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FTOS Configuration Guide for the C-Series - Force10 Networks

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Tune Buffers on linecard<br />

Command Mode Function<br />

buffer-profile fp fsqueue Global Config Define a buffer profile <strong>for</strong> <strong>the</strong> FP queues.<br />

buffer-profile csf csqueue Global Config Define a buffer profile <strong>for</strong> <strong>the</strong> CSF queues<br />

(connection from CSF to FP across <strong>the</strong><br />

Internal Dateaplane Interface).<br />

buffer dedicated <br />

<br />

<br />

If you attempt to apply a buffer profile to a non-existent port-pipe, <strong>FTOS</strong> displays Message 31.<br />

Apply Your Changes<br />

Profile<br />

Config<br />

buffer dynamic Profile<br />

Config<br />

buffer fp-uplink linecard port-set<br />

buffer-policy fsqueue<br />

buffer csf linecard port-set <br />

buffer-policy csqueue<br />

Message 31 Buffer Allocation Error on S-<strong>Series</strong><br />

Global Config<br />

Global Config<br />

Change <strong>the</strong> dedicated buffers on a physical<br />

1-GE interface.<br />

Change <strong>the</strong> maximum amount of dynamic<br />

buffers an interface can request. Use <strong>the</strong><br />

<strong>for</strong>mula mentioned above <strong>for</strong> dynamic cell<br />

limit<br />

Apply <strong>the</strong> buffer profile defined earlier to a<br />

line card.<br />

Apply <strong>the</strong> buffer profile defined earlier to a<br />

CSF to FP connection.<br />

%DIFFSERV-2-DSA_DEVICE_BUFFER_UNAVAILABLE: Unable to allocate dedicated buffers.<br />

<strong>Configuration</strong> changes take effect immediately and will appear in <strong>the</strong> running configuration. Since under<br />

normal conditions all ports will not require <strong>the</strong> maximum possible allocation, <strong>the</strong> configured dynamic<br />

allocations <strong>for</strong> can be oversubscribed i.e. can exceed <strong>the</strong> actual amount of available memory. If you<br />

choose to oversubscribe <strong>the</strong> dynamic allocation, a burst of traffic on one interface may prevent o<strong>the</strong>r<br />

interfaces from getting <strong>the</strong> configured dynamic allocation, leading to packet drops.<br />

You cannot allocate more than <strong>the</strong> available memory <strong>for</strong> <strong>the</strong> dedicated buffers. If <strong>the</strong> system determines<br />

that <strong>the</strong> sum of <strong>the</strong> configured dedicated buffers allocated to <strong>the</strong> queues is more than <strong>the</strong> total available<br />

memory, <strong>the</strong> configuration is rejected with a syslog message similar to <strong>the</strong> following. (Note: There are no<br />

CLI errors.)<br />

Table 79 Buffer Allocation Error on C-<strong>Series</strong><br />

Mar 26 01:54:16: %E48VB:0 %DIFFSERV-2-DSA_DEVICE_BUFFER_UNAVAILABLE: Unable to allocate<br />

dedicated buffers <strong>for</strong> linecard 0, port pipe 0, egress port 24 due to unavailability of cells<br />

714 C-<strong>Series</strong> Debugging and Diagnostics

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