@techreport{ietf-idr-bgp-nh-cost-03, number = {draft-ietf-idr-bgp-nh-cost-03}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-nh-cost/03/}, author = {Ilya Varlashkin and Robert Raszuk and Keyur Patel and Manish Bhardwaj and Serpil Bayraktar}, title = {{Carrying next-hop cost information in BGP}}, pagetotal = 10, year = 2021, month = nov, day = 30, abstract = {BGPLS provides a mechanism by which Link state and traffic engineering information can be collected from internal networks and shared with external network routers using BGP. BGPLS defines a new Address Family to exchange this information using BGP. BGP Optimal Route Reflection {[}BGP-ORR{]} {[}RFC9107{]} provides a mechanism for a centralized BGP Route Reflector to acheive requirements of a Hot Potato Routing as described in Section 11 of {[}RFC4456{]}. Optimal Route Reflection requires BGP ORR to overwrite the default IGP location placement of the route reflector; which is used for determining cost to the nexthop contained in the path. This draft augments BGPLS and defines a new extensions to exchange cost information to next-hops for the purpose of calculating best path from a peer perspective rather than local BGP speaker own perspective.}, }