IEEE 802.1Q has introduced the combination of CBS and TAS (compare Figure 8-14 in 802.1Q-2018). This has lead in turn to a re-calculation of the (oper)IdleSlope for CBS in clause 126.96.36.199 of 802.1Q-2018 (see under d) there). In effect it means that a closed TAS-Gate will hold up a CBS stream for an ‘arbitrary’ amount of time. This is not currently accounted for in the math of section 6.5 in 802.1BA.
It further more results in “larger” bursts than was anticipated by the original CBS/.1BA considerations.
Worst case it may mean, that a (dynamic) reservation request for a CBS queue, which is behind a TAS-Gate, must lead to a change in the TAS control-list.
It furthermore means that the 75% recommendation of 34.3.1 in 802.1BA now only applies to the gate-open-time of the TAS-Gate. As one may want to compensate and simplify this configuration, it would be good if the math in section 6.5 of 802.1BA would differentiate between the actually used BW and the reserved BW.