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CFS Distribution Scopes
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m .
CFS Distribution Scopes
Different applications on the Cisco MDS 9000 Family switches need to distribute the configuration at
various levels:
•
•
•
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 like in the case of iSNS. Parallel uncoordinated
distributions are allowed for an application.
Coordinated Distribution
Coordinated distributions where an application can have only one such 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.
2.
3.
Coordinated distribution has two variants:
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•
Cisco MDS 9000 Family Configuration Guide
5-4
VSAN level
Applications that operate within the scope of a VSAN have the configuration distribution restricted
to the VSAN. An example application is port security where the configuration database is applicable
only within a VSAN.
Physical topology level
Applications might need to distribute the configuration to the entire physical topology spanning
several VSANs. Such applications include NTP and DPVM (WWN based VSAN), which are
independent of VSANs.
Between two switches
Applications might only operate between two switches in the fabric. An example application is SCSI
Flow Services.
A fabric lock is acquired.
The configuration is distributed and committed.
The fabric lock is released.
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.
Chapter 5
Using the CFS Infrastructure
OL-6973-03, Cisco MDS SAN-OS Release 2.x
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