Even BGP may experience some growing pains as the core or the regions grow. Keep in mind that a full iBGP mesh is required. Most likely, the core will have a pervasive BGP configuration (which means that all the routers run BGP). Some of the issues that need to be kept in mind with a large number of neighbors include the following:
• BGP update generation
• Loss of information due to aggregation
• Scaling BGP policies
• Scaling IBGP mesh
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