Internet Protocol type of service field
E519654
The Internet Protocol type of service field is a header field in IP packets originally intended to indicate desired quality-of-service parameters such as delay, throughput, and reliability for network routing and handling decisions.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Differentiated Services | 1 |
| Differentiated Services Code Point | 1 |
| Differentiated Services field | 1 |
| Internet Protocol type of service field canonical | 1 |
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
IP header field
ⓘ
network protocol field ⓘ |
| appliesTo | IP packets ⓘ |
| associatedWithConcept |
priority routing
ⓘ
quality of service ⓘ traffic engineering ⓘ |
| category | Internet standard mechanism ⓘ |
| definedIn | RFC 791 NERFINISHED ⓘ |
| hasAlternativeName |
TOS byte
ⓘ
ToS field ⓘ Type of Service field ⓘ |
| hasBitLength | 8 bits ⓘ |
| hasComponent |
cost bit
ⓘ
delay bit ⓘ precedence field ⓘ reliability bit ⓘ throughput bit ⓘ |
| hasScope | per-hop behavior indication ⓘ |
| historicalNote | many early networks ignored ToS semantics ⓘ |
| influences |
packet forwarding behavior
ⓘ
queuing decisions in routers ⓘ scheduling of packets ⓘ |
| introducedInProtocolVersion | IPv4 ⓘ |
| layer | network layer ⓘ |
| mappedTo |
Differentiated Services Code Point
NERFINISHED
ⓘ
Explicit Congestion Notification bits ⓘ |
| notPresentIn | original IPv6 header ⓘ |
| originalPurpose |
indicate cost preference
ⓘ
indicate delay preference ⓘ indicate desired quality of service ⓘ indicate reliability preference ⓘ indicate throughput preference ⓘ influence routing decisions ⓘ |
| OSIModelLayer | Layer 3 ⓘ |
| partOf | IPv4 header ⓘ |
| precedenceFieldBitLength | 3 bits ⓘ |
| protocolFamily | Internet Protocol NERFINISHED ⓘ |
| protocolVersion | IPv4 only ⓘ |
| QoSSubfieldBitLength | 4 bits ⓘ |
| redefinedBy |
RFC 2474
NERFINISHED
ⓘ
RFC 3168 NERFINISHED ⓘ |
| reservedBitLength | 1 bit ⓘ |
| status | largely deprecated in favor of DSCP ⓘ |
| supersededBy |
DS field
ⓘ
Differentiated Services field ⓘ |
| usedFor |
policy-based routing decisions
ⓘ
quality of service signaling ⓘ traffic prioritization ⓘ |
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Differentiated Services
this entity surface form:
Differentiated Services field