Deployment Guide

Duplicate PWWN behavior: Port type determines which login takes precedence TABLE 13
Input port First port login is NPIV port First port login is F_Port
FLOGI received New login forces an explicit logout of original FDISC on the
previous NPIV port.
If Base Device Logout is enabled on the NPIV port, only the base
device is logged out and the remaining NPIV devices stay logged
in.
New login is rejected and the
new port is persistently
disabled.
FDISC received New FDISC forces an explicit logout of original FDISC on the
previous NPIV port.
If Base Device Logout is enabled on the NPIV port, only the base
device is logged out and the remaining NPIV devices stay logged
in.
New FDISC is rejected.
Setting the behavior for handling duplicate PWWNs
You can configure how duplicate port WWNs (PWWNs) are handled if a device attempts to log in with
the same PWWN as another device on the switch.
1. Connect to the switch and log in using an account with admin permissions.
2. Enter the switchDisable command to disable the switch.
3. Enter the configure command.
4. Enter y after the F_Port login parameters prompt.
F-Port login parameters (yes, y, no, n): [no] y
5. Enter one of the following options at the Enforce FLOGI/FDISC login prompt to select the behavior
for handling duplicate PWWNs.
• Enter 0 to have the first login take precedence over the second login (default).
• Enter 1 to have the second login override the first login.
• Enter 2 to have the port type determine the behavior.
If a duplicate login is received on an F_Port, the duplicate login is rejected and the old login is
preserved; if a duplicate login is received on an NPIV port, the newer login is accepted.
Enforce FLOGI/FDISC login: (0..2) [0] 1
6. Respond to the remaining prompts, or press Ctrl + D to accept the other settings and exit.
7. Enter the switchEnable command to re-enable the switch.
With any of these settings, detection of duplicate PWWNs results in a RASLog. Ports that are
restricted become persistently disabled, marked with the reason "Duplicate Port WWN detected".
Forward error correction
Forward error correction (FEC) provides a data transmission error control method by including
redundant data (error-correcting code) to ensure error-free transmission on a specified port or port
range. When FEC is enabled, it can correct one burst of up to 11-bit errors in every 2112-bit
transmission, whether the error is in a frame or a primitive.
Setting the behavior for handling duplicate PWWNs
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