"MPLS Traffic Engineering (MPLS-TE) advertises 32 administrative groups (commonly referred to as ""colors"" or ""link colors"") using the Administrative Group sub-TLV. This is defined for OSPFv2 (RFC 3630)@ OSPFv3 (RFC 5329) and IS-IS (RFC 5305). This document adds a sub-TLV to the IGP TE extensions@ ""Extended Administrative Group"". This sub-TLV provides for additional administrative groups (link colors) beyond the current limit of 32."
RFC 7308-2014 history
2014RFC 7308-2014 Extended Administrative Groups in MPLS Traffic Engineering (MPLS-TE)