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.