2017-11-08 2023-11-21 Standards Action 2 O (OAM) bit 3 Unassigned 16-19 Unassigned Standards Action 00b Protocol as defined by 01b Reserved 10b Unassigned 11b Unassigned IETF Review 0x0 Reserved 0x1 NSH MD Type 1 0x2 NSH MD Type 2 0x3-0xE Unassigned 0xF Experimentation 0x0000-0x01FF IETF Review 0x0200-0xFFF5 Expert Review Carlos Pignataro, Joel Halpern, Jim Guichard 0x0000 IETF Base NSH MD Class 0x0001-0x01FF Unassigned 0x0200 BBF Specific NSH Metadata 0x0201-0xFFF5 Unassigned 0xFFF6-0xFFFE Experimental 0xFFFF Reserved Standards Action 0x00 Subscriber Identifier 0x01 Performance Policy Identifier 0x02 MAC and Encrypted Metadata #1 0x03 MAC and Encrypted Metadata #2 0x04 Forwarding Context 0x05 Tenant ID 0x06 Ingress Network Node ID 0x07 Ingress Network Interface 0x08 Flow ID 0x09 Source and/or Destination Groups 0x0A Policy ID 0x0B-0xFF Unassigned Expert Review Carlos Pignataro, Joel Halpern, Jim Guichard If the actual assignment of the Next Protocol field allocation reaches half of the range (that is, when there are 128 unassigned values), IANA needs to alert the IESG. At that point, a new more strict allocation policy SHOULD be considered. 0x00 None 0x01 IPv4 0x02 IPv6 0x03 Ethernet 0x04 NSH 0x05 MPLS 0x06 IOAM (Next protocol is an IOAM header) 0x07 SFC Active OAM 0x08-0xFD Unassigned 0xFE Experiment 1 0xFF Experiment 2 IETF Review 0x0 12-bit VLAN identifier 0x1 24-bit double tagging identifiers 0x2 20-bit MPLS VPN label 0x3 24-bit virtual network identifier (VNI) 0x4 32-bit Session ID 0x5-0xE Unassigned 0xF Reserved IETF Review 0x0 20-bit IPv6 Flow Label 0x1 20-bit entropy label in the MPLS network 0x2-0xE Unassigned 0xF Reserved Broadband Forum mailto:help&broadband-forum.org 2019-12-23