Internet Assigned Numbers Authority
??Domains
??Protocols
??Numbers
??About
Open Shortest Path First v2 (OSPFv2) Parameters
Created
2007-04-25
Last Updated
2025-09-30
Note
Please also see:
[https://www.iana.org/assignments/ospf-authentication-codes]
[https://www.iana.org/assignments/bandwidth-constraints-model-ids]
[https://www.iana.org/assignments/ospf-dd-packet-flags]
[https://www.iana.org/assignments/ospf-lls-tlvs]
[https://www.iana.org/assignments/ospf-opaque-types]
[https://www.iana.org/assignments/ospf-mt-routing]
[https://www.iana.org/assignments/ospf-sig-alg]
[https://www.iana.org/assignments/ospf-traffic-eng-tlvs]
[https://www.iana.org/assignments/ospf-parameters]
Available Formats
[IMG]
XML [IMG]
HTML [IMG]
Plain text
Registries Included Below
??OSPFv2 Options Registry (8 bits)
??OSPF Packet Type (both v2 and v3)
??OSPFv2 Link State (LS) Type
??OSPFv2 Router LSA Link Type (Value 1)
??OSPFv2 Router Properties Registry
??OSPFv2 Grace LSA Top Level TLV
??Path Computation Element (PCE) Capability Flags
??OSPFv2 Instance IDs
??OSPFv2 Extended Prefix Opaque LSA TLVs
??OSPFv2 Extended Prefix TLV Sub-TLVs
??OSPFv2 Extended Prefix TLV Flags
??OSPFv2 Extended Link Opaque LSA TLVs
??OSPFv2 Extended Link TLV Sub-TLVs
??OSPFv2 Extended Inter-Area ASBR TLVs
??OSPFv2 Extended Inter-Area ASBR Sub-TLVs
??IP Algorithm Prefix Reachability Sub-TLV Flags
??OSPFv2 Prefix Extended Flags
OSPFv2 Options Registry (8 bits)
Registration Procedure(s)
Standards Action
Reference
[RFC4940]
Available Formats
[IMG]
CSV
Value Description Reference
0x01 MT-bit [RFC4915]
0x02 E-bit [RFC2328]
0x04 MC-bit [RFC1584][RFC5110]
0x08 N/P-bit [RFC3101]
0x10 L-bit [RFC5613]
0x20 DC-bit [RFC1793]
0x40 O-bit [RFC5250]
0x80 DN-bit [RFC4576]
OSPF Packet Type (both v2 and v3)
Reference
[RFC2328][RFC4940]
Available Formats
[IMG]
CSV
Range Registration Procedures
1-127 Standards Action
128-255 Reserved
Value Description Reference
0 Reserved
1 Hello [RFC2328]
2 Database Description [RFC2328]
3 Link State Request [RFC2328]
4 Link State Update [RFC2328]
5 Link State Ack [RFC2328]
6-127 Unassigned
128-255 Reserved
OSPFv2 Link State (LS) Type
Reference
[RFC2328][RFC4940]
Available Formats
[IMG]
CSV
Range Registration Procedures
1-127 Standards Action
128-255 Reserved
Value Description Reference
0 Reserved [RFC4940]
1 Router-LSA [RFC2328]
2 Network-LSA [RFC2328]
3 Summary-LSA (IP network) [RFC2328]
4 Summary-LSA (ASBR) [RFC2328]
5 AS-external-LSA [RFC2328]
6 Group-membership-LSA [RFC1584][RFC5110]
7 NSSA AS-external LSA [RFC3101]
8 Reserved
9 Link-scoped Opaque LSA [RFC5250]
10 Area-scoped Opaque LSA [RFC5250]
11 AS-scoped Opaque LSA [RFC5250]
12-127 Unassigned
128-255 Reserved
OSPFv2 Router LSA Link Type (Value 1)
Reference
[RFC4940]
Available Formats
[IMG]
CSV
Range Registration Procedures
1-127 Standards Action
128-255 Reserved
Value Description Reference
0 Reserved [RFC4940]
1 Point-to-Point connection to another router [RFC2328]
2 Transit Network [RFC2328]
3 Stub Network [RFC2328]
4 Virtual Link [RFC2328]
OSPFv2 Router Properties Registry
Registration Procedure(s)
Standards Action
Reference
[RFC4940]
Available Formats
[IMG]
CSV
Value Description Reference
