The mobile cell router is not a pure IP router anymore but it’s a small scale MPLS PE (ASR903/920/…)
The L2 aggregation switch is now an MPLS P router
The former PE is now Area Border Router and its role is stitching access MPLS areas into H-MPLS core in a “Hierarchical” fashion, so that the IGP/LDP on H-MPLS P routers doesn’t need to learn the loopbacks of all the 100,000s of (“PE”)Mobile-Cell-routers and P routers from all these access areas –as the IP reachability and label information for nodes in these IGP areas that are separated from H-MPLS core IGP is now carried in BGP-LU and only between ABRs creating this scalable MPLS hierarchy.
This hierarchical MPLS is a very old concept used for ages In Inter-AS MPLS VPNs option C deployments –that was somewhat shoehorned into single-AS or even single IGP(multi-area/level) deployments.
And solving problems with yet another layer of indirection is an ancient concept :)
::carrier-class solutions for the telecommunications industry::
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