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<a name="wp1076324"> </a><h1 class="pTitle">
Zone Enforcement

</h1>
<a name="wp1076327"> </a><p class="pBody">
Zoning can be enforced in two ways: soft and hard. Each end device (N port or NL port) discovers other 
devices in the fabric by querying the name server. When a device logs in to the name server, the name 
server returns the list of other devices that can be accessed by the querying device. If an Nx port does 
not know about the FC IDs of other devices outside its zone, it cannot access those devices.

</p>
<a name="wp1076330"> </a><p class="pBody">
In soft zoning, zoning restrictions are applied only during interaction between the name server and the 
end device. If an end device somehow knows the FC ID of a device outside its zone, it can access that 
device. 

</p>
<a name="wp1076333"> </a><p class="pBody">
Hard zoning is enforced by the hardware on each frame sent by an Nx port. As frames enter the switch, 
source-destination IDs are compared with permitted combinations to allow the frame at wirespeed. Hard 
zoning is applied to all forms of zoning.

</p>
<a name="wp1076334"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> Hard zoning enforces zoning restrictions on every frame, and prevents unauthorized access.

</p>
<a name="wp1076335"> </a><p class="pBody">
Switches in the Cisco MDS 9000 Family support both hard and soft zoning.

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

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