Dell PowerConnect 7024 User Manual - Page 1117
How Are Traffic Queues Defined?, Which Queue Management Methods Are Supported?
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How Are Traffic Queues Defined? For each queue, you can specify: • Minimum bandwidth guarantee: A percentage of the port's maximum negotiated bandwidth reserved for the queue. • Scheduler type - strict/weighted: - Strict priority scheduling gives an absolute priority, with traffic in the highest priority queues always sent first, and traffic in the lowest priority queues always sent last. - Weighted scheduling requires a specification of priority for each queue relative to the other queues, based on their minimum bandwidth values. Which Queue Management Methods Are Supported? The switch supports the following methods, configurable per-interfacequeue, for determining which packets are dropped when the queue is full: • Taildrop: Any packet forwarded to a full queue is dropped regardless of its importance. • Weighted Random Early Detection (WRED) drops packets selectively based their drop precedence level. For each of four drop precedence levels on each WRED-enabled interface queue, you can configure the following parameters: - Minimum Threshold: A percentage of the total queue size below which no packets of the selected drop precedence level are dropped. - Maximum Threshold: A percentage of the total queue size above which all packets of the selected drop precedence level are dropped. - Drop Probability: When the queue depth is between the minimum and maximum thresholds, this value provides a scaling factor for increasing the number of packets of the selected drop precedence level that are dropped as the queue depth increases. Configuring Class-of-Service 1117
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1,211
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1,212
-
1,213
-
1,214
-
1,215
-
1,216
-
1,217
-
1,218
-
1,219
-
1,220
-
1,221
-
1,222
-
1,223
-
1,224
-
1,225
-
1,226
-
1,227
-
1,228
-
1,229
-
1,230
-
1,231
-
1,232
-
1,233
-
1,234