> I am considering the case where there is more than one backbone to provide > BGP/MPLS IP VPNs. The use-case could be purely for administrative > purposes.
If there are multiple backbones (I think you mean multiple VRFs across a single set of physical links here), then there wouldn't be one "RIB" at the "top of the hierarchy." There would be multiple "RIBs," with each one (possibly) bearing the same set of destinations IP address wise, while actually reaching different topological destinations in the network. The only way to make these multiple "RIBs" into a single "RIB," would be to include some form of context identifier, such as a VRF number or RD, to distinguish between the different destinations. Your argument actually argues against a single "RIB" at the top of the hierarchy, rather than for it. :-) Russ _______________________________________________ i2rs mailing list [email protected] https://www.ietf.org/mailman/listinfo/i2rs
