RSVP, Resource ReSerVation Protocol

Protocol suite:	TCP/IP.
Type:	Transport layer quality of service signaling protocol.
IP Protocol:	46, 134.
Ports:	363 (UDP) RSVP tunnel; 1698, 1699 encapsulation.
MIME subtype:
SNMP MIBs:	iso.org.dod.internet.mgmt.mib-2.rsvp (1.3.6.1.2.1.51).
Working groups:	issll, Integrated Services over Specific Link Layers. rap, Resource Allocation Protocol. rsvp, Resource Reservation Setup Protocol. Concluded May 2001.
Links:	RSVP parameters.

RFC 2208, page 2:

RSVP is a unicast and multicast signalling protocol, designed to install and maintain reservation state information at each router along the path of a stream of data. The state handled by RSVP is defined by services specified by the Integrated Services WG. These services and RSVP are being introduced to the IETF's standards track jointly. From henceforth, the acronym RSVP on its own is used as a shorthand for the signalling protocol combined with the integrated service specifications.

MAC header

IP header

RSVP header

Data :::

RSVP header:

00	04	08	16
Version	Flags	Message type	RSVP checksum
TTL		0	RSVP length
Data :::

Version. 4 bits.
RSVP version number.

Flags. 4 bits.

00	01	02	03
			R

R, Refresh reduction capable. 1 bit.
Added in RFC 2961.

Value Description

0 Not refresh reduction capable.

1 Refresh reduction capable.

Value	Description
0	Not refresh reduction capable.
1	Refresh reduction capable.

Message type. 8 bits.

Message	Description	References
1	Path.	RFC 2205
2	Resv.	RFC 2205
3	PathErr.	RFC 2205
4	ResvErr.	RFC 2205
5	PathTear.	RFC 2205
6	ResvTear.	RFC 2205
7	ResvConf.	RFC 2205
8	DREQ, Diagnostic Request.	RFC 2745
9	DREP, Diagnostic Reply.	RFC 2745
10	ResvTearConfirm.
11
12	Bundle.	RFC 2961
13	ACK.	RFC 2961
14
15	Srefresh.	RFC 2961
16 - 19
20	Hello.	RFC 3209
21	Notify Message.	RFC 3473
22 23 24
25	Integrity Challenge.	RFC 2747, RFC 3097
26	Integrity Response.	RFC 2747, RFC 3097
27 - 29
30
31 - 65
66	DSBM_willing.
67	I_AM_DSBM.
68 - 255

RSVP checksum. 16 bits.
The one's complement of the one's complement sum of the message, with the checksum field cleared to zero for the purpose of computing the checksum. If cleared to zero, no checksum was transmitted.

TTL, Time to Live. 8 bits.
The IP TTL value with which the message was sent.

RSVP length. 16 bits.
The total length of this RSVP message in bytes, including the common header and the variable length objects that follow.

Data. Variable length.
May contain one or more Objects.

Object:

00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Length																Class								Type
Object contents :::

Length. 16 bits. 0x0004 to 0xFFFC.
The total length of the object in bytes. This value must always be a multiple of 4.

Class. 8 bits.
The object class.