0x01 B-bit [RFC2328]
0x02 E-bit [RFC2328]
0x04 V-bit [RFC2328]
0x08 W-bit [RFC1584][RFC5110]
0x10 Nt-bit [RFC3101]
0x80 Host (H-bit) [RFC8770]
OSPFv2 Grace LSA Top Level TLV
Reference
[RFC4940]
Available Formats
[IMG]
CSV
Range Registration Procedures Note
1-255 Standards Action
256-65519 Reserved IANA does not assign
65520-65527 Experimentation IANA does not assign
65528-65535 Vendor Private Use IANA does not assign
Value Description Reference
0 Reserved
1 Grace Period [RFC3623]
2 Graceful Restart reason [RFC3623]
3 IP Interface Address [RFC3623]
4-255 Unassigned
256-65519 Reserved
65520-65527 Experimentation
65528-65535 Vendor Private Use
Path Computation Element (PCE) Capability Flags
Reference
[RFC9353]
Note
Moved to [https://www.iana.org/assignments/igp-parameters]
per [RFC9353].
OSPFv2 Instance IDs
Registration Procedure(s)
Standards Action
Reference
[RFC6549]
Available Formats
[IMG]
CSV
Value Designation Reference
0 Base IPv4 Unicast Instance [RFC6549]
1 Base IPv4 Multicast Instance [RFC6549]
2 Base IPv4 In-band Management Instance [RFC6549]
3-127 Private Use [RFC6549]
128-255 Unassigned
OSPFv2 Extended Prefix Opaque LSA TLVs
Registration Procedure(s)
IETF Review or IESG Approval
Reference
[RFC7684]
Available Formats
[IMG]
CSV
Value Description Reference
0 Reserved [RFC7684]
1 OSPFv2 Extended Prefix TLV [RFC7684]
2 OSPF Extended Prefix Range TLV [RFC8665]
3-32767 Unassigned
32768-33023 Reserved for Experimental Use [RFC7684]
33024-65535 Reserved [RFC7684]
OSPFv2 Extended Prefix TLV Sub-TLVs
Registration Procedure(s)
IETF Review or IESG Approval
Reference
[RFC7684]
Available Formats
[IMG]
CSV
Value Description Reference
0 Reserved [RFC7684]
1 SID/Label Sub-TLV [RFC8665]
2 Prefix-SID Sub-TLV [RFC8665]
3 Flexible Algorithm Prefix Metric (FAPM) [RFC9350, Section 9]
4 Prefix Source OSPF Router-ID [RFC9084]
5 Prefix Source Router Address [RFC9084]
6 OSPFv2 IP Algorithm Prefix Reachability [RFC9502, Section 6.3]
7 OSPFv2 IP Forwarding Address [RFC9502, Section 6.3.1]
8 Unassigned
9 BIER Sub-TLV [RFC8444]
10 BIER MPLS Encapsulation Sub-TLV [RFC8444]
11 OSPFv2 Prefix Extended Flags [RFC9792]
12 BIER PHP Request [RFC-ietf-bier-php-16]
13 Administrative Tag [RFC9825]
14-32767 Unassigned
32768-33023 Reserved for Experimental Use [RFC7684]
33024-65535 Reserved [RFC7684]
OSPFv2 Extended Prefix TLV Flags
Registration Procedure(s)
IETF Review or IESG Approval
Reference
[RFC7684]
Available Formats
[IMG]
CSV
Value Description Reference
0x80 A [RFC7684]
0x40 N [RFC7684]
0x20 E-Flag (ELC Flag) [RFC9089]
OSPFv2 Extended Link Opaque LSA TLVs
Registration Procedure(s)
IETF Review or IESG Approval
Reference
[RFC7684]
Available Formats
[IMG]
CSV
Value Description Reference
0 Reserved [RFC7684]
1 OSPFv2 Extended Link TLV [RFC7684]
2-32767 Unassigned
32768-33023 Reserved for Experimental Use [RFC7684]
33024-65535 Reserved [RFC7684]
OSPFv2 Extended Link TLV Sub-TLVs
Registration Procedure(s)
IETF Review or IESG Approval
Reference
[RFC7684][RFC9356]
Note
The "L2BM" column indicates applicability to the L2 Bundle
Attributes Member sub-TLV. The options for the "L2BM" column are:
Y - This sub-TLV MAY appear in the L2 Bundle Member Attributes
sub-TLV.
