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<a name="wp1073385"> </a><h1 class="pTitle">
4-Port 10-Gbps Switching Module BB_Credit Buffers

</h1>
<a name="wp1073390"> </a><p class="pBody">
<a href="buffers16.html#wp1073394">Table&#160;14-9</a> lists the BB_credit buffer allocation for 4-port 10-Gbps switching modules.

</p>
<a name="wp1073460"> </a><p class="pBodyRelative">
</p><div>
<table border="2" cellpadding="2" id="wp1073394table1073391">
  <caption><a name="wp1073394"> </a><div class="pTableTitle">
Table&#160;14-9	4-Port 10-Gbps Switching Module BB_Credit Buffer Allocation

</div>
</caption>
  <tr bgcolor="#CCCCCC" align="left" valign="middle">    <th colspan="1" rowspan="3"><a name="wp1073400"> </a><p class="pCellHeading">
BB_Credit Buffer Allocation Type

</p>
</th>
    <th colspan="2" rowspan="1"><a name="wp1073402"> </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="wp1073408"> </a><p class="pCellHeading">
Dedicated Rate Mode

</p>
<a name="wp1073409"> </a><p class="pCellHeading">
10-Gbps Speed

</p>
</th>
</tr>
  <tr bgcolor="#CCCCCC" align="left" valign="middle">    <th><a name="wp1073418"> </a><p class="pCellHeading">
ISL<a href="#wp1073417"><sup class="Footnote">1</sup></a>

</p>
</th>
    <th><a name="wp1073423"> </a><p class="pCellHeading">
F port<a href="#wp1073422"><sup class="Footnote">2</sup></a>

</p>
</th>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1073425"> </a><p class="pBody">
Default BB_credit buffers

</p>
</td>
    <td><a name="wp1073427"> </a><p class="pBody">
250

</p>
</td>
    <td><a name="wp1073429"> </a><p class="pBody">
16

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1073431"> </a><p class="pBody">
Maximum BB_credit buffers

</p>
</td>
    <td><a name="wp1073433"> </a><p class="pBody">
750

</p>
</td>
    <td><a name="wp1073435"> </a><p class="pBody">
16

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1073437"> </a><p class="pBody">
Maximum BB_credit buffers on one of the ports with 
Enterprise license

</p>
</td>
    <td><a name="wp1073439"> </a><p class="pBody">
4095

</p>
</td>
    <td>&#160;</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1073443"> </a><p class="pBody">
Total number of BB_credit buffers per module

</p>
</td>
    <td colspan="2" rowspan="1"><a name="wp1073445"> </a><p class="pBody">
5488

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1073449"> </a><p class="pBody">
Default Performance buffers

</p>
</td>
    <td><a name="wp1073451"> </a><p class="pBody">
145

</p>
</td>
    <td><a name="wp1073453"> </a><p class="pBody">
12

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1073455"> </a><p class="pBody">
Total number of performance buffers per module

</p>
</td>
    <td colspan="2" rowspan="1"><a name="wp1073457"> </a><p class="pBody">
512 (shared)

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

<table>
  <tr>
    <td><a name="wp1073417"> </a><p class="pTableFootnote">
<a href="#wp1073418"><sup class="Footnote">1</sup></a>ISL = E port or TE port.

</p>
<a name="wp1073422"> </a><p class="pTableFootnote">
<a href="#wp1073423"><sup class="Footnote">2</sup></a>Ports on the 4-port 10-Gbps cannot operate in FL port mode.

</p>
</td>
  </tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<a name="wp1073461"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> The ports in the 4-port 10-Gbps switching module only support 10-Gbps dedicated rate mode. FL port 
mode and shared rate mode are not supported.

</p>
<a name="wp1073463"> </a><p class="pBody">
The following considerations apply to BB_credit buffers on 4-port 10-Gbps switching modules:

</p>
<div class="pSmartList1"><ul class="pSmartList1">
<a name="wp1073464"> </a><li class="pSmartList1">BB_credit buffers for ISL connections can be configured from a minimum of 2 buffers to a 
maximum of 750 buffers.
</li>
<a name="wp1073465"> </a><li class="pSmartList1">BB_credit buffers for Fx port mode connections can be configured from a minimum of 2 buffers to 
a maximum of 750 buffers.
</li>
<a name="wp1073466"> </a><li class="pSmartList1">By default, 512 performance buffers are preallocated and are shared by all the ports. These buffers 
are configurable and the buffers are assigned to the port based on the availability of the buffers in 
the shared pool. 
</li>
<a name="wp1073467"> </a><li class="pSmartList1">There are 2488 extra buffers available as extended BB_credits after allocating all the default 
BB_credit buffers for all the ports in ISL mode (5488 - (750 * 4)).
</li>
<a name="wp1073468"> </a><p class="pListNote1">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> Extended BB_credits are allocated across all ports on the switch. That is, they are not allocated 
by port group.

</p>
</ul></div>
<hr /><br><p class="pBody">Copyright 2010-2013, Cisco Systems, Inc. All rights reserved.</p> 

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