Using of IBPG

[The_guroo_2]

why would we use IBGP instead of IGP amoung connecting same AS .........????

[pkhatri]

BGP is designed for carrying a very large number of prefixes, whereas IGPs are not. For example, you will have trouble scaling OSPF and ISIS beyond 30000 prefixes. Also, IBGP will allow you to preserve route attributes (such as local pref and MED) whereas you lose those with IGPs.

Hope that helps,

Paresh

[amarsjoshi]

Routes from EBGP neighbors are redistributed automatically when you use IBGP, however if you use IGP then you have redistribute them..

However, if you have only a stub network with all routes having a single connection to the internet then you can probably generate a default in the IGP and use BGP for EBGP connectin only..

HTH,

Amar

[o_dogorshom]

hi,

Also you have to run iBGP in your AS if you want to use MPLS VPNs, because you need to use M-BGP to setup VPNs.

Osama.