Segment Routing

Created
2021-01-08
Last Updated
2025-09-16
Available Formats

XML
HTML
Plain text

Registries Included Below

SRv6 Endpoint Behaviors

Reference
[RFC8986]
Available Formats

CSV
Range Registration Procedures Note
0 Reserved Not to be allocated
1-32767 First Come First Served
32768-34815 Private Use
34816-65534 Reserved
65535 Reserved Opaque
Value Hex Endpoint Behavior Reference Change Controller
0 0x0000 Reserved [RFC8986] IETF
1 0x0001 End [RFC8986] IETF
2 0x0002 End with PSP [RFC8986] IETF
3 0x0003 End with USP [RFC8986] IETF
4 0x0004 End with PSP & USP [RFC8986] IETF
5 0x0005 End.X [RFC8986] IETF
6 0x0006 End.X with PSP [RFC8986] IETF
7 0x0007 End.X with USP [RFC8986] IETF
8 0x0008 End.X with PSP & USP [RFC8986] IETF
9 0x0009 End.T [RFC8986] IETF
10 0x000A End.T with PSP [RFC8986] IETF
11 0x000B End.T with USP [RFC8986] IETF
12 0x000C End.T with PSP & USP [RFC8986] IETF
13 0x000D End.B6.Insert [draft-filsfils-spring-srv6-net-pgm-insertion-04] [Pablo_Camarillo]
14 0x000E End.B6.Encaps [RFC8986] IETF
15 0x000F End.BM [RFC8986] IETF
16 0x0010 End.DX6 [RFC8986] IETF
17 0x0011 End.DX4 [RFC8986] IETF
18 0x0012 End.DT6 [RFC8986] IETF
19 0x0013 End.DT4 [RFC8986] IETF
20 0x0014 End.DT46 [RFC8986] IETF
21 0x0015 End.DX2 [RFC8986] IETF
22 0x0016 End.DX2V [RFC8986] IETF
23 0x0017 End.DT2U [RFC8986] IETF
24 0x0018 End.DT2M [RFC8986] IETF
25 0x0019 Reserved [RFC8986] IETF
26 0x001A End.B6.Insert.Red [draft-filsfils-spring-srv6-net-pgm-insertion-04] [Pablo_Camarillo]
27 0x001B End.B6.Encaps.Red [RFC8986] IETF
28 0x001C End with USD [RFC8986] IETF
29 0x001D End with PSP & USD [RFC8986] IETF
30 0x001E End with USP & USD [RFC8986] IETF
31 0x001F End with PSP, USP & USD [RFC8986] IETF
32 0x0020 End.X with USD [RFC8986] IETF
33 0x0021 End.X with PSP & USD [RFC8986] IETF
34 0x0022 End.X with USP & USD [RFC8986] IETF
35 0x0023 End.X with PSP, USP & USD [RFC8986] IETF
36 0x0024 End.T with USD [RFC8986] IETF
37 0x0025 End.T with PSP & USD [RFC8986] IETF
38 0x0026 End.T with USP & USD [RFC8986] IETF
39 0x0027 End.T with PSP, USP & USD [RFC8986] IETF
40 0x0028 End.MAP [RFC9433] IETF
41 0x0029 End.Limit [RFC9433] IETF
42 0x002A End with NEXT-ONLY-CSID [draft-filsfils-spring-net-pgm-extension-srv6-usid-10] [Pablo_Camarillo]
43 0x002B End with NEXT-CSID [RFC9800] IETF
44 0x002C End with NEXT-CSID & PSP [RFC9800] IETF
45 0x002D End with NEXT-CSID & USP [RFC9800] IETF
46 0x002E End with NEXT-CSID, PSP & USP [RFC9800] IETF
47 0x002F End with NEXT-CSID & USD [RFC9800] IETF
48 0x0030 End with NEXT-CSID, PSP & USD [RFC9800] IETF
49 0x0031 End with NEXT-CSID, USP & USD [RFC9800] IETF
50 0x0032 End with NEXT-CSID, PSP, USP & USD [RFC9800] IETF
51 0x0033 End.X with NEXT-ONLY-CSID [draft-filsfils-spring-net-pgm-extension-srv6-usid-10] [Pablo_Camarillo]
