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Chapter 26
Configuring Domain Parameters
If you configure an allowed list on one switch in the fabric, we recommend you configure the same list
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in all other switches in the fabric to ensure consistency.
An allowed domain ID list must satisfy the following conditions:
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•
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Merging 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:
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•
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. However, if you enable the auto-reconfigure option
on both switches before connecting the fabric, a disruptive reconfiguration (RCF) occurs. A disruptive
reconfiguration may affect data traffic. You can nondiruptively reconfigure the fcdomain by changing
the configured domains on the overlapping links and getting rid of the domain overlap.
Assigning Contiguous Domains
By default, the contiguous-allocation option is disabled. When the subordinate switches request the
principal switch for two or more domains and the domains are not contiguous, the following cases apply:
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•
The contiguous-allocation option takes immediate effect at runtime; you do not need to restart the
fcdomain.
Disabling the fcdomain Feature
By default, the fcdomain feature is enabled on each switch. If you disable the fcdomain feature in a
switch, that switch can no longer participate with other switches in the fabric.
The fcdomain configuration is applied to runtime through a disruptive restart.
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If this switch is a principal switch, all the currently assigned domain IDs must be in the allowed list.
If this switch is a subordinate switch, the local runtime domain ID must be in the allowed list.
The locally-configured domain ID of the switch must be in the allowed list.
The intersection of the assigned domain IDs with other already-configured domain ID lists must not
be empty.
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-allocation option is enabled in the principal switch, the principal switch locates
contiguous domains and assigns them to the subordinate switches.
If the contiguous-allocation option is disabled in the principal switch, the principal switch assigns
the available domains to the subordinate switches.
Cisco MDS 9000 Fabric Manager Switch Configuration Guide
Merging Stable Fabrics
26-7
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