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13-4
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 13 Using the CFS Infrastructure
Disabling CFS Distribution on a Switch
CFS Distribution Modes
CFS supports different distribution modes to support different application requirements: coordinated and
uncoordinated distributions. Both modes are mutually exclusive. Only one mode is allowed at any given
time.
Uncoordinated Distribution
Uncoordinated distributions are used to distribute information that is not expected to conflict with that
from a peer. An example is local device registrations such as iSNS. Parallel uncoordinated distributions
are allowed for an application.
Coordinated Distribution
Coordinated distributions can have only one application distribution at a given time. CFS uses locks to
enforce this. A coordinated distribution is not allowed to start if locks are taken for the application
anywhere in the fabric. A coordinated distribution consists of three stages:
1. A fabric lock is acquired.
2. The configuration is distributed and committed.
3. The fabric lock is released.
Coordinated distribution has two variants:
• CFS driven —The stages are executed by CFS in response to an application request without
intervention from the application.
• Application driven—The stages are under the complete control of the application.
Coordinated distributions are used to distribute information that can be manipulated and distributed
from multiple switches, for example, the port security configuration.
Unrestricted Uncoordinated Distributions
Unrestricted uncoordinated distributions allow multiple parallel distributions in the fabric in the
presence of an existing coordinated distribution. Unrestricted uncoordinated distributions are allowed to
run in parallel with all other types of distributions.
Disabling CFS Distribution on a Switch
By default, CFS distribution is enabled. Applications can distribute data and configuration information
to all CFS-capable switches in the fabric where the applications exist. This is the normal mode of
operation.
You can globally disable CFS on a switch, to isolate the applications using CFS from fabric-wide
distributions while maintaining physical connectivity. When CFS is globally disabled on a switch, CFS
operations are restricted to the switch and all CFS commands continue to function as if the switch were
physically isolated.
To globally disable or enable CFS distribution on a switch using Fabric Manager, follow these steps:
Step 1 In the Physical Attributes pane, expand Switches > CFS.
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