52 0x0034 End.X with NEXT-CSID [RFC9800] IETF
53 0x0035 End.X with NEXT-CSID & PSP [RFC9800] IETF
54 0x0036 End.X with NEXT-CSID & USP [RFC9800] IETF
55 0x0037 End.X with NEXT-CSID, PSP & USP [RFC9800] IETF
56 0x0038 End.X with NEXT-CSID & USD [RFC9800] IETF
57 0x0039 End.X with NEXT-CSID, PSP & USD [RFC9800] IETF
58 0x003A End.X with NEXT-CSID, USP & USD [RFC9800] IETF
59 0x003B End.X with NEXT-CSID, PSP, USP & USD [RFC9800] IETF
60 0x003C uDX6 (End.DX6 with NEXT-CSID) [RFC9800] [Pablo_Camarillo]
61 0x003D uDX4 (End.DX4 with NEXT-CSID) [RFC9800] [Pablo_Camarillo]
62 0x003E uDT6 (End.DT6 with NEXT-CSID) [RFC9800] [Pablo_Camarillo]
63 0x003F uDT4 (End.DT4 with NEXT-CSID) [RFC9800] [Pablo_Camarillo]
64 0x0040 uDT46 (End.DT46 with NEXT-CSID) [RFC9800] [Pablo_Camarillo]
65 0x0041 uDX2 (End.DX2 with NEXT-CSID) [RFC9800] [Pablo_Camarillo]
66 0x0042 uDX2V (End.DX2V with NEXT-CSID) [RFC9800] [Pablo_Camarillo]
67 0x0043 uDT2U (End.DT2U with NEXT-CSID) [RFC9800] [Pablo_Camarillo]
68 0x0044 uDT2M (End.DT2M with NEXT-CSID) [RFC9800] [Pablo_Camarillo]
69 0x0045 End.M.GTP6.D [RFC9433] IETF
70 0x0046 End.M.GTP6.Di [RFC9433] IETF
71 0x0047 End.M.GTP6.E [RFC9433] IETF
72 0x0048 End.M.GTP4.E [RFC9433] IETF
73 0x0049 End.DTM [draft-agrawal-spring-srv6-mpls-interworking-05] [Pablo_Camarillo]
74 0x004A End.M (Mirror SID) [draft-ietf-rtgwg-srv6-egress-protection-02] IETF
75 0x004B End.Replicate [RFC9524] IETF
76 0x004C End.DTMC4 [draft-ietf-bess-mvpn-evpn-sr-p2mp-06] [Rishabh_Parekh]
77 0x004D End.DTMC6 [draft-ietf-bess-mvpn-evpn-sr-p2mp-06] [Rishabh_Parekh]
78 0x004E End.DTMC46 [draft-ietf-bess-mvpn-evpn-sr-p2mp-06] [Rishabh_Parekh]
79 0x004F End.BXC [draft-han-spring-srv6-underlay-tunnel-programming-02] [Ran_Chen]
80 0x0050 End.BXC with PSP [draft-han-spring-srv6-underlay-tunnel-programming-02] [Ran_Chen]
81 0x0051 End.BXC with USP [draft-han-spring-srv6-underlay-tunnel-programming-02] [Ran_Chen]
82 0x0052 End.BXC with USD [draft-han-spring-srv6-underlay-tunnel-programming-02] [Ran_Chen]
83 0x0053 End.BXC with PSP, USP & USD [draft-han-spring-srv6-underlay-tunnel-programming-02] [Ran_Chen]
84 0x0054 End.NSH - NSH Segment [RFC9491] IETF
85 0x0055 End.T with NEXT-CSID [RFC9800] IETF
86 0x0056 End.T with NEXT-CSID & PSP [RFC9800] IETF
87 0x0057 End.T with NEXT-CSID & USP [RFC9800] IETF
88 0x0058 End.T with NEXT-CSID, PSP & USP [RFC9800] IETF
89 0x0059 End.T with NEXT-CSID & USD [RFC9800] IETF
90 0x005A End.T with NEXT-CSID, PSP & USD [RFC9800] IETF
91 0x005B End.T with NEXT-CSID, USP & USD [RFC9800] IETF
92 0x005C End.T with NEXT-CSID, PSP, USP & USD [RFC9800] IETF
93 0x005D End.B6.Encaps with NEXT-CSID [RFC9800] IETF
94 0x005E End.B6.Encaps.Red with NEXT-CSID [RFC9800] IETF
95 0x005F End.BM with NEXT-CSID [RFC9800] IETF
96 0x0060 End.LBS with NEXT-CSID [RFC9800] IETF
97 0x0061 End.XLBS with NEXT-CSID [RFC9800] IETF
