Cisco Nexus 5000 Series Switch Fabric Manager Software Configuration Guide, NX-OS 4.0 (OL-16598-01, June 2008)

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11-15
Nexus 5000 Series Switch Fabric Manager Software Configuration Guide
OL-16598-01
Chapter 11 Configuring Domain Parameters
FC IDs
Enabling Contiguous Domain ID Assignments
To enable contiguous domains in a specific VSAN (or a range of VSANs) using Fabric Manager, perform
this task:
Step 1 Expand Fabricxx > VSANxx, and then choose Domain Manager in the Logical Domains pane for the
fabric and VSAN that you want to enable contiguous domains for.
You see the running configuration of the domain in the Information pane.
Step 2 Click the Configuration tab and check the Contiguous Allocation check box for each switch in the
fabric that will have contiguous allocation.
Step 3 Click the Apply Changes icon to save these changes.
FC IDs
When an N port logs into a 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 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.
• The volatile cache stores up to 4000 entries of WWN to FC ID binding. If this cache is full, a new
(more recent) entry overwrites the oldest entry in the cache. In this case, the corresponding WWN
to FC ID association for the oldest entry is lost.
• N ports receive the same FC IDs if disconnected and reconnected to any port within the same switch
(as long as it belongs to the same VSAN).
This section describes configuring FC IDs and includes the following topics:
• About Persistent FC IDs, page 11-16
• Enabling the Persistent FC ID Feature, page 11-16
• Persistent FC ID Configuration Guidelines, page 11-16
• Configuring Persistent FC IDs, page 11-17
• About Unique Area FC IDs for HBAs, page 11-17
• Configuring Unique Area FC IDs for an HBA, page 11-18
• About Persistent FC ID Selective Purging, page 11-19
• Purging Persistent FC IDs, page 11-19