77 lines
5.7 KiB
HTML
77 lines
5.7 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Token bucket and bandwidth limits" />
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<meta name="abstract" content="Token bucket limits and bandwidth limits are together known as performance limits. These performance limits help guarantee packet delivery in outbound bandwidth policies, both integrated and differentiated service." />
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<meta name="description" content="Token bucket limits and bandwidth limits are together known as performance limits. These performance limits help guarantee packet delivery in outbound bandwidth policies, both integrated and differentiated service." />
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<meta name="DC.Relation" scheme="URI" content="rzak8intserv.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzak8diffserv.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzak8monitor_policy.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<title>Token bucket and bandwidth limits</title>
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</head>
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<body id="rzak8outboundlimits"><a name="rzak8outboundlimits"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Token bucket and bandwidth limits</h1>
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<div><p>Token bucket limits and bandwidth limits are together known as
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performance limits. These performance limits help guarantee packet delivery
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in outbound bandwidth policies, both integrated and differentiated service.</p>
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<div class="section"><h4 class="sectiontitle">Token bucket size</h4><p>The token bucket size determines
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the amount of information your server can process at any given time. If an
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application is sending your server information faster than the server can
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send the data out of the network, the buffer fills up. Any data packets exceeding
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this limit are treated as out-of-profile. Integrated service policies are
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the exception to this rule. You can select <samp class="codeph">do not limit</samp>,
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which will allow a ReSerVation Protocol (RSVP) connection request. For all
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other policies, you can determine how to handle out-of-profile traffic. The
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maximum token bucket size is 1 GB.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Token rate limit</h4><p>The rate limit specifies the long
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term data rate or the number of bits per second allowed into a network. The
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quality of service (QoS0 policy looks at the requested bandwidth
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and compares it with the rate and flow limits for this policy. If the request
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causes the server to exceed its limits, the server denies the request. The
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token rate limit is only used for admission control within integrated service
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policies. This value can vary between 10 Kbps to 1 Gbps. You can also set
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this to <samp class="codeph">do not limit</samp>. When you assign <samp class="codeph">do not limit</samp> to
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the rate, you are making the available resources the limit.</p>
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<div class="tip"><span class="tiptitle">Tip:</span> To
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determine what limits to set, you might want to run the monitor. Create a
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policy with an aggregate token rate limit large enough to collect most data
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traffic on your network. Then start data collection on this policy. The scenario
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about monitoring current network statistics shows one way to collect the total
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rates your application and network currently use. Using these results, you
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can reduce the limits appropriately.</div>
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<p>To view real-time monitor data
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instead of a particular data collection, just open the monitor. The monitor
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gives real-time statistics on all active policies.</p>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzak8intserv.htm" title="The second type of outbound bandwidth policy you can create is an integrated service policy. Integrated service provides the capability for IP applications to request and reserve bandwidth using the ReSerVation Protocol (RSVP) and quality of service (QoS) APIs.">Integrated service</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzak8diffserv.htm" title="This is the first type of outbound bandwidth policy you can create on your server. Differentiated service divides your traffic into classes. To carry out a differentiated service policy, you need to determine how you want to classify your network traffic and how to handle the different classes.">Differentiated service</a></div>
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<div><a href="rzak8monitor_policy.htm" title="Within the wizards, you are asked to set performance limits. These values cannot be recommended because they are based on individual network requirements.">Scenario: Monitor current network statistics</a></div>
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</div>
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</div>
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</body>
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</html>
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