Internet Assigned Numbers Authority
Interior Gateway Protocol (IGP) Parameters
Created
2017-12-18
Last Updated
2025-09-16
Available Formats
[IMG]
XML [IMG]
HTML [IMG]
Plain text
Registries Included Below
??IGP Algorithm Types
??IGP MSD-Types
??Link Attribute Application Identifiers
??IGP Metric-Type
??IGP Flexible Algorithm Definition Flags
??Path Computation Element (PCE) Capability Flags
??PCE Discovery (PCED) Sub-TLV Type Indicators
??IGP Algorithm Type For Computing Flooding Topology
??IGP Flex-Algorithm Path Computation Rules
IGP Algorithm Types
Registration Procedure(s)
Standards Action
Reference
[RFC8665]
Available Formats
[IMG]
CSV
Value Description Reference
Shortest Path First (SPF) algorithm based on link metric. This is the standard shortest path algorithm as computed
0 by the IGP protocol. Consistent with the deployed practice for link-state protocols, Algorithm 0 permits any node [RFC8665]
to overwrite the SPF path with a different path based on its local policy.
Strict Shortest Path First (SPF) algorithm based on link metric. The algorithm is identical to Algorithm 0 but
1 Algorithm 1 requires that all nodes along the path will honor the SPF routing decision. Local policy at the node [RFC8665]
claiming support for Algorithm 1 MUST NOT alter the SPF paths computed by Algorithm 1.
2-127 Unassigned
128-255 Flexible Algorithms [RFC9350, Section 4]
IGP MSD-Types
Registration Procedure(s)
Expert Review
Expert(s)
Uma Chunduri, Jeff Tantsura
Reference
[RFC8491][RFC9702]
Note
When this registry is modified, the YANG module "iana-msd-type"
must be updated as defined in [RFC9702].
Available Formats
[IMG]
CSV
Value Name Data Plane Reference
0 Reserved [RFC8491]
1 Base MPLS Imposition MSD MPLS [RFC8491]
2 ERLD-MSD MPLS [RFC9088]
3 Readable Label Depth MPLS [RFC9789]
4-40 Unassigned
41 SRH Max SL SRv6 [RFC9352]
42 SRH Max End Pop SRv6 [RFC9352]
43 Unassigned
44 SRH Max H.encaps SRv6 [RFC9352]
45 SRH Max End D SRv6 [RFC9352]
46-250 Unassigned
251-254 Experimental Use [RFC8491]
255 Reserved [RFC8491]
Link Attribute Application Identifiers
Registration Procedure(s)
Expert Review
Expert(s)
Les Ginsberg, Chris Hopps
Reference
[RFC9479]
Available Formats
[IMG]
CSV
Bit Name Reference
0 RSVP-TE (R-bit) [RFC9479]
1 Segment Routing Policy (S-bit) [RFC9479]
2 Loop-Free Alternate (F-bit) [RFC9479]
3 Flexible Algorithm (X-bit) [RFC9350, Section 12]
4-63 Unassigned
IGP Metric-Type
Reference
[RFC9350][RFC9843]
Available Formats
[IMG]
CSV
Range Registration Procedures
0-127 Standards Action
128-255 User-Defined Metric
Type Description Reference Allowed in Generic-Metric
0 IGP Metric [RFC9350, Section 5.1] No
1 Min Unidirectional Link Delay as defined in [RFC8570, Section 4.2] and [RFC7471, [RFC9350, Section 5.1] No
Section 4.2]
2 Traffic Engineering Default Metric as defined in [RFC5305, Section 3.7] and Traffic [RFC9350, Section 5.1] No
Engineering Metric as defined in [RFC3630, Section 2.5.5]
3 Bandwidth Metric [RFC9843] Yes
4-127 Unassigned
128-255 Reserved for User-Defined Metric [RFC9843] Yes
IGP Flexible Algorithm Definition Flags
Registration Procedure(s)
Standards Action
Reference
[RFC9350]
Available Formats
[IMG]
CSV
Bit Name Reference
0 Prefix Metric Flag (M-flag) [RFC9350, Sections 6.4 and 7.4]
Path Computation Element (PCE) Capability Flags
Registration Procedure(s)
IETF Review
Reference
[RFC9353]
Available Formats
[IMG]
CSV
Bit Capability Description Reference
0 Path computation with GMPLS link constraints [RFC5088]
1 Bidirectional path computation [RFC5088]
2 Diverse path computation [RFC5088]
3 Load-balanced path computation [RFC5088]
4 Synchronized paths computation [RFC5088]
5 Support for multiple objective functions [RFC5088]
6 Support for additive path constraints (max hop count, etc.) [RFC5088]
7 Support for request prioritization [RFC5088]
8 Support for multiple requests per message [RFC5088]
9 Global Concurrent Optimization (GCO) [RFC5557]
10 P2MP path computation [RFC8306]
11 Active stateful PCE capability [RFC8231]
12 Passive stateful PCE capability [RFC8231]
13 Active Stateful PCE with P2MP [RFC8623]
14 Passive Stateful PCE with P2MP [RFC8623]
15 Stateful PCE Initiation with P2MP [RFC8623]
16 FlowSpec [RFC9168]
17 TCP-AO Support [RFC9353]
18 PCEP over TLS support [RFC9353]
19-31 Unassigned
PCE Discovery (PCED) Sub-TLV Type Indicators
Registration Procedure(s)
Standards Action
Reference
[RFC9353]
Available Formats
[IMG]
CSV
Value Description Reference
