Hi Vincent The Split Horizon concept as it applies to distance verctor protocols is used with BGP. Routes learned via IBGP are never propagated to other IBGP peers. To alleviate this issue you have two implementation choices, use a full-mesh IBGP setup or route-reflectors. For full mesh the number of sessions can be calculated using x=n(n-1)/2 so for a 1000 routers you would nearly half a million sessions. On the other hand if you use route reflectors to solve the issue of split-horizon the number of sessions would be in the thousands due to clustering. Check CCO for a more detailed explanation.
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