HP 6120XG ProCurve Series 6120 Blade Switches Management and Configuration Gui - Page 334
bandwidth-min, show bandwidth output <, show config, show running, Port Traffic Controls
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Port Traffic Controls Guaranteed Minimum Bandwidth (GMB) Notes: Configuring 0% for a queue can result in that queue being starved if any higher queue becomes over subscribed and is then given all unused bandwidth. A queue configured with 0% will be serviced as "strict". This means that packets on this queue will be sent until the queue is empty, before servicing the next lowerpriority queue, regardless of that lower priority queue's bandwidth-min setting. If packets are sent to a queue configured at 0%. lower priority queues can be starved and not reach their guaranteed minimum bandwidth setting. The switch applies the bandwidth calculation to the link speed the port is currently using. For example, if a 10/100 Mbs port negotiates to 10 Mbps on the link, then it bases its GMB calculations on 10 Mbps; not 100 Mbps. Use show bandwidth output < port-list > to display the current GMB configuration. (The show config and show running commands do not include GMB configuration data.) For example, suppose you wanted to configure the following outbound mini mum bandwidth availability for ports A1 and A2: Priority of Minimum Effect on Outbound Bandwidth Allocation Outbound Bandwidth Port Queue % 8 20 Queue 8 has the first priority use of all outbound bandwidth not specifically allocated to queues 1 - 7. If, for example, bandwidth allocated to queue 5 is not being used and queues 7 and 8 become oversubscribed, queue 8 has first-priority use of the unused bandwidth allocated to queue 5. 7 15 Queue 7 has a guaranteed minimum bandwidth of15% available for outbound traffic. If queue 7 becomes oversubscribed and queue 8 is not already using all of the unallocated bandwidth, then queue 7 can use the unallocated bandwidth. Also, any unused bandwidth allocated to queues 6 to queue 1 is available to queue 7 if queue 8 has not already claimed it. 6 10 Queue 6 has a guaranteed minimum bandwidth of 10% and, if oversubscribed, is subordinate to queues 8 and 7 in priority for any unused outbound bandwidth available on the port. 5 10 Queue 5 has a guaranteed minimum bandwidth of 10% and, if oversubscribed, is subordinate to queues 8, 7, and 6 for any unused outbound bandwidth available on the port. 4 10% Queue 4 has a guaranteed minimum bandwidth of 10% and, if oversubscribed, is subordinate to queues, 8, 7, 6, and 5 for any unused outbound bandwidth available on the port. 3 30% Queue 3 has a guaranteed minimum bandwidth of 30% and, if oversubscribed, is subordinate to queues, 8, 7, 6, 5, and 4 for any unused outbound bandwidth available on the port. 12-16