Class	Description	References
0	NULL.	RFC 2205
1	SESSION.	RFC 2205, RFC 2207
2
3	RSVP_HOP.	RFC 2205
4	INTEGRITY.	RFC 2747
5	TIME_VALUES.	RFC 2205
6	ERROR_SPEC.	RFC 2205, RFC 2750
7	SCOPE.	RFC 2205
8	STYLE.	RFC 2205
9	FLOWSPEC.	RFC 2205
10	FILTER_SPEC.	RFC 2205, RFC 2207
11	SENDER_TEMPLATE.	RFC 2205, RFC 2207
12	SENDER_TSPEC.	RFC 2205
13	ADSPEC.	RFC 2205
14	POLICY_DATA.	RFC 2205, RFC 2750
15	RESV_CONFIRM.	RFC 2205
16	RSVP_LABEL.	RFC 3209
17	HOP_COUNT.
18	STRICT_SOURCE_ROUTE.
19	LABEL_REQUEST.	RFC 3209
20	EXPLICIT_ROUTE.	RFC 3209
21	ROUTE_RECORD.	RFC 3209
22	HELLO.	RFC 3209
23	MESSAGE_ID.	RFC 2961
24	MESSAGE_ID_ACK.	RFC 2961
25	MESSAGE_ID_LIST.	RFC 2961
26 - 29
30	DIAGNOSTIC.	RFC 2745
31	ROUTE.	RFC 2745
32	DIAG_RESPONSE.	RFC 2745
33	DIAG_SELECT.	RFC 2745
34	RECOVERY_LABEL.	RFC 3473
35	UPSTREAM_LABEL.	RFC 3473
36	LABEL_SET.	RFC 3473
37	PROTECTION.	RFC 3473, RFC 4872
38	PRIMARY PATH ROUTE.	RFC 4872
39 - 41
42	DSBM IP ADDRESS.
43	SBM_PRIORITY.
44	DSBM TIMER INTERVALS.
45	SBM_INFO.
46 - 49
50	S2L_SUB_LSP.	RFC 4875
51 - 62
63	DETOUR.	RFC 4090
64	CHALLENGE.	RFC 2747
65	DIFF-SERV.	RFC 3270
66	CLASSTYPE.	RFC 4124
67	LSP_REQUIRED_ATTRIBUTES.	RFC 4420
68 - 127
128	NODE_CHAR
129	SUGGESTED_LABEL.
130	ACCEPTABLE_LABEL_SET.
131	RESTART_CAP.
132	SESSION-OF-INTEREST.
133	LINK_CAPABILITY.	RFC 4974
134	Capability Object.
135 - 160
161	RSVP_HOP_L2.
162	LAN_NHOP_L2.
163	LAN_NHOP_L3.
164	LAN_LOOPBACK.
165	TCLASS.
166 - 191
192	TUNNEL.
193	LSP_TUNNEL_INTERFACE_ID.	RFC 3477
194
195	NOTIFY_REQUEST.	RFC 3473
196	ADMIN-STATUS.	RFC 3473, RFC 4872
197	LSP_ATTRIBUTES.	RFC 4420
198	ALARM_SPEC.	RFC 4783
199	ASSOCIATION.	RFC 4872
200	SECONDARY_EXPLICIT_ROUTE.	RFC 4873
201	SECONDARY_RECORD_ROUTE.	RFC 4873
202 - 204
205	FAST_REROUTE.	RFC 4090
206
207	SESSION_ATTRIBUTE.
208 - 224
225	DCLASS.
226	PACKETCABLE EXTENSIONS.
227	ATM_SERVICECLASS.	RFC 3496
228	CALL_OPS (ASON).	RFC 3474
229	GENERALIZED_UNI.	RFC 3476
230	CALL_ID.	RFC 3474
231	3GPP2_Object.
232	EXCLUDE_ROUTE.
233 - 255

Type. 8 bits.
The object type. This is a sub value of the Class.

Class	Class/Type	Description	References
1	0x0101	SESSION, IPv4/UDP.	RFC 2205
1	0x0102	SESSION, IPv6/UDP.	RFC 2205
1	0x0103	SESSION, IPv4/GPI.	RFC 2207
1	0x0104	SESSION, IPv6/GPI.	RFC 2207
1	0x0106	SESSION, tagged_tunnel_IPv4.
1	0x0107	SESSION, LSP Tunnel IPv4.	RFC 3209
1	0x0108	SESSION, LSP Tunnel IPv6.	RFC 3209
1	0x0109	SESSION, RSVP-Aggregate-IPv4.	RFC 3175
1	0x010A	SESSION, RSVP-Aggregate-IPv6.	RFC 3175
1	0x010B	SESSION, UNI_IPv4.
1	0x010C	SESSION, UNI_IPv6 (ASON).	RFC 3474
1	0x010F	SESSION, ENNI_IPv4 (ASON).	RFC 3474
1	0x0110	SESSION, ENNI_IPv6 (ASON).	RFC 3474

