Cisco Nexus 5000 Series Switch CLI Software Configuration Guide, NX-OS 4.0(1a)N1 (OL-16597-01, January 2009)

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Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
OL-16597-01
Chapter 33 Configuring Domain Parameters
FC IDs
Displaying Session Status
You can display the status of the distribution session using the show fcdomain session-status vsan
command.
switch# show fcdomain session-status vsan 1
Last Action: Distribution Enable
Result: Success
About Contiguous Domain ID 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 situations
can occur:
• 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 switch 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.
Enabling Contiguous Domain ID Assignments
To enable contiguous domains in a specific VSAN (or a range of VSANs), perform this task:
FC IDs
When an N port logs into a Cisco Nexus 5000 Series switch, it is assigned an FC ID. By default, the
persistent FC ID feature is enabled. If this feature is disabled, the following situations can occur:
• An N port logs into a Cisco Nexus 5000 Series switch. The WWN of the requesting N port and the
assigned FC ID are retained and stored in a volatile cache. The contents of this volatile cache are
not saved across reboots.
• The switch is designed to preserve the binding FC ID to the WWN on a best-effort basis. For
example, if one N port disconnects from the switch and its FC ID is requested by another device,
this request is granted and the WWN with the initial FC ID association is released.
Command Purpose
Step 1
switch# configuration terminal
switch(config)#
Enters configuration mode.
Step 2
switch(config)# fcdomain contiguous-allocation
vsan vsan-id - vsan-id
Enables the contiguous allocation option in the
specified VSAN range.
Note The contiguous-allocation option
takes immediate effect at runtime. You
do not need to restart the fcdomain.
switch(config)# no fcdomain
contiguous-allocation vsan vsan-id
Disables the contiguous allocation option and
reverts it to the factory default in the specified
VSAN.