBGP. Then with iBGP you can transport all the Path Parameters
(local pref, communities, etc.) between these eBGP routers. Otherwise
you would have to redistribute bgp->igp->bgp and use route maps to
recover these values.
Cheers,
Tomasz,
Akber Ali Mirza pisze:
> Hi GS,
>
> I was going through couple of BGP practicals and could not able to
> understand when exactly we need to configure IBGP for LAN routing purpose
> along with BGP on WAN side.
>
> What are the scenarios when we need to use EBGP in WAN and other routing
> protocols ( Eigrp/OSPF ..etc) in LAN routing
>
> why we need IBGP when we are using BGP?Can't we use some other IGP protocols
> to communciate internally?
>
> Any help is highly appreciated .
>
> Thanks and Regards,
> Akber Mirza.
>
>
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