Rejecting Duplicate Pwwns - Cisco Nexus 5000 Series Configuration Manual

Managing FLOGI, Name Server, FDMI, and RSCN Databases

Rejecting Duplicate pWWNs

By FC standard, NX-OS will accept a login on any interface of a pwwn that is already logged in on the same
switch, same vsan, same fcdomain. To prevent the same pwwn from logging in the same switch on a different
interface, use the port security feature.
By default, any future flogi (with duplicate pwwn) on different switch in the same vsan, will be rejected and
earlier FLOGI retained, which does not follow FC standards.
If you disable this option, any future flogi (with duplicate pwwn) on different switch in the same VSAN,will
be allowed to succeed by deleting earlier FCNS entry.
Rejecting Duplicate pWWNs
By FC standard, NX-OS will accept a login on any interface of a pwwn that is already logged in on the same
switch, same vsan, same fcdomain. To prevent the same pwwn from logging in the same switch on a different
interface, use the port security feature.
By default, any future flogi (with duplicate pwwn) on different switch in the same vsan, will be rejected and
earlier FLOGI retained, which does not follow FC standards.
If you disable this option, any future flogi (with duplicate pwwn) on different switch in the same VSAN,will
be allowed to succeed by deleting earlier FCNS entry.
To reject duplicate pWWNs, follow these steps:
SUMMARY STEPS
1. configure terminal
2. fcns reject-duplicate-pwwn vsan vsan-id
3. no fcns reject-duplicate-pwwn vsan vsan-id
DETAILED STEPS
Command or Action
Step 1 configure terminal
Example:
switch# configure terminal
switch(config)#
Step 2 fcns reject-duplicate-pwwn vsan vsan-id
Example:
switch(config)# fcns reject-duplicate-pwwn vsan
100
Step 3 no fcns reject-duplicate-pwwn vsan vsan-id
Example:
switch(config)# no fcns reject-duplicate-pwwn
vsan 256
OL-27583-01
Purpose
Enters global configuration mode.
Any future flogi (with duplicate pwwn) on different switch,
will be rejected and earlier FLOGI retained (default).
Any future flogi (with duplicate pwwn) on different switch,
will be allowed to succeed by deleting earlier FCNS entry.
But you can still see the earlier entry in FLOGI database in
the other switch.
Cisco Nexus 5000 Series NX-OS SAN Switching Configuration Guide, Release 5.2(1)N1(1)
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