Cfs Distribution Over Fibre Channel; Cfs Distribution Scopes; Cfs Merge Support - Cisco AP775A - Nexus Converged Network Switch 5010 Configuration Manual

Using Cisco Fabric Services
The following figure (Network Example 3) is the same as the previous figure except that node D and node E
are connected using IP. Both node C and node D forward the event to E because the node E is not in the
distribution list from node B.
Figure 38: Network Example 3 with Fibre Channel and IP Connections

CFS Distribution over Fibre Channel

For FCS distribution over Fibre Channel, 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 or from the switch domain controller addresses.

CFS Distribution Scopes

Different applications on the Cisco Nexus 5000 Series switches need to distribute the configuration at various
levels. The following levels are available when using CFS distribution over Fibre Channel:
• VSAN level (logical scope)
• Physical topology level (physical scope)
• Between two selected switches

CFS Merge Support

CFS Merge is supported for CFS distribution over Fibre Channel.
An application keeps the configuration synchronized in a SAN fabric through CFS. Two such fabrics might
merge as a result of an ISL coming up between them. These two fabrics could have two different sets of
configuration information that need to be reconciled in the event of a merge. CFS provides notification each
time an application peer comes online. If a fabric with M application peers merges with another fabric with
N application peers, and if an application triggers a merge action on every notification, a link-up event results
in M×N merges in the fabric.
OL-16597-01
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.
Logical scope is not supported for FCS distribution over IP.
Note
Some applications (such as NTP) need to distribute the configuration to the entire physical topology.
Some applications operate only between selected switches in the network.
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
CFS Distribution over Fibre Channel
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