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Chapter 14
Configuring Domain Parameters
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m .
Command
Step 3
switch(config-if)# fcdomain rcf-reject vsan 1
switch(config-if)# no fcdomain rcf-reject vsan 1
Persistent FC IDs
When an N or NL port logs into a Cisco MDS 9000 Family switch, it is assigned a FC ID. By default,
the persistent FC ID feature is enabled. If this feature is disabled, the following consequences apply:
•
•
•
•
If this feature remains enabled, the following consequences apply:
•
•
Note
Persistent FC IDs are enabled by default. This change of default behavior from releases prior to Cisco
Note
MDS SAN-OS Release 2.0(1b) prevents FC IDs from being changed after a reboot. You can disable this
option 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.
Persistent FC IDs with loop-attached devices (FL ports) need to remain connected to the same port in
Note
which they were configured.
OL-6973-03, Cisco MDS SAN-OS Release 2.x
An N or NL port logs into a Cisco MDS 9000 Family switch. The WWN of the requesting N or NL
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.
The switch connection behavior differs between N ports and NL ports:
–
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).
–
NL ports receive the same FC IDs only if connected back to the same port on the switch to which
they were originally connected.
The currently in use FC IDs 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 in the VSAN that connects these hosts.
Purpose
Enables the RCF filter on the specified
interface in VSAN 1.
Disables (default) the RCF filter on the
specified interface in VSAN 1.
Cisco MDS 9000 Family Configuration Guide
Persistent FC IDs
14-9
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