98 0x0062 End.B6.Encaps.Red with NEXT-CSID, PSP & USD [Pablo_Camarillo] [Pablo_Camarillo]
99 0x0063 End.B6.Insert.Red with NEXT-CSID, PSP & USD [Pablo_Camarillo] [Pablo_Camarillo]
100 0x0064 End.PSID [draft-ietf-spring-srv6-path-segment-02] [Cheng_Li]
101 0x0065 End with REPLACE-CSID [RFC9800] IETF
102 0x0066 End with REPLACE-CSID & PSP [RFC9800] IETF
103 0x0067 End with REPLACE-CSID & USP [RFC9800] IETF
104 0x0068 End with REPLACE-CSID, PSP & USP [RFC9800] IETF
105 0x0069 End.X with REPLACE-CSID [RFC9800] IETF
106 0x006A End.X with REPLACE-CSID & PSP [RFC9800] IETF
107 0x006B End.X with REPLACE-CSID & USP [RFC9800] IETF
108 0x006C End.X with REPLACE-CSID, PSP & USP [RFC9800] IETF
109 0x006D End.T with REPLACE-CSID [RFC9800] IETF
110 0x006E End.T with REPLACE-CSID & PSP [RFC9800] IETF
111 0x006F End.T with REPLACE-CSID & USP [RFC9800] IETF
112 0x0070 End.T with REPLACE-CSID, PSP & USP [RFC9800] IETF
113 0x0071 Unassigned
114 0x0072 End.B6.Encaps with REPLACE-CSID [RFC9800] IETF
115 0x0073 End.BM with REPLACE-CSID [RFC9800] IETF
116 0x0074 End.DX6 with REPLACE-CSID [RFC9800] IETF
117 0x0075 End.DX4 with REPLACE-CSID [RFC9800] IETF
118 0x0076 End.DT6 with REPLACE-CSID [RFC9800] IETF
119 0x0077 End.DT4 with REPLACE-CSID [RFC9800] IETF
120 0x0078 End.DT46 with REPLACE-CSID [RFC9800] IETF
121 0x0079 End.DX2 with REPLACE-CSID [RFC9800] IETF
122 0x007A End.DX2V with REPLACE-CSID [RFC9800] IETF
123 0x007B End.DT2U with REPLACE-CSID [RFC9800] IETF
124 0x007C End.DT2M with REPLACE-CSID [RFC9800] IETF
125-126 0x007D-0x007E Unassigned
127 0x007F End.B6.Encaps.Red with REPLACE-CSID [RFC9800] IETF
128 0x0080 End with REPLACE-CSID & USD [RFC9800] IETF
129 0x0081 End with REPLACE-CSID, PSP & USD [RFC9800] IETF
130 0x0082 End with REPLACE-CSID, USP & USD [RFC9800] IETF
131 0x0083 End with REPLACE-CSID, PSP, USP & USD [RFC9800] IETF
132 0x0084 End.X with REPLACE-CSID & USD [RFC9800] IETF
133 0x0085 End.X with REPLACE-CSID, PSP & USD [RFC9800] IETF
134 0x0086 End.X with REPLACE-CSID, USP & USD [RFC9800] IETF
135 0x0087 End.X with REPLACE-CSID, PSP, USP & USD [RFC9800] IETF
136 0x0088 End.T with REPLACE-CSID & USD [RFC9800] IETF
137 0x0089 End.T with REPLACE-CSID, PSP & USD [RFC9800] IETF
138 0x008A End.T with REPLACE-CSID, USP & USD [RFC9800] IETF
139 0x008B End.T with REPLACE-CSID, PSP, USP & USD [RFC9800] IETF
140 0x008C End.LBS with REPLACE-CSID [RFC9800] IETF
141 0x008D End.XLBS with REPLACE-CSID [RFC9800] IETF
142-149 0x008E-0x0095 Unassigned
150 0x0096 End.XU [draft-dong-spring-srv6-inter-layer-programming-04] [Jie_Dong]
151 0x0097 End.XU with PSP [draft-dong-spring-srv6-inter-layer-programming-04] [Jie_Dong]
152 0x0098 End.XU with USP [draft-dong-spring-srv6-inter-layer-programming-04] [Jie_Dong]
153 0x0099 End.XU with USD [draft-dong-spring-srv6-inter-layer-programming-04] [Jie_Dong]
