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Chapter 5
Using the CFS Infrastructure
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 Features
CFS has the following features:
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CFS Protocol
The CFS functionality is independent of the lower layer transport. Currently, in Cisco MDS switches,
the CFS protocol layer resides on top of the FC2 layer. CFS uses the FC2 transport services to send
information to other switches. CFS uses a proprietary SW_ILS (0x77434653) protocol for all CFS
packets. CFS packets are sent to/from the switch domain controller addresses.
Applications that use CFS are completely unaware of the lower layer transport.
OL-6973-03, Cisco MDS SAN-OS Release 2.x
Three modes of distribution
Coordinated distributions
–
Only one distribution is allowed in the fabric at any given time.
Uncoordinated distributions
–
Multiple parallel distributions are allowed in the fabric except when a coordinated distribution
is in progress.
Unrestricted uncoordinated distributions
–
As of Cisco SAN-OS Release 2.1(1a), multiple parallel distributions are allowed 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.
Three scopes of distribution
Logical scope
–
The distribution occurs within the scope of a VSAN.
Physical scope
–
The distribution spans the entire physical topology.
Over a selected set of VSANs
–
As of Cisco SAN-OS Release 2.1(1a), some applications, such as Inter-VSAN Routing (IVR),
require configuration distribution over some specific VSANs. These applications can specify to
CFS the set of VSANs over which to restrict the distribution.
A peer-to-peer protocol that does not have a client-server relationship at the CFS layer.
Supports a merge protocol which facilitates the merge of application configuration during a fabric
merge event (when two independent fabrics merge).
Cisco MDS 9000 Family Configuration Guide
CFS Features
5-3
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