5.25.1 TSN Egress Port Frame Preemption Status

Figure 5-87. TSN Egress Port Frame Preemption Status

The TSN Egress Port Frame Preemption Status page has the following parameters:

  • Port: The logical port for the settings contained in the same row.
  • Hold Advance: The value of the hold-Advance parameter for the Port in nanoseconds. There is no default value; the hold-Advance is a property of the underlying MAC.
  • Release Advance: The value of the release-Advance parameter for the Port in nanoseconds. There is no default value; the release-Advance is a property of the underlying MAC.
  • Preemption Active: The value is active (TRUE) when preemption is operationally active for the Port, and idle (FALSE) otherwise.
  • Hold Request: The value is hold (TRUE) when the sequence of gate operations for the Port has executed a Set-And-Hold-MAC operation, and release (FALSE) when the sequence of gate operations has executed a Set-And-Release-MAC operation. The value of this object is release (FALSE) on system initialization.
  • Status Verify: The status of the MAC Merge sublayer verification for the given device. The possible values are:
    • Initial – Verification process is initializing
    • idle – The verification process is ongoing
    • send – The verification process is ongoing
    • wait – The verification process is ongoing
    • succeeded – The verification process is completed and frame preemption is supported
    • failed – The verification process is completed and frame preemption is not supported
    • disabled – Frame preemption is disabled
    • indeterminate – The verification process is completed but it cannot be determined whether link partner supports frame preemption
  • Loc Preempt support: The value is TRUE when preemption is supported on the port, and FALSE otherwise.
  • Loc Preempt Enabled: The value is TRUE when preemption is enabled on the port, and FALSE otherwise.
  • Loc Preempt Active: The value is TRUE when preemption is operationally active on the port, and FALSE otherwise.
  • Loc Add Frag Size: The value of the 802.3br LocAddFragSize parameter for the port. The minimum size of non-final fragments supported by the receiver on the local port. This value is expressed in units of 64 octets of additional fragment length. The minimum non-final fragment size is: (LocAddFragSize + 1) * 64 octets.