IS-IS 2007-11-20 2017-06-23 For IS-IS registries and value ranges maintained via the "Expert Review" registration procedure, guidance for IESG-designated experts can be found in . Chris Hopps, Hannes Gredler, Les Ginsberg 0-3995 Expert Review 3996-4095 Private Use 0 Equivalent to the "standard" topology 1 Reserved for IPv4 in-band management purposes 2 Reserved for IPv6 routing topology 3 Reserved for IPv4 multicast routing topology 4 Reserved for IPv6 multicast routing topology 5 Reserved for IPv6 in-band management purposes 6-3995 Unassigned 3996-4095 Reserved for Private Use