N - This sub-TLV MUST NOT appear in the L2 Bundle Member
Attributes sub-TLV.
Available Formats
[IMG]
CSV
Value Designation L2BM Reference
0 Reserved [RFC7684]
1 SID/Label Sub-TLV N [RFC8665]
2 Adj-SID Sub-TLV Y [RFC8665]
3 LAN Adj-SID/Label Sub-TLV Y [RFC8665]
4 Network-to-Router Metric Sub-TLV N [RFC8042]
5 RTM Capability N [RFC8169]
6 OSPFv2 Link MSD N [RFC8476]
7 Graceful-Link-Shutdown Sub-TLV N [RFC8379]
8 Remote IPv4 Address Sub-TLV N [RFC8379]
9 Local/Remote Interface ID Sub-TLV N [RFC8379]
10 Application-Specific Link Attributes Y [RFC9492]
11 Shared Risk Link Group Y [RFC9492]
12 Unidirectional Link Delay Y [RFC9492]
13 Min/Max Unidirectional Link Delay Y [RFC9492]
14 Unidirectional Delay Variation Y [RFC9492]
15 Unidirectional Link Loss Y [RFC9492]
16 Unidirectional Residual Bandwidth Y [RFC9492]
17 Unidirectional Available Bandwidth Y [RFC9492]
18 Unidirectional Utilized Bandwidth Y [RFC9492]
19 Administrative Group Y [RFC9492]
20 Extended Administrative Group Y [RFC9492]
21 OSPFv2 Link Attributes Bits Y [RFC-ietf-lsr-dynamic-flooding-18]
22 TE Metric Y [RFC9492]
23 Maximum link bandwidth Y [RFC9492]
24 L2 Bundle Member Attributes N [RFC9356]
25 Generic Metric Y [RFC9843, Section 2.2]
26-32767 Unassigned
32768-33023 Reserved for Experimental Use [RFC7684]
33024-65535 Reserved [RFC7684]
OSPFv2 Extended Inter-Area ASBR TLVs
Registration Procedure(s)
IETF Review or IESG Approval
Reference
[RFC9350]
Available Formats
[IMG]
CSV
Value Description Reference
0 Reserved [RFC9350]
1 Extended Inter-Area ASBR [RFC9350]
2-32767 Unassigned
32768-33023 Reserved for Experimental Use [RFC9350]
33024-65535 Reserved [RFC9350]
OSPFv2 Extended Inter-Area ASBR Sub-TLVs
Registration Procedure(s)
IETF Review or IESG Approval
Reference
[RFC9350]
Available Formats
[IMG]
CSV
Value Description Reference
0 Reserved [RFC9350]
1 OSPF Flexible Algorithm ASBR Metric [RFC9350]
2 OSPF IP Flexible Algorithm ASBR Metric [RFC9502, Section 6.5]
3-32767 Unassigned
32768-33023 Reserved for Experimental Use [RFC9350]
33024-65535 Reserved [RFC9350]
IP Algorithm Prefix Reachability Sub-TLV Flags
Registration Procedure(s)
IETF Review or IESG Approval
Reference
[RFC9502]
Available Formats
[IMG]
CSV
Bit Name Reference
0 bit E [RFC9502, Section 6.3]
1-7 Unassigned
OSPFv2 Prefix Extended Flags
Registration Procedure(s)
IETF Review
Reference
[RFC9792]
Note
Per [RFC9792], IANA will add
subsequent blocks of 32 bits upon exhaustion of the preceding 32-bit
block.