154 0x009A End.XU with PSP, USP & USD [draft-dong-spring-srv6-inter-layer-programming-04] [Jie_Dong]
155 0x009B End.XU with REPPLACE-CSID [draft-dong-spring-srv6-inter-layer-programming-04] [Jie_Dong]
156 0x009C End.XU with REPPLACE-CSID & PSP [draft-dong-spring-srv6-inter-layer-programming-04] [Jie_Dong]
157 0x009D End.XU with REPPLACE-CSID & PSP & USP & USD [draft-dong-spring-srv6-inter-layer-programming-04] [Jie_Dong]
158 0x009E End.DX1 [RFC9801] IETF
159 0x009F End.DX1 with NEXT-CSID [RFC9801] IETF
160 0x00A0 End.DX1 with REPLACE-CSID [RFC9801] IETF
161 0x00A1 End.AN - SR-aware function [draft-ietf-spring-sr-service-programming-10] [Francois_Clad]
162 0x00A2 End.AS - Static proxy [draft-ietf-spring-sr-service-programming-10] [Francois_Clad]
163 0x00A3 End.AD - Dynamic proxy [draft-ietf-spring-sr-service-programming-10] [Francois_Clad]
164 0x00A4 End.AM - Masquerading proxy [draft-ietf-spring-sr-service-programming-10] [Francois_Clad]
165 0x00A5 End.AM - Masquerading proxy with NAT [draft-ietf-spring-sr-service-programming-10] [Francois_Clad]
166 0x00A6 End.AM - Masquerading proxy with Caching [draft-ietf-spring-sr-service-programming-10] [Francois_Clad]
167 0x00A7 End.AM - Masquerading proxy with NAT & Caching [draft-ietf-spring-sr-service-programming-10] [Francois_Clad]
168 0x00A8 End.M.GTP6.E.Red [draft-kawakami-dmm-srv6-gtp6e-reduced-02] [Yuya_Kawakami]
169 0x00A9 End.AN.CI.S [draft-lin-spring-srv6-aware-context-indicator-04] [Jiaming_Ye]
170 0x00AA End.AN.CI.D.A [draft-lin-spring-srv6-aware-context-indicator-04] [Jiaming_Ye]
171 0x00AB End.AN.CI.D.T [draft-lin-spring-srv6-aware-context-indicator-04] [Jiaming_Ye]
172 0x00AC End.AN.CI.D.V [draft-lin-spring-srv6-aware-context-indicator-04] [Jiaming_Ye]
173 0x00AD End.AN.CI.D.D [draft-lin-spring-srv6-aware-context-indicator-04] [Jiaming_Ye]
174-179 0x00AE-0x00B3 Unassigned
180 0x00B4 End.AS with REPLACE-CSID [draft-lh-spring-srv6-sfc-csid-04] [Cheng_Li]
181 0x00B5 End.AS with NEXT-CSID [draft-lh-spring-srv6-sfc-csid-04] [Cheng_Li]
182 0x00B6 End.AD with REPLACE-CSID [draft-lh-spring-srv6-sfc-csid-04] [Cheng_Li]
183 0x00B7 End.AD with NEXT-CSID [draft-lh-spring-srv6-sfc-csid-04] [Cheng_Li]
184 0x00B8 End.AM with REPLACE-CSID [draft-lh-spring-srv6-sfc-csid-04] [Cheng_Li]
185 0x00B9 End.AM with NEXT-CSID [draft-lh-spring-srv6-sfc-csid-04] [Cheng_Li]
186 0x00BA End.AMN with REPLACE-CSID [draft-lh-spring-srv6-sfc-csid-04] [Cheng_Li]
187 0x00BB End.AMN with NEXT-CSID [draft-lh-spring-srv6-sfc-csid-04] [Cheng_Li]
188-32766 0x00BC-0x7FFE Unassigned
32767 0x7FFF The SID defined in [RFC8754] [RFC8986][RFC8754] IETF
32768-34815 0x8000-0x87FF Reserved for Private Use [RFC8986] IETF
34816-65534 0x8800-0xFFFE Reserved [RFC8986] IETF
65535 0xFFFF Opaque [RFC8986] IETF

