Skip to main content
NetApp Knowledge Base

What causes a port to be No_Sync in Fabric OS?

Views:
6,457
Visibility:
Public
Votes:
6
Category:
fabric-interconnect-and-management-switches
Specialty:
SAN
Last Updated:

Applies to

  • Brocade FC Switch
  • Fabric OS (FOS)

Answer

  • FC port cannot complete the synchronization phase when establishing a link with the remote device and is in state No_Sync
  • Port showing No_Sync indicates that the port is receiving the light but frames received are 'out of sync'.
  • Faulty cable or remote SFP can be narrowed down further with porterrshow delta or after statsclear  after port was enabled:
  • Port down and enabled in No_Sync

Example:

switchshow:
Index Port Address  Media Speed   State       Proto
==================================================
   5   5   080500   id    16G     No_Sync     FC

portshow 5
portDisableReason: None
portCFlags: 0x1
portFlags: 0x4041        PRESENT U_PORT LED
LocalSwcFlags: 0x0
portType:  27.0
POD Port: Port is licensed
portState: 2    Offline
Protocol: FC
portPhys:  5    No_Sync        portScn:   2    Offline

sfpshow:
RX Power:    -7.0    dBm (199.8uW
TX Power:    -40.0   dBm (0.1   uW)

Note: As the port is offline, the SFP's laser is turned off (TX -40)

  • Port down and disabled in No_Sync

Example:

switchshow:
Index Slot Port Address Media  Speed        State    