Is it feasible to configure LSPs @ Core Routers levels (P Routers) ?
In which case we have to deploy this solution ?
What's the benifits ?
LDP over RSVP tunnel does this work .
You can run RSVP LSP's between P routers and LDP will be run between PE and P routers and tunneled over RSVP .
Please refer below link for detailed explanation:
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Apart from LDP-over-RSVP tunneling, there is a few more use cases where P routers can be headends/tailends for RSVP LSP:
1/ hierarchical RSVP LSP a.k.a. OSPF forwarding adjacencies
2/ LFA with RSVP LSP as backup paths
3/ TI-FRR a.k.a. LFA with dynamic RSVP LSP a.k.a. LDP link protection