Lantronix
SM12XPA Web User Guide
33848 Rev. A
Page
319
of
473
TSN Troubleshooting
Note that TSN (time-sensitive networking) is not a single technology. TSN is a set of standards, maintained by
the IEEE 802.1 task group, defining mechanisms for time-sensitive transmission of data.
TSN provides these 3 main functions: synchronizing all clocks on the network, scheduling the highest priority
traffic, and then “shaping” remaining traffic to set the desired traffic patterns.
Time synchronization
: All devices that are participating in real-time communication need to have a
common understanding of time.
Scheduling and traffic shaping
: All devices that are participating in real-time communication adhere to
the same rules in processing and forwarding communication packets.
Selection of communication paths, path reservations, and fault-tolerance
: All devices that are
participating in real-time communication adhere to the same rules in selecting communication paths
and in reserving bandwidth and time slots, possibly utilizing more than one simultaneous path to
achieve fault-tolerance.
The set of Time-Sensitive Networking standards includes IEEE 802.1Qat Stream Reservation Protocol (SRP),
802.1aq Shortest Path Bridging (SPB), 802.1Qcc-2018 Stream Reservation Protocol (SRP) Enhancements and
Performance Improvements, 802.1Qci Per-Stream Filtering and Policing, 802.1CB-2017 FRER (Frame Replication
and Elimination for Reliability), etc.
Since TSN is an evolving set of standards, it is recommended that you:
1. Review in detail the available status and statistics webpages for obvious problems:
Stream Filter Status
on
page
306
,
Stream Filter Statistics
on page
307
,
Stream Gate Status
on page
308
, and
FRER Statistics
on page
311
.
2. Verify that the various TSN parameter settings are valid and consistent with your configuration. See these
webpages:
PTP Check
on page
289
,
Frame Preemption Configuration
on page
290
,
TAS Configuration Parameters
on page
291
,
Max SDU Size
on page
293
,
PSFP
on page
294
,
Flow Meter
on page
296
,
Stream Filter
on page
297
,
Stream Gate
on page
298
,
FRER
on page
300
,
TAS
on page
303
, and
PSFP
on page
305
.
