Requested revision
Standard: | IEEE 802.1CB | Clause: | 6.2 |
Clause title: | Stream identification function |
Rationale for revision
Clause 6.2, item a.2 states that frames that are not identified by a stream identification function shall get the "null value" assigned for the stream_handle. But "null value" is never defined. Different implementations could defined "null value" differently thus resulting in the impossibility to use this stream_handle for other mechanisms like PSFP.
Proposed text
Define "null value" as the numerical value 0. Append the following paragraph at the end of Sect. 6.2: "The null-value, i.e., the stream_handle assigned to packets that belong to no known stream, is 0." Append the following note at the end of Sect. 9.1.1.1 tsnStreamIdHandle: "NOTE - It is also possible to assign a packet that was identified as belonging to a known stream (i.e., a specific tsnStreamIdEntry) a stream handle equal 0, i.e., the null-value."
Impact on existing networks
Current implementations that define "null value" as something different
than the numerical value 0 would be non-conformant.
Originator
Name: | Marina Gutierrez | Email: | marina.gutierrez@tttech.com<mailto:marina.gutierrez@tttech.com> |
Affiliation: | TTTech Computertechnik AG | ||
Submitted: | 2021-04-12 |