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FC IDs
• 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).
Persistent FC IDs
When persistent FC IDs are enabled, the following occurs:
• The current FC IDs in use in the fcdomain are saved across reboots.
• The fcdomain automatically populates the database with dynamic entries that the switch has learned
about after a device (host or disk) is plugged into a port interface.
If you connect to the switch from an AIX or HP-UX host, be sure to enable the persistent FC ID feature
Note
in the VSAN that connects these hosts.
When persistent FC IDs are enabled, FC IDs cannot be changed after a reboot. FC IDs are enabled by
Note
default, but can be disabled for each VSAN.
A persistent FC ID assigned to an F port can be moved across interfaces and can continue to maintain the
same persistent FC ID.
Enabling the Persistent FC ID Feature
You can enable the persistent FC ID feature.
Procedure
Step 1
Step 2
Cisco Nexus 5500 Series NX-OS SAN Switching Configuration Guide, Release 7.x
44
Command or Action
configure terminal
Example:
switch# configure terminal
switch(config)#
fcdomain fcid persistent vsan vsan-id
Example:
switch(config)# fcdomain fcid persistent
vsan 78
Configuring Fibre Channel Domain Parameters
Purpose
Enters global configuration mode.
Activates (default) persistency of FC IDs
in the specified VSAN.
OL-30895-01
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