3	0x0301	IPv4 RSVP_HOP object.	RFC 2205
3	0x0302	IPv6 RSVP_HOP object.	RFC 2205
4	0x0401	Type 1 Integrity Value.	RFC 2747
5	0x0501	TIME_VALUES object.	RFC 2205
6	0x0601	IPv4 ERROR_SPEC object.	RFC 2205
6	0x0602	IPv6 ERROR_SPEC object.	RFC 2205
7	0x0701	IPv4 SCOPE List object.	RFC 2205
7	0x0702	IPv6 SCOPE List object.	RFC 2205
8	0x0801	Type 1 Style.	RFC 2205
9	0x0901	Reserved (obsolete) flowspec object.	RFC 2205
9	0x0902	Inv-serv Flowspec object.	RFC 2210
9	0x0903	deprecated.
9	0x0904	SONET/SDH FLOWSPEC.	RFC 3946
9	0x0905	G.709.	RFC 4328
10	0x0A01	IPv4 FILTER_SPEC object.	RFC 2205
10	0x0A02	IPv6 FILTER_SPEC object	RFC 2205
10	0x0A03	IPv6 Flow-label FILTER_SPEC object.	RFC 2205
10	0x0A04	IPv4/GPI.	RFC 2207
10	0x0A05	IPv6/GPI.	RFC 2207
10	0x0A06	tagged_tunnel_IPv4.
10	0x0A07	LSP Tunnel IPv4.	RFC 3209
10	0x0A08	LSP Tunnel IPv6.	RFC 3209
11	0x0B01	IPv4 SENDER_TEMPLATE object.	RFC 2205
11	0x0B02	IPv6 SENDER_TEMPLATE object.	RFC 2205
11	0x0B03	IPv6 Flow-label SENDER_TEMPLATE object.	RFC 2205
11	0x0B04	IPv4/GPI.	RFC 2207
11	0x0B05	IPv6/GPI.	RFC 2207
11	0x0B06	tagged_tunnel_IPv4.
11	0x0B07	LSP Tunnel IPv4.	RFC 3209
11	0x0B08	LSP Tunnel IPv6.	RFC 3209
12	0x0C02	Intserv SENDER_TSPEC object.	RFC 2210
12	0x0C03	deprecated.
12	0x0C04	SONET/SDH SENDER_TSPEC.	RFC 3946
12	0x0C05	G.709.	RFC 4328
13	0x0D02	Intserv ADSPEC object.	RFC 2210
14	0x0E01	Type 1 POLICY_DATA object.	RFC 2205, RFC 2750
15	0x0F01	IPv4 RESV_CONFIRM object.	RFC 2205
15	0x0F02	IPv6 RESV_CONFIRM object.	RFC 2205
16	0x1001	Type 1 Label.
17	0x1101	HOP_COUNT, IPv4.
18	0x1201	STRICT_SOURCE_ROUTE, Default.
19	0x1301	Without Label Range.
19	0x1302	With ATM Label Range.
19	0x1303	With Frame Relay Label Range.
20	0x1401	Type 1 Explicit Route.
21	0x1501	Type 1 Route Record.
22	0x1601	Request.
22	0x1602	Acknowledgment.

30	0x1E01	DIAGNOSTIC, IPv4.	RFC 2745
30	0x1E02	DIAGNOSTIC, IPv6.	RFC 2745
31	0x1F01	ROUTE, IPv4.	RFC 2745
31	0x1F02	ROUTE, IPv6.	RFC 2745
32	0x2001	DIAG_RESPONSE, IPv4.	RFC 2745
32	0x2002	DIAG_RESPONSE, IPv6.	RFC 2745
33	0x2101	DIAG_SELECT object.	RFC 2745

42	0x2A01	DSBM IP ADDRESS, IPv4.
42	0x2A02	DSBM IP ADDRESS, IPv6.

43	0x2B01	SBM_PRIORITY, Default.

44	0x2C01	DSBM TIMER INTERVALS, Default.
45	0x2D01	SBM_INFO, Media Type.

