MPLS - Abstract Hop Constraints

An abstract hop is a logical combination of the existing traffic engineering constraints, such as administrative groups, extended administrative groups, and Shared Risk Link Groups (SRLGs), which results in a user-defined group or cluster of routers that can be sequenced and used as constraints for setting up an MPLS label-switched path (LSP). Abstract hops overcome the limitations of existing path constraint specifications and provide several benefits to the traffic engineering capabilities of MPLS.