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    <title>18-Port Fibre Channel/4-Port Gigabit Ethernet Multiservice Module BB_Credit Buffers </title>
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    <blockquote>
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<a name="wp1073215"> </a><h1 class="pTitle">
18-Port Fibre Channel/4-Port Gigabit Ethernet Multiservice Module BB_Credit Buffers

</h1>
<a name="wp1073219"> </a><p class="pBody">
<a href="buffers14.html#wp1073223">Table&#160;14-7</a> lists the BB_credit buffer allocation for 18-port 4-Gbps multiservice modules.

</p>
<a name="wp1073297"> </a><p class="pBodyRelative">
</p><div>
<table border="2" cellpadding="2" id="wp1073223table1073220">
  <caption><a name="wp1073223"> </a><div class="pTableTitle">
Table&#160;14-7	18-Port 4-Gbps Multiservice Module BB_Credit Buffer Allocation

</div>
</caption>
  <tr bgcolor="#CCCCCC" align="left" valign="middle">    <th colspan="1" rowspan="3"><a name="wp1073233"> </a><p class="pCellHeading">
BB_Credit Buffer Allocation

</p>
</th>
    <th colspan="4" rowspan="1"><a name="wp1073235"> </a><p class="pCellHeading">
BB_Credit Buffers Per Port

</p>
</th>
</tr>
  <tr bgcolor="#CCCCCC" align="left" valign="middle">    <th colspan="2" rowspan="1"><a name="wp1073245"> </a><p class="pCellHeading">
Dedicated Rate Mode

</p>
<a name="wp1073246"> </a><p class="pCellHeading">
4-Gbps Speed

</p>
</th>
    <th colspan="2" rowspan="1"><a name="wp1073250"> </a><p class="pCellHeading">
Shared Rate Mode

</p>
<a name="wp1073251"> </a><p class="pCellHeading">
4-Gbps Speed

</p>
</th>
</tr>
  <tr bgcolor="#CCCCCC" align="left" valign="middle">    <th><a name="wp1073260"> </a><p class="pCellHeading">
ISL<a href="#wp1073259"><sup class="Footnote">1</sup></a>

</p>
</th>
    <th><a name="wp1073262"> </a><p class="pCellHeading">
Fx Port

</p>
</th>
    <th><a name="wp1073264"> </a><p class="pCellHeading">
ISL<sup class="cSuperscriptBold">1
</sup>
</p>
</th>
    <th><a name="wp1073266"> </a><p class="pCellHeading">
Fx Port

</p>
</th>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1073268"> </a><p class="pBody">
Default BB_credit buffers

</p>
</td>
    <td><a name="wp1073270"> </a><p class="pBody">
250

</p>
</td>
    <td><a name="wp1073272"> </a><p class="pBody">
16

</p>
</td>
    <td><a name="wp1073274"> </a><p class="pBody">
16

</p>
</td>
    <td><a name="wp1073276"> </a><p class="pBody">
16

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1073278"> </a><p class="pBody">
Maximum BB_credit buffers

</p>
</td>
    <td><a name="wp1073280"> </a><p class="pBody">
250

</p>
</td>
    <td><a name="wp1073282"> </a><p class="pBody">
250

</p>
</td>
    <td><a name="wp1073284"> </a><p class="pBody">
16

</p>
</td>
    <td><a name="wp1073286"> </a><p class="pBody">
16

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1073288"> </a><p class="pBody">
Total number of BB_credit buffers per module

</p>
</td>
    <td colspan="4" rowspan="1"><a name="wp1073290"> </a><p class="pBody">
4509

</p>
</td>
</tr>
</table>

<table>
  <tr>
    <td><a name="wp1073259"> </a><p class="pTableFootnote">
<a href="#wp1073260"><sup class="Footnote">1</sup></a>ISL = E port or TE port.

</p>
</td>
  </tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<a name="wp1073299"> </a><p class="pBody">
The following considerations apply to BB_credit buffers on18-port 4-Gbps Fibre Channel switching 
modules:

</p>
<div class="pSmartList1"><ul class="pSmartList1">
<a name="wp1073300"> </a><li class="pSmartList1">BB_credit buffers for ISL connections can be configured from a minimum of 2 buffers to a 
maximum of 250 buffers for dedicated rate mode or 16 buffers for shared rate mode.
</li>
<a name="wp1073301"> </a><li class="pSmartList1">BB_credit buffers for Fx port mode connections can be configured. The minimum is 2 buffers and 
the maximum of 250 buffers for dedicated rate mode or 16 buffers for shared rate mode.
</li>
<a name="wp1073302"> </a><li class="pSmartList1">Performance buffers are not supported on this module.
</li>
</ul></div>
<hr /><br><p class="pBody">Copyright 2010-2013, Cisco Systems, Inc. All rights reserved.</p> 

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