Available Formats
[IMG]
CSV
Bit Description Reference
0 U-Flag [RFC-ietf-lsr-igp-ureach-prefix-announce-11, Section 4.2]
1 UP-Flag [RFC-ietf-lsr-igp-ureach-prefix-announce-11, Section 4.2]
2-31 Unassigned
Licensing Terms
Presently we were in a very dark road, and at a point where it dropped suddenly between steep sides we halted in black shadow. A gleam of pale sand, a whisper of deep flowing waters, and a farther glimmer of more sands beyond them challenged our advance. We had come to a "grapevine ferry." The scow was on the other side, the water too shoal for the horses to swim, and the bottom, most likely, quicksand. Out of the blackness of the opposite shore came a soft, high-pitched, quavering, long-drawn, smothered moan of woe, the call of that snivelling little sinner the screech-owl. Ferry murmured to me to answer it and I sent the same faint horror-stricken tremolo back. Again it came to us, from not farther than one might toss his cap, and I followed Ferry down to the water's edge. The grapevine guy swayed at our side, we heard the scow slide from the sands, and in a few moments, moved by two videttes, it touched our shore. Soon we were across, the two videttes riding with us, and beyond a sharp rise, in an old opening made by the swoop of a hurricane, we entered the silent unlighted bivouac of Ferry's scouts. Ferry got down and sat on the earth talking with Quinn, while the sergeants quietly roused the sleepers to horse. Plotinus is driven by this perplexity to reconsider the whole theory of Matter.477 He takes Aristotle¡¯s doctrine as the groundwork of his investigation. According to this, all existence is divided into Matter and Form. What we know of things¡ªin other words, the sum of their differential characteristics¡ªis their Form. Take away this, and the unknowable residuum is their Matter. Again, Matter is the vague indeterminate something out of which particular Forms are developed. The two are related as Possibility to Actuality, as the more generic to the more specific substance through every grade of classification and composition. Thus there are two Matters, the one sensible and the other intelligible. The former constitutes the common substratum of bodies, the other the common element of ideas.478 The general distinction between Matter and Form was originally suggested to Aristotle by Plato¡¯s remarks on the same subject; but he differs325 from his master in two important particulars. Plato, in his Timaeus, seems to identify Matter with space.479 So far, it is a much more positive conception than the ?λη of the Metaphysics. On the other hand, he constantly opposes it to reality as something non-existent; and he at least implies that it is opposed to absolute good as a principle of absolute evil.480 Thus while the Aristotelian world is formed by the development of Power into Actuality, the Platonic world is composed by the union of Being and not-Being, of the Same and the Different, of the One and the Many, of the Limit and the Unlimited, of Good and Evil, in varying proportions with each other. The Lawton woman had heard of an officer's family at Grant, which was in need of a cook, and had gone there. [See larger version] On the 8th of July an extraordinary Privy Council was summoned. All the members, of whatever party, were desired to attend, and many were the speculations as to the object of their meeting. The general notion was that it involved the continuing or the ending of the war. It turned out to be for the announcement of the king's intended marriage. The lady selected was Charlotte, the second sister of the Duke of Mecklenburg-Strelitz. Apart from the narrowness of her education, the young princess had a considerable amount of amiability, good sense, and domestic taste. These she shared with her intended husband, and whilst they made the royal couple always retiring, at the same time they caused them to give, during their lives, a moral air to their court. On the 8th of September Charlotte arrived at St. James's, and that afternoon the marriage took place, the ceremony being performed by the Archbishop of Canterbury. On the 22nd the coronation took place with the greatest splendour. Mother and girls were inconsolable, for each had something that they were sure "Si would like," and would "do him good," but they knew Josiah Klegg, Sr., well enough to understand what was the condition when he had once made up his mind. CHAPTER V. THE YOUNG RECRUITS Si proceeded to deftly construct a litter out of the two guns, with some sticks that he cut with a knife, and bound with pawpaw strips. His voice had sunk very low, almost to sweetness. A soft flurry of pink went over her face, and her eyelids drooped. Then suddenly she braced herself, pulled herself taut, grew combative again, though her voice shook. HoME²Ô¾®Ïè̫ʲôÐÇ×ù
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