0 Reserved [RFC9353][RFC5088]
1 PCE-ADDRESS [RFC9353][RFC5088]
2 PATH-SCOPE [RFC9353][RFC5088]
3 PCE-DOMAIN [RFC9353][RFC5088]
4 NEIG-PCE-DOMAIN [RFC9353][RFC5088]
5 PCE-CAP-FLAGS [RFC9353][RFC5088]
6 KEY-ID [RFC9353]
7 KEY-CHAIN-NAME [RFC9353]
8-65535 Unassigned
IGP Algorithm Type For Computing Flooding Topology
Registration Procedure(s)
Expert Review
Expert(s)
Unassigned
Reference
[RFC-ietf-lsr-dynamic-flooding-18]
Available Formats
[IMG]
CSV
Value Description Reference
0 Reserved for centralized mode [RFC-ietf-lsr-dynamic-flooding-18]
1-127 Unassigned
128-254 Reserved for Private Use [RFC-ietf-lsr-dynamic-flooding-18]
255 Reserved [RFC-ietf-lsr-dynamic-flooding-18]
IGP Flex-Algorithm Path Computation Rules
Registration Procedure(s)
Expert Review
Expert(s)
Unassigned
Reference
[RFC-ietf-lsr-igp-flex-algo-reverse-affinity-12]
Available Formats
[IMG]
CSV
Sequence Number Description Reference
Check if any exclude Administrative Group rule is part of the
Flex-Algorithm Definition. If such exclude rule exists, check if
1 any color that is part of the exclude rule is also set on the link. [RFC9350, Section 13]
If such a color is set, the link MUST be pruned from the
computation.
Check if any exclude SRLG rule is part of the Flex-Algorithm
2 Definition. If such exclude rule exists, check if the link is part [RFC9350, Section 13]
of any SRLG that is also part of the SRLG exclude rule. If the link
is part of such SRLG, the link MUST be pruned from the computation.
Check if any include-any Administrative Group rule is part of the
Flex-Algorithm Definition. If such include-any rule exists, check
3 if any color that is part of the include-any rule is also set on [RFC9350, Section 13]
the link. If no such color is set, the link MUST be pruned from the
computation.
Check if any include-all Administrative Group rule is part of the
Flex-Algorithm Definition. If such include-all rule exists, check
4 if all colors that are part of the include-all rule are also set on [RFC9350, Section 13]
the link. If all such colors are not set on the link, the link MUST
be pruned from the computation.
If the Flex-Algorithm Definition uses something other than the IGP
metric (Section 5 of [RFC9350]), and such metric is not advertised
5 for the particular link in a topology for which the computation is [RFC9350, Section 13]
done, such link MUST be pruned from the computation. A metric of
value 0 MUST NOT be assumed in such a case.
Check if any exclude FAEMB rule is part of the Flex-Algorithm
definition. If such exclude rule exists and the link has Maximum
6 Link Bandwidth advertised, check if the link bandwidth satisfies [RFC9843, Section 6]
the FAEMB rule. If the link does not satisfy the FAEMB rule, the
link MUST be pruned from the Flex-Algorithm computation.
Check if any exclude FAEMD rule is part of the Flex-Algorithm
definition. If such exclude rule exists and the link has Min
7 Unidirectional link delay advertised, check if the link delay [RFC9843, Section 6]
satisfies the FAEMD rule. If the link does not satisfy the FAEMD
rule, the link MUST be pruned from the Flex-Algorithm computation.
Check if any exclude reverse Admin Group rule is part of the
Flex-Algorithm definition. If such exclude rule exists, check if
8 any Admin Group that is part of the exclude rule is also set on the [RFC-ietf-lsr-igp-flex-algo-reverse-affinity-12, Section 11]
link in the reverse direction. If such Admin Group is set on the
link in the reverse direction, the link MUST be pruned from the
computation.
Check if any include-any reverse Admin Group rule is part of the
Flex-Algorithm definition. If such include-any rule exists, check
9 if any Admin Group that is part of the include-any rule is also set [RFC-ietf-lsr-igp-flex-algo-reverse-affinity-12, Section 11]
on the link in the reverse direction. If no such Admin Group is set
on the link in the reverse direction, the link MUST be pruned from
the computation.
Check if any include-all reverse Admin Group rule is part of the
Flex-Algorithm definition. If such include-all rule exists, check
10 if all Admin Groups that are part of the include-all rule are also [RFC-ietf-lsr-igp-flex-algo-reverse-affinity-12, Section 11]
set on the link in the reverse direction. If all such Admin Groups
are not set on the link in the reverse direction, the link MUST be
pruned from the computation.
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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