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    <title>RSCN Timer Configuration Distribution Using CFS </title>
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<a name="wp1074135"> </a><h1 class="pTitle">
RSCN Timer Configuration Distribution Using CFS

</h1>
<a name="wp1074136"> </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 N ports in a network can receive 
RSCNs at different times. Cisco Fabric Services (CFS) alleviates this situation by automatically 
distributing configuration information to all switches in a fabric. This also reduces the number of 
SW-RSCNs. 

</p>
<a name="wp1074137"> </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="wp1074138"> </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="wp1074139"> </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="wp1074140"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> Before performing a downgrade, make sure that you revert the RCSN timer value in your network to the 
default value. Failure to do so will disable the links across your VSANs and other devices.

</p>
<a name="wp1074141"> </a><p class="pBody">
Compatibility across various Cisco MDS NX-OS releases during an upgrade or downgrade is supported 
by <b class="cBold">conf-check</b> provided by CFS. If you attempt to downgrade from Cisco MDS SAN-OS Release 3.0, 
you are prompted with a <b class="cBold">conf-check</b> warning. You are required to disable RSCN timer distribution 
support before you downgrade. 

</p>
<a name="wp1074142"> </a><p class="pBody">
By default, the RSCN timer distribution capability is disabled and is therefore compatible when 
upgrading from any Cisco MDS SAN-OS release earlier than Release 3.0.

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

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