Digital Equipment DLE49-MA, Руководство пользователя

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Transmit Queues Configuration Screen
DLE49-MA User’s Guide 6-67
Individual ports or all ports may be set to the STRICT 802.1p or
WEIGHTED mode of operation. In the STRICT 802.1p mode, frames are
transmitted strictly according to the priorities set in the Advanced Priority
Configuration screen. In this mode all frames with a transmit queue of Q3
are transmitted first, followed by those with transmit queues of Q2, then
Q1, and finally Q0.
In the WEIGHTED mode, a percentage (weighted value) is user assigned
to establish the amount of transmission capacity assigned to frames
associated with each priority transmit queue (Q0 through Q3 with Q0
being the lowest priority transmit queue). This allows the modification of
the strict priority queues so that frames with the lower priority queues are
guaranteed some access time to the transmitter.
For example, the transmit queues could be set as follows:
• Q3 to 50%, so at least 50% of the Q3 frames are transmitted.
• Q2 to 25%, so at least 25% of the Q2 frames are transmitted.
• Q1 to 25%, so at least 25% of the Q1 frames are transmitted.
• Q0 to 0%, no Q0 frames will be transmitted until Q3, Q2, and Q1
frames are transmitted.
To access the Transmit Queues Configuration screen from the 802.1p
Priority Configuration Menu screen, use the arrow keys to highlight the
TRANSMIT QUEUES CONFIGURATION menu item and press
ENTER. The Transmit Queues Configuration screen displays.