SR

SR is expanded in three ways:

  1. short reach

    An optical interface specification for distances of less than 2 km.

  2. service router

    A network router, for example, the 7750 SR, that supports the creation of IP and MPLS network-layer services such as IES and VPRN services.

  3. segment routing

    Segment routing adds to the IS-IS and OSPF routing protocols the ability to perform shortest path routing and source routing using the concept of abstract segment.