Internet Assigned Numbers Authority

                                                Application-Layer Traffic Optimization (ALTO) Protocol

   Created
   2014-03-18

   Last Updated
   2023-08-14

   Available Formats
   [IMG]
   XML [IMG]
   HTML [IMG]
   Plain text

   Registries included below

     • ALTO Cost Modes
     • ALTO Cost Metrics
     • ALTO Cost Source Types
     • ALTO Endpoint Property Types
     • ALTO Address Types
     • ALTO Error Codes
     • ALTO Entity Domain Types
     • ALTO Entity Property Types

ALTO Cost Modes

   Registration Procedure(s)

 IETF Review

   Reference
   [RFC9274]

   Note

 Identifiers prefixed with "priv:" are reserved for Private Use (see
 [RFC9274], Section 5).


   Available Formats
   [IMG]
   CSV

   Identifier                                Description                                      Intended Semantics      Reference
   numerical  Indicates that numerical operations can be performed on the returned costs Section 6.1.2.1 of [RFC7285] [RFC9274]
   ordinal    Indicates that the cost values in a cost map represent ranking             Section 6.1.2.2 of [RFC7285] [RFC9274]
   array      Indicates that the cost value is a JSON array                              Section 6.5.2 of [RFC9275]   [RFC9275]

ALTO Cost Metrics

   Registration Procedure(s)

 IETF Review

   Reference
   [RFC7285][RFC Errata 6874]

   Note

 Identifiers prefixed with "priv:" are reserved for Private Use (see
 [RFC7285], Section 10.6).


   Available Formats
   [IMG]
   CSV

     Identifier           Intended Semantics        Reference
   routingcost     See Section 6.1.1.1 of [RFC7285] [RFC7285]
   delay-ow        See Section 4.1 of [RFC9439]     [RFC9439]
   delay-rt        See Section 4.2 of [RFC9439]     [RFC9439]
   delay-variation See Section 4.3 of [RFC9439]     [RFC9439]
   lossrate        See Section 4.4 of [RFC9439]     [RFC9439]
   hopcount        See Section 4.5 of [RFC9439]     [RFC9439]
   tput            See Section 5.1 of [RFC9439]     [RFC9439]
   bw-residual     See Section 5.2 of [RFC9439]     [RFC9439]
   bw-available    See Section 5.3 of [RFC9439]     [RFC9439]
   ane-path        See Section 6.5.1 of [RFC9275]   [RFC9275]

ALTO Cost Source Types

   Registration Procedure(s)

 IETF Review

   Reference
   [RFC9439]

   Available Formats
   [IMG]
   CSV

   Identifier                          Intended Semantics                          Reference
   nominal    Values in nominal cases (Section 3.1 of [RFC9439])                   [RFC9439]
   sla        Values reflecting service level agreement (Section 3.1 of [RFC9439]) [RFC9439]
   estimation Values by estimation (Section 3.1 of [RFC9439])                      [RFC9439]

ALTO Endpoint Property Types

   Registration Procedure(s)

 IETF Review

   Reference
   [RFC7285][RFC Errata 6876]

   Note

 Identifiers prefixed with "priv:" are reserved for Private Use (see
 [RFC7285], Section 10.8.2).


   Available Formats
   [IMG]
   CSV

   Identifier       Intended Semantics       Reference
   pid        See Section 7.1.1 of [RFC7285] [RFC7285]

ALTO Address Types

   Registration Procedure(s)

 IETF Review

   Reference
   [RFC7285]

   Available Formats
   [IMG]
   CSV

   Identifier        Address Encoding                 Prefix Encoding         Mapping to/from IPv4/v6 Reference
   ipv4       See Section 10.4.3 of [RFC7285] See Section 10.4.3 of [RFC7285] Direct mapping to IPv4  [RFC7285]
   ipv6       See Section 10.4.3 of [RFC7285] See Section 10.4.3 of [RFC7285] Direct mapping to IPv6  [RFC7285]

ALTO Error Codes

   Registration Procedure(s)

 IETF Review

   Reference
   [RFC7285]

   Available Formats
   [IMG]
   CSV

        Error Code                                        Intended Usage                                  Reference
   E_SYNTAX              Parsing error in request (including identifiers). See Section 8.5.2 of [RFC7285] [RFC7285]
   E_MISSING_FIELD       A required JSON field is missing. See Section 8.5.2 of [RFC7285]                 [RFC7285]
   E_INVALID_FIELD_TYPE  The type of the value of a JSON field is invalid. See Section 8.5.2 of [RFC7285] [RFC7285]
   E_INVALID_FIELD_VALUE The value of a JSON field is invalid. See Section 8.5.2 of [RFC7285]             [RFC7285]

ALTO Entity Domain Types

   Registration Procedure(s)

 IETF Review

   Reference
   [RFC9240]

   Available Formats
   [IMG]
   CSV

     Identifier      Entity Identifier Encoding    Hierarchy and Inheritance   Media Type of Defining Resource   Mapping to ALTO Address  Reference
                                                                                                                          Type
   ipv4            See [RFC9240], Section 6.1.1   See [RFC9240], Section 6.1.3 application/alto-networkmap+json true                      [RFC9240]
   ipv6            See [RFC9240], Section 6.1.2   See [RFC9240], Section 6.1.3 application/alto-networkmap+json true                      [RFC9240]
   pid             See [RFC9240], Section 6.2     None                         application/alto-networkmap+json false                     [RFC9240]
   asn             See [RFC9241], Section 6.1.1.2 None                         None                             false                     [RFC9241]
   countrycode     See [RFC9241], Section 6.1.2.2 None                         None                             false                     [RFC9241]
   ane             See [RFC9275], Section 6.2.2   None                         application/alto-propmap+json    false                     [RFC9275]
   subdivisioncode See [RFC9388], Section 3.1.2   None                         None                             false                     [RFC9388]

ALTO Entity Property Types

   Registration Procedure(s)

 IETF Review

   Reference
   [RFC9240]

   Available Formats
   [IMG]
   CSV

          Identifier             Intended Semantics      Media Type of Defining Resource  Reference
   pid                      See [RFC7285], Section 7.1.1 application/alto-networkmap+json [RFC9240]
   cdni-capabilities        See [RFC9241], Section 6.2   application/alto-cdni+json       [RFC9241]
   max-reservable-bandwidth See [RFC9275], Section 6.4.1 application/alto-propmap+json    [RFC9275]
   persistent-entity-id     See [RFC9275], Section 6.4.2 application/alto-propmap+json    [RFC9275]

   Licensing Terms