Segment Types

Registration Procedure(s)
Specification Required
Expert(s)
Ketan Talaulikar, Matthew Bocci
Reference
[RFC9256]
Available Formats

CSV
Value Description Reference
A SR-MPLS Label [RFC9256]
B SRv6 SID [RFC9256]
C IPv4 Prefix with optional SR Algorithm [RFC9256]
D IPv6 Global Prefix with optional SR Algorithm for SR-MPLS [RFC9256]
E IPv4 Prefix with Local Interface ID [RFC9256]
F IPv4 Addresses for link endpoints as Local, Remote pair [RFC9256]
G IPv6 Prefix and Interface ID for link endpoints as Local, Remote pair for SR-MPLS [RFC9256]
H IPv6 Addresses for link endpoints as Local, Remote pair for SR-MPLS [RFC9256]
I IPv6 Global Prefix with optional SR Algorithm for SRv6 [RFC9256]
J IPv6 Prefix and Interface ID for link endpoints as Local, Remote pair for SRv6 [RFC9256]
K IPv6 Addresses for link endpoints as Local, Remote pair for SRv6 [RFC9256]

SR Policy ENLP Values

Registration Procedure(s)
Standards Action
Reference
[RFC9830]
Available Formats

CSV
Code Point Description Reference
0 Reserved [RFC9830]
1 Push an IPv4 Explicit NULL label on an unlabeled IPv4 packet but do not push an IPv6 Explicit NULL label on an unlabeled IPv6 packet [RFC9830]
2 Push an IPv6 Explicit NULL label on an unlabeled IPv6 packet but do not push an IPv4 Explicit NULL label on an unlabeled IPv4 packet [RFC9830]
3 Push an IPv6 Explicit NULL label on an unlabeled IPv6 packet and push an IPv4 Explicit NULL label on an unlabeled IPv4 packet [RFC9830]
4 Do not push an Explicit NULL label [RFC9830]
5-255 Unassigned

SR Policy Protocol Origin

Expert(s)
Unassigned
Reference
[RFC-ietf-idr-bgp-ls-sr-policy-17]
Available Formats

CSV
Range Registration Procedures
1-250 Expert Review
251-255 Private Use
Code Point Protocol Origin Reference Change Controller
0 Reserved [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF
1 PCEP [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF
2 BGP SR Policy [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF
3 Configuration (CLI, YANG model via NETCONF, etc.) [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF
4-9 Unassigned
10 PCEP (In PCEP or when BGP-LS Producer is PCE) [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF
11-19 Unassigned
20 BGP SR Policy (In PCEP or when BGP-LS Producer is PCE) [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF
21-29 Unassigned
30 Configuration (CLI, YANG model via NETCONF, etc.) (In PCEP or when BGP-LS Producer is PCE) [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF
31-250 Unassigned
251-255 Reserved for Private Use [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF

Contact Information

ID Name Contact URI Last Updated
[Cheng_Li] Cheng Li mailto:c.l&huawei.com 2025-04-25
[Francois_Clad] Francois Clad mailto:fclad.ietf&gmail.com 2024-01-18
[Jiaming_Ye] Jiaming Ye mailto:yejiaming&chinamobile.com 2025-02-28
[Jie_Dong] Jie Dong mailto:jie.dong&huawei.com 2022-10-14
[Pablo_Camarillo] Pablo Camarillo mailto:pcamaril&cisco.com 2023-01-13
[Ran_Chen] Ran Chen mailto:chen.ran&zte.com.cn 2022-11-23
[Rishabh_Parekh] Rishabh Parekh mailto:riparekh&cisco.com 2022-07-05
[Yuya_Kawakami] Yuya Kawakami mailto:yuyarin&yuyarin.net 2025-02-17