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Chapter 14
Configuring Domain Parameters
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 .
Merged Stable Fabrics
By default, the auto-reconfigure option is disabled. When you join two switches belonging to two
different stable fabrics that have overlapping domains, the following cases apply:
•
•
The auto-reconfigure option takes immediate effect at runtime. You do not need to restart the fcdomain.
If a domain is currently isolated due to domain overlap, and you later enable the auto-reconfigure option
on both switches, the fabric continues to be isolated—if you enabled the auto-reconfigure option on both
switches before connecting the fabric, a disruptive reconfiguration (RCF) will occur. A disruptive
reconfiguration may affect data traffic. You can nondisruptively reconfigure the fcdomain by changing
the configured domains on the overlapping links and getting rid of the domain overlap.
To enable automatic reconfiguration in a specific VSAN (or range of VSANs), follow these steps:
Command
Step 1
switch# config t
switch(config)#
Step 2
switch(config)# fcdomain auto-reconfigure vsan 10
switch(config)# no fcdomain auto-reconfigure 69
Contiguous Domain Assignments
By default, the contiguous domain assignment is disabled. When a subordinate switch requests the
principal switch for two or more domains and the domains are not contiguous, the following cases apply:
•
•
To enable contiguous domains in a specific VSAN (or a range of VSANs), follow these steps:
Command
Step 1
switch# config t
switch(config)#
Step 2
switch(config)# fcdomain contiguous-allocation
vsan 81-83
switch(config)# no fcdomain
contiguous-allocation vsan 1030
OL-6973-03, Cisco MDS SAN-OS Release 2.x
If the auto-reconfigure option is enabled on both switches, a disruptive reconfiguration phase is
started.
If the auto-reconfigure option is disabled on either or both switches, the links between the two
switches become isolated.
If the contiguous domain assignment is enabled in the principal switch, the principal switch locates
contiguous domains and assigns them to the subordinate switches. If contiguous domains are not
available, the SAN-OS software rejects this request.
If the contiguous domain assignment is disabled in the principal switch, the principal switch assigns
the available domains to the subordinate switch.
Purpose
Enters configuration mode.
Enables the automatic reconfiguration
option in VSAN 10.
Disables the automatic reconfiguration
option and reverts it to the factory default in
VSAN 69.
Purpose
Enters configuration mode.
Enables the contiguous allocation option in
VSAN 81 through 83.
Note
The contiguous-allocation option
takes immediate effect at runtime. You
do not need to restart the fcdomain.
Disables the contiguous allocation option and
reverts it to the factory default in VSAN 1030.
Cisco MDS 9000 Family Configuration Guide
Merged Stable Fabrics
14-7
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