Brocade 6910 Ethernet Access Switch Configuration Guide (Supporting R2.2.0.0) - Manual (Page 873)

Brocade 6910 Ethernet Access Switch Configuration Guide 817
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Layer 2 Queue Settings
• A weight can be assigned to each of the weighted queues (and thereby to the corresponding
traffic priorities). This weight sets the frequency at which each queue is polled for service, and
subsequently affects the response time for software applications assigned a specific priority
value.
Service time is shared at the egress ports by defining scheduling weights for WRR, or one of
the queuing modes that use a combination of strict and weighted queuing.
• The specified queue mode applies to all interfaces.
• Protocols used to synchronize distributed switches use packets of 1588 bytes to control the
synchronization process. This switch therefore assigns packets of this size to the highest
priority queue to ensure quick passage.
Parameters
These parameters are displayed:
• Queue Mode
• Strict – Services the egress queues in sequential order, transmitting all traffic in the higher
priority queues before servicing lower priority queues. This ensures that the highest priority
packets are always serviced first, ahead of all other traffic.
• WRR – Weighted Round-Robin shares bandwidth at the egress ports by using scheduling
weights, and servicing each queue in a round-robin fashion. (This is the default setting.)
• Strict and WRR – Uses strict priority on the high-priority queues and WRR on the remaining
queues.
NOTE
When using Strict and WRR mode, assign strict mode on to higher priority queues; that is,
the higher numbered queues by default settings. Otherwise, the switch will not be able to
process the queues in a reliable manner due to chip set limitations.
• Queue ID – The ID of the priority queue. (Range: 0-7)
• Strict Mode – If “Strict and WRR” mode is selected, then a combination of strict service is used
for the high priority queues and weighted service for the remaining queues. Use this parameter
to specify the queues assigned to use strict priority. (Default: Disabled)
• Weight – Sets a weight for each queue which is used by the WRR scheduler. (Range: 1-255;
Default: Weights 1, 2, 4, 6, 8, 10, 12 and 14 are assigned to queues 0 - 7 respectively)
Interface
To configure the queue mode:
1. Click Traffic, Priority, Queue.
2. Set the queue mode.
3. If the weighted queue mode is selected, the queue weight can be modified if required.
4. If the queue mode that uses a combination of strict and weighted queueing is selected, the
queues which are serviced first must be specified by enabling strict mode parameter in the
table.
5. Click Apply.