Fc Ids; Persistent Fc Ids; Enabling The Persistent Fc Id Feature - Cisco Nexus 5000 Series Configuration Manual
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Also See for Nexus 5000 Series:
- Cli configuration manual (660 pages) ,
- Configuration manual (324 pages) ,
- Command reference manual (196 pages)
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Configuring Fibre Channel Domain Parameters
FC IDs
When an N port logs into a SAN 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 SAN switch. The WWN of the requesting N port and the assigned FC ID are
• The switch is designed to preserve the binding FC ID to the WWN on a best-effort basis. For example,
• The volatile cache stores up to 4000 entries of WWN to FC ID binding. If this cache is full, a new (more
• N ports receive the same FC IDs if disconnected and reconnected to any port within the same switch (as
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
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.
SUMMARY STEPS
1. configure terminal
2. fcdomain fcid persistent vsan vsan-id
3. no fcdomain fcid persistent vsan vsan-id
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retained and stored in a volatile cache. The contents of this volatile cache are not saved across reboots.
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.
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.
long as it belongs to the same VSAN).
about after a device (host or disk) is plugged into a port interface.
Cisco Nexus 5000 Series NX-OS SAN Switching Configuration Guide, Release 5.2(1)N1(1)
FC IDs
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