RSVP-TE - Inter-Area LSP

This feature introduces support for interarea traffic engineering for RSVP-TE LSPs, where the device signals a continuous traffic engineered LSP across multiple OSPF areas. The following are the key features of interarea traffic engineering: 

•  Interarea traffic engineering can be enabled when the loose-hop area border routers (ABRs) are configured on the ingress router using CSPF for the Explicit Route Object (ERO) calculation within an OSPF area. ERO expansion is completed on the ABRs. 
•  Interarea traffic engineering can be enabled when CSPF is enabled, but without ABRs specified in the LSP configuration on the ingress router (ABRs can be automatically designated).