Sorry to bring up an old thread again, but I just remembered that Cisco put out a so-called "Label Switch Processor".
http://www.cisco.com/en/US/prod/collateral/routers/ps5763/data_sheet_c78-659947.html The LSP (Cisco may have intended for the pun) is "optimized" for CRS routers being run as pure label switch routers. We're buying the FP-40's and FP-140's which have a mix of IP and MPLS capabilities, so I haven't really tested the new LSP-140 to know how it stacks up in all scenarios, particularly if the CRS would be performing PHP for some or all FEC's. Cisco are certainly thinking about this, but perhaps not from a full chassis perspective like Juniper's PTX. Cheers, Mark.
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