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FTOS Configuration Guide for the C-Series - Force10 Networks

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• Fast burst – Sufficient time likely will not be available <strong>for</strong> <strong>the</strong> buffer manager to create new buffers. In<br />

this case, you may choose to increase <strong>the</strong> dedicated buffer pool <strong>for</strong> a particular queue or interface or, if<br />

not feasible, increase <strong>the</strong> oversubscription of <strong>the</strong> dynamic buffer pool.<br />

Note: With fast bursts, <strong>the</strong> number of failures may continue to increase.<br />

Be<strong>for</strong>e tuning <strong>the</strong> buffer settings, make sure you have characterized <strong>the</strong> burst type on your network. If you<br />

are experiencing drops, do <strong>the</strong> drops happen only at certain times of <strong>the</strong> day? If so, what type of data<br />

transfers happen at those times? SNMP and <strong>the</strong> IF MIB can be used to create a baseline of interface<br />

utilization.<br />

As a guideline, consider tuning buffers if traffic is very bursty (and coming from several interfaces). If so:<br />

• Reduce <strong>the</strong> dedicated buffer on all queues/interfaces,<br />

• Increase <strong>the</strong> dedicated buffer on all interfaces<br />

<strong>Configuration</strong> Task List<br />

• Tune Buffers on a Front-End 1-GE Interface<br />

• Tune Buffers on a Front-End 10-GE Interface<br />

• Tune Buffers on a FP Uplink Port<br />

• Apply Your Changes<br />

<strong>FTOS</strong> <strong>Configuration</strong> <strong>Guide</strong>, version 7.7.1.0 713

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