64	0x4001	Type 1 Challenge Value.	RFC 2747

65	0x4101	Diff-Serv object for an E-LSP.	RFC 3270
65	0x4102	Diff-Serv object for an L-LSP.	RFC 3270

66	0x4201	Type 1.	RFC 4124

67	0x4301	LSP Required Attributes.	RFC 4420

161	0xA101	RSVP_HOP_L2, IEEE Canonical Address.
162	0xA201	LAN_NHOP_L2, IEEE Canonical Address.
163	0xA301	LAN_NHOP_L3, IPv4.
163	0xA302	LAN_NHOP_L3, IPv6.
164	0xA401	LAN_LOOPBACK, IPv4.
164	0xA402	LAN_LOOPBACK, IPv6.

128	0x8000	NODE_CHAR object	RFC 2746

192	0xC001	TUNNEL, IPv4/UDP.
192	0xC002	TUNNEL, IPv6/UDP.
192	0xC003	TUNNEL, IPv4/GPI.
192	0xC004	TUNNEL, IPv6/GPI.

197	0xC501	LSP Attributess TLVs.	RFC 4420

207	0xCF01	LSP_TUNNEL_RA.
207	0xCF07	LSP Tunnel.

228	0xE401	CALL_OPS, Type 1.	RFC 3474

230	0xE601	CALL_ID, Operator specific.	RFC 3474
230	0xE602	CALL_ID, Globally unique.	RFC 3474

Object contents. Variable length.

Glossary:

RFCs:

[RFC 1633] Integrated Services in the Internet Architecture: an Overview.

[RFC 2113] IP Router Alert Option.

Category: Standards Track.
Defines IP option 20 (Router Alert).

[RFC 2205] Resource ReSerVation Protocol (RSVP) -- Version 1 Functional Specification.

Updated by: RFC 3936.

[RFC 2206] RSVP Management Information Base using SMIv2.

Defines SNMP MIB iso.org.dod.internet.mgmt.mib-2.rsvp (1.3.6.1.2.1.51).

[RFC 2207] RSVP Extensions for IPSEC Data Flows.

[RFC 2208] Resource ReSerVation Protocol (RSVP) Version 1 Applicability Statement. Some Guidelines on Deployment.

[RFC 2209] Resource ReSerVation Protocol (RSVP) -- Version 1 Message Processing Rules.

[RFC 2210] The Use of RSVP with IETF Integrated Services.

[RFC 2379] RSVP over ATM Implementation Guidelines.

[RFC 2380] RSVP over ATM Implementation Requirements.

[RFC 2382] A Framework for Integrated Services and RSVP over ATM.

[RFC 2490] A Simulation Model for IP Multicast with RSVP.

[RFC 2745] RSVP Diagnostic Messages.

[RFC 2746] RSVP Operation Over IP Tunnels.

[RFC 2747] RSVP Cryptographic Authentication.

[RFC 2749] COPS usage for RSVP.

[RFC 2750] RSVP Extensions for Policy Control.

Updates: RFC 2205.

[RFC 2753] A Framework for Policy-based Admission Control.

[RFC 2814] SBM (Subnet Bandwidth Manager): A Protocol for RSVP-based Admission Control over IEEE 802-style networks.

[RFC 2815] Integrated Service Mappings on IEEE 802 Networks.

[RFC 2961] RSVP Refresh Overhead Reduction Extensions.

[RFC 2996] Format of the RSVP DCLASS Object.

[RFC 2997] Specification of the Null Service Type.

[RFC 2998] A Framework for Integrated Services Operation over Diffserv Networks.

[RFC 3027] Protocol Complications with the IP Network Address Translator.

[RFC 3097] RSVP Cryptographic Authentication -- Updated Message Type Value.

[RFC 3175] Aggregation of RSVP for IPv4 and IPv6 Reservations.

[RFC 3181] Signaled Preemption Priority Policy Element.

Obsoletes: RFC 2751.

[RFC 3182] Identity Representation for RSVP.

Obsoletes: RFC 2752.

[RFC 3209] RSVP-TE: Extensions to RSVP for LSP Tunnels.

Category: Standards Track.
Updated by:
RFC 3936, RFC 4420.

[RFC 3210] Applicability Statement for Extensions to RSVP for LSP-Tunnels.

[RFC 3270] Multi-Protocol Label Switching (MPLS) Support of Differentiated Services.

[RFC 3473] Generalized Multi-Protocol Label Switching (GMPLS) Signaling Resource ReserVation Protocol-Traffic Engineering (RSVP-TE) Extensions.

Category: Standards Track.
Updated by:
RFC 4003, RFC 4201, RFC 4420.

[RFC 3474] Documentation of IANA assignments for Generalized MultiProtocol Label Switching (GMPLS) Resource Reservation Protocol - Traffic Engineering (RSVP-TE) Usage and Extensions for Automatically Switched Optical Network (ASON).

Defines RSVP classes 228 (CALL_OPS) and 230 (CALL_ID).

[RFC 3476] Documentation of IANA Assignments for Label Distribution Protocol (LDP), Resource ReSerVation Protocol (RSVP), and Resource ReSerVation Protocol-Traffic Engineering (RSVP-TE) Extensions for Optical UNI Signaling.

Defines RSVP class 229 (GENERALIZED_UNI).

[RFC 3477] Signalling Unnumbered Links in Resource ReSerVation Protocol - Traffic Engineering (RSVP-TE).

Defines RSVP class 193 (LSP_TUNNEL_INTERFACE_ID).

[RFC 3496] Protocol Extension for Support of Asynchronous Transfer Mode (ATM) Service Class-aware Multiprotocol Label Switching (MPLS) Traffic Engineering.

Defines RSVP class 227 (ATM_SERVICECLASS).

[RFC 3520] Session Authorization Policy Element.

[RFC 3936] Procedures for Modifying the Resource reSerVation Protocol (RSVP).

BCP: 96.
Updates: RFC 2205, RFC 3209.

[RFC 3946] Generalized Multi-Protocol Label Switching (GMPLS) Extensions for Synchronous Optical Network (SONET) and Synchronous Digital Hierarchy (SDH) Control.

Defines CR-LDP TLV 0x0838 (SONET/SDH Traffic Parameters).
Defines RSVP 0x0904 (SONET/SDH FLOWSPEC) and 0x0C04 (SONET/SDH SENDER_TSPEC).

[RFC 4090] Fast Reroute Extensions to RSVP-TE for LSP Tunnels.

Category: Standards Track.
Defines RSVP class 63 (DETOUR) and 205 (FAST_REROUTE).

[RFC 4094] Analysis of Existing Quality-of-Service Signaling Protocols.

Category: Informational.

[RFC 4124] Protocol Extensions for Support of Diffserv-aware MPLS Traffic Engineering.

Category: Standards Track.
Defines IS-IS sub-TLV (22, 22) Bandwidth Constraints.
Defines OSPF sub-TLV (2, 17) Bandwidth Contraints.
Defines RSVP class 66 (CLASSTYPE).

[RFC 4208] Generalized Multiprotocol Label Switching (GMPLS) User-Network Interface (UNI): Resource ReserVation Protocol-Traffic Engineering (RSVP-TE) Support for the Overlay Model.

Category: Standards Track.

[RFC 4230] RSVP Security Properties.

Category: Informational.

[RFC 4328] Generalized Multi-Protocol Label Switching (GMPLS) Signaling Extensions for G.709 Optical Transport Networks Control.

Category: Standards Track.
Defines RSVP 0x0905 (G.709) and 0x0C05 (G.709).
Updates: RFC 3471.

[RFC 4420] Encoding of Attributes for Multiprotocol Label Switching (MPLS) Label Switched Path (LSP) Establishment Using Resource ReserVation Protocol-Traffic Engineering (RSVP-TE).

Category: Standards Track.
Defines RSVP classes 67 (LSP Required Attributes), 197 (LSP Attributes).
Updates:
RFC 3209, RFC 3473.

Obsolete RFCs:

[RFC 2751] Signaled Preemption Priority Policy Element.

Category: Standards Track.
Obsoleted by:
RFC 3181.

[RFC 2752] Identity Representation for RSVP.

Category: Standards Track.
Obsoleted by:
RFC 3182.