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IBGP:

Unanswered Question
Apr 16th, 2003
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Hi,

Few clarifications on IBGP.


Documents says IBGP is more flexible and has loop free architecture compare to other IGP protocols, does it mean OSPF is inferior to IBGP in providing loop free environment.


What prevents IBGP being deployed widely as IGP instead of OSPF. More organizations prefer OSPF over IBGP as thier IGP, why not IBGP?


A document says IBGP requires STATIC ROUTES (next hop address) to run as IGP, why so?


Chaotic ........


Thanks

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jhalldn Thu, 04/17/2003 - 05:06
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Hey!

IBGP is shortened for internal BGP. BGP was made to use as a EGP.

When a BGP peer is advertsing a prefix it learned, it must know the next hop address. If not it will not advertise the prefix. To use IBGP u'll need some fullmesh design, hence all peers must talk to eachother.


You must use some other routing protocol so that all BGP peers can find eachother (ospf, static...).


Some good WAN design is to use OSPF/ISIS as a IGP for the links and loopbacks. Then use IBGP and advertise all LAN address. This way u will have good convergence and stable database.

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