IS‑IS
E181693
IS-IS (Intermediate System to Intermediate System) is a link-state interior gateway routing protocol used to efficiently route IP traffic within large service provider and enterprise networks.
All labels observed (8)
| Label | Occurrences |
|---|---|
| IS-IS | 7 |
| IS-IS routing protocol | 2 |
| Intermediate System to Intermediate System | 2 |
| Designated Intermediate System | 1 |
| IS‑IS canonical | 1 |
| Multi-Topology IS-IS | 1 |
| OSI IS-IS | 1 |
| Use of OSI IS-IS for Routing in TCP/IP and Dual Environments | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1590464 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: IS‑IS Context triple: [Cisco Nexus switches, supportsProtocol, IS‑IS]
-
A.
IS-IS for IPv6
IS-IS for IPv6 is an extension of the IS-IS interior gateway routing protocol that enables dynamic routing and topology discovery in IPv6 networks.
-
B.
OSPF
OSPF (Open Shortest Path First) is a widely used interior gateway routing protocol that employs link-state information to determine the most efficient path for data within an IP network.
-
C.
OSPFv3
OSPFv3 is the version of the Open Shortest Path First routing protocol designed to operate over IPv6 networks, providing link-state routing and support for IPv6 addressing and features.
-
D.
EIGRP
EIGRP (Enhanced Interior Gateway Routing Protocol) is a Cisco-developed advanced distance-vector routing protocol used to efficiently route IP traffic within large enterprise networks.
-
E.
BGP
BGP (Border Gateway Protocol) is the primary inter-domain routing protocol used to exchange routing information and determine paths between autonomous systems on the global Internet.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: IS‑IS Target entity description: IS-IS (Intermediate System to Intermediate System) is a link-state interior gateway routing protocol used to efficiently route IP traffic within large service provider and enterprise networks.
-
A.
IS-IS for IPv6
IS-IS for IPv6 is an extension of the IS-IS interior gateway routing protocol that enables dynamic routing and topology discovery in IPv6 networks.
-
B.
OSPF
OSPF (Open Shortest Path First) is a widely used interior gateway routing protocol that employs link-state information to determine the most efficient path for data within an IP network.
-
C.
OSPFv3
OSPFv3 is the version of the Open Shortest Path First routing protocol designed to operate over IPv6 networks, providing link-state routing and support for IPv6 addressing and features.
-
D.
EIGRP
EIGRP (Enhanced Interior Gateway Routing Protocol) is a Cisco-developed advanced distance-vector routing protocol used to efficiently route IP traffic within large enterprise networks.
-
E.
BGP
BGP (Border Gateway Protocol) is the primary inter-domain routing protocol used to exchange routing information and determine paths between autonomous systems on the global Internet.
- F. None of above. chosen
Statements (54)
| Predicate | Object |
|---|---|
| instanceOf |
interior gateway protocol
ⓘ
link-state routing protocol ⓘ routing protocol ⓘ |
| abbreviation |
IS‑IS
self-link
ⓘ
surface form:
IS-IS
|
| authenticationMethod |
HMAC-MD5
ⓘ
HMAC-SHA ⓘ clear-text password ⓘ |
| comparedWith | OSPF ⓘ |
| convergenceProperty | fast convergence ⓘ |
| definedInStandard | ISO 10589 ⓘ |
| designedFor | scalability in large networks ⓘ |
| doesNotUse |
Transmission Control Protocol
ⓘ
surface form:
TCP
UDP ⓘ |
| extension |
IS-IS for IP
ⓘ
Integrated IS-IS ⓘ IS‑IS self-linksurface differs ⓘ
surface form:
Multi-Topology IS-IS
|
| fullName |
IS‑IS
self-linksurface differs
ⓘ
surface form:
Intermediate System to Intermediate System
|
| hasHierarchyLevels |
Level 1
ⓘ
Level 1-2 ⓘ Level 2 ⓘ |
| messageType |
Complete Sequence Number PDU
ⓘ
Hello PDU ⓘ Link State PDU ⓘ Partial Sequence Number PDU ⓘ Sequence Number PDU ⓘ |
| neighborDiscoveryMethod | Hello packets ⓘ |
| originalDesignFor |
OSI protocol suite
ⓘ
surface form:
OSI networking
|
| routingAlgorithmType | link-state ⓘ |
| standardizedBy |
International Organization for Standardization
ⓘ
surface form:
ISO
|
| supports |
IPv4 routing
ⓘ
IPv6 routing ⓘ MPLS traffic engineering ⓘ equal-cost multipath routing ⓘ fast reroute mechanisms ⓘ hierarchical routing ⓘ multi-topology routing ⓘ route summarization ⓘ segment routing extensions ⓘ traffic engineering extensions ⓘ |
| supportsAuthentication | yes ⓘ |
| typeComparedAs | link-state IGP ⓘ |
| usedBy |
Internet service providers
ⓘ
large-scale data centers ⓘ |
| usedFor |
IP routing
ⓘ
intra-domain routing ⓘ routing within an autonomous system ⓘ |
| usedIn |
large enterprise networks
ⓘ
service provider networks ⓘ |
| usesAlgorithm |
OSPF
ⓘ
surface form:
Dijkstra shortest path first
|
| usesDatabase | link-state database ⓘ |
| usesMechanism | flooding of link-state information ⓘ |
| usesMetric | cost ⓘ |
| usesTransport |
CLNS
ⓘ
Layer 2 ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: IS‑IS Description of subject: IS-IS (Intermediate System to Intermediate System) is a link-state interior gateway routing protocol used to efficiently route IP traffic within large service provider and enterprise networks.
Referenced by (16)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
IS-IS
this entity surface form:
Designated Intermediate System
this entity surface form:
Use of OSI IS-IS for Routing in TCP/IP and Dual Environments
this entity surface form:
IS-IS
subject surface form:
IS-IS
this entity surface form:
Intermediate System to Intermediate System
subject surface form:
IS-IS
this entity surface form:
IS-IS
subject surface form:
IS-IS
this entity surface form:
Multi-Topology IS-IS
subject surface form:
Cisco NX-OS
this entity surface form:
IS-IS