834 Configuring Data Center Bridging Features
(or the queues are empty), TCGs that have not met their maximum
bandwidth limit are scheduled. Once the limits for a TCG are satisfied
(maximum bandwidth, no frames available for transmission, etc.), the
scheduler moves to the next TCG.
If no minimum or maximum bandwidth limits are configured, TCGs are
serviced by the second-level scheduler using the configured TCG weights to
define the relative bandwidth allocation among the TCGs. When an egress
port is congested, packets are selected for discard using the configured tail-
drop or WRED discipline. Minimum TCG bandwidth, maximum TCG
bandwidth, and TCG weights are metered to within approximately 3% of the
link bandwidth.
In the case that all TCGs are configured as strict priority, inter-TCG
scheduling reverts to Weighted Deficit Round Robin scheduling based on the
configured TCG weights.
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