%% You should probably cite draft-li-lsr-isis-hierarchical-isis instead of this I-D. @techreport{li-hierarchical-isis-00, number = {draft-li-hierarchical-isis-00}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-li-hierarchical-isis/00/}, author = {Tony Li}, title = {{Hierarchical IS-IS}}, pagetotal = 7, year = 2018, month = jun, day = 29, abstract = {The IS-IS routing protocol was originally defined with a two level hierarchical structure. This was adequate for the networks at the time. As we continue to expand the scale of our networks, it is apparent that additional hierarchy would be a welcome degree of flexibility in network design. This document defines IS-IS Levels 3 through 8.}, }