Cfs Merge Support; Verifying Cfs Merge Status - Cisco AP776A - Nexus Converged Network Switch 5020 Configuration Manual

Chapter 7 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
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Exercise caution when using this function to clear locks in the fabric. Any pending configurations in any
Caution
switch in the fabric is flushed and lost.

CFS Merge Support

An application keeps the configuration synchronized in a 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 such notification,
a link-up event results in M*N merges in the fabric.
CFS supports a protocol that reduces the number of merges required to one by handling the complexity
of the merge at the CFS layer. This protocol runs per application per scope. The protocol involves
selecting one switch in a fabric as the merge manager for that fabric. The other switches do not play any
role in the merge process.
During a merge, the merge manager in the two fabrics exchange their configuration databases with each
other. The application on one of them merges the information, decides if the merge is successful, and
informs all switches in the combined fabric of the status of the merge.
In case of a successful merge, the merged database is distributed to all switches in the combined fabric
and the entire new fabric remains in a consistent state. You can recover from a merge failure by starting
a distribution from any of the switches in the new fabric. This distribution restores all peers in the fabric
to the same configuration database.

Verifying CFS Merge Status

The show cfs merge status name command displays the merge status for a given application. The
following example displays the output for an application distributing in logical scope. It shows the merge
status in all valid VSANs on the switch. The command output shows the merge status as one of the
following: Success, Waiting, Failure, or In Progress. In case of a successful merge, all the switches in
the fabric are shown under the local fabric. In case of a merge failure or a merge in progress, the local
fabric and the remote fabric involved in the merge are indicated separately. The application server in each
fabric that is mainly responsible for the merge is indicated by the term Merge Master.
switch# show cfs merge status name port-security
Logical [VSAN 1] Merge Status: Failed
Local Fabric
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Domain Switch WWN
OL-18084-01, Cisco MDS NX-OS Release 4.x
Switch# Conf t
Switch(conf)# dpvm abort
Clear the sessions from any switch in the fabric.
This example shows how to clear the CFS locks for the DPVM application:
Switch# Conf t
Switch# clear dpvm session
IP Address
Cisco MDS 9000 Family CLI Configuration Guide
CFS Merge Support
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