Dynamic Link Exchange Protocol (DLEP) Latency Range Extension
Extracted elements (13)
The base DLEP Latency Data Item provides only a single, implementation-dependent latency value. This extension adds minimum and maximum latency fields to allow communicating the full range of latency observable on a link, enabling more informed routing decisions.
The usage of the Latency Range Extension does not impact processing associated with the Latency Data Item defined in RFC 8175. Both data items may coexist independently.
The Latency Range Data Item MAY be carried in any message where the Latency Data Item (RFC 8175) is allowed, and is carried as an additional data item.
The Latency Range Data Item MUST be included in the Session Initialization Response Message, with default values to be used on a session-wide basis.
The use of the Latency Range Extension SHOULD be configurable.
To indicate that the Latency Range Extension is to be used, an implementation MUST include the Latency Range Extension Type Value in the Extensions Supported Data Item.
When present, the Latency Range Data Item MUST be processed according to the same rules as the Latency Data Item defined in RFC 8175.
The Maximum Latency field is a 64-bit unsigned integer representing the longest transmission delay, in microseconds, that a packet encounters as it is transmitted over the link.
The Minimum Latency field is a 64-bit unsigned integer representing the shortest transmission delay, in microseconds, that a packet can encounter as it is transmitted over the link.
IANA has assigned Data Item Type Value 28 with description 'Latency Range' in the 'Data Item Type Values' registry within the 'Dynamic Link Exchange Protocol (DLEP) Parameters' registry, under the Specification Required policy.
IANA has assigned Extension Type Value 4 with description 'Latency Range' in the 'Extension Type Values' registry within the 'Dynamic Link Exchange Protocol (DLEP) Parameters' registry, under the Specification Required policy.
The Latency Range Extension introduces a new Data Item for DLEP but does not inherently introduce any additional vulnerabilities above those documented in RFC 8175. The security approach from RFC 8175 applies equally to this extension.
The Latency Range Data Item has Data Item Type 28, Length 16, and carries two 64-bit unsigned integer fields: Maximum Latency and Minimum Latency, each representing transmission delay in microseconds.