From: Tomasz Zieba (tzieba@cisco.com)
Date: Wed Mar 25 2009 - 08:49:25 ART
Errata ... MPLS VPN is a reason for iBGP. Unless you do Inter AS MPLS VPN.
Tomasz Zieba pisze:
> 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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