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    <title>RSCN Timer Configuration Distribution </title>
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<a name="wp1074397"> </a><h1 class="pTitle">
RSCN Timer Configuration Distribution

</h1>
<a name="wp1074398"> </a><p class="pBody">
Because the timeout value for each switch is configured manually, a misconfiguration occurs when 
different switches time out at different times. This means different Nports in a network can receive 
RSCNs at different times. Cisco Fabric Services (CFS) infrastructure alleviates this situation by 
automatically distributing the RSCN timer configuration information to all switches in a fabric. This 
action also reduces the number of SW-RSCNs. Refer to the <em class="cEmphasis">Cisco MDS 9000 Family NX-OS System 
Management Configuration Guide</em>.

</p>
<a name="wp1074399"> </a><p class="pBody">
RSCN supports two modes, distributed and nondistributed. In distributed mode, RSCN uses CFS to 
distribute configuration to all switches in the fabric. In nondistributed mode, only the configuration 
commands on the local switch are affected. 

</p>
<a name="wp1074400"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> All configuration commands are not distributed. Only the <b style="font-style: normal" class="cBold">rscn event-tov </b><span style="font-style: italic">tov</span><span style="font-style: normal"> vsan </span><span style="font-style: italic">vsan</span> command is 
distributed. 

</p>
<a name="wp1074401"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> Only the RSCN timer configuration is distributed. 

</p>
<a name="wp1074402"> </a><p class="pBody">
The RSCN timer is registered with CFS during initialization and switchover. For high availability, if the 
RSCN timer distribution crashes and restarts or a switchover occurs, it resumes normal functionality 
from the state prior to the crash or switchover. 

</p>
<a name="wp1074403"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> You can determine the compatibility when downgrading to an earlier Cisco MDS NX-OS release using 
<b class="cBold">show incompatibility system</b> command. You must disable RSCN timer distribution support before 
downgrading to an earlier release. 

</p>
<a name="wp1074404"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> By default, the RSCN timer distribution capability is disabled and is compatible when upgrading from 
any Cisco MDS SAN-OS release earlier than 3.0.

</p>
<a name="wp1074405"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> For CFS distribution to operate correctly for the RSCN timer configuration, all switches in the fabric 
must be running Cisco SAN-OS Release 3.0(1) or later, or Cisco NX-OS 4.1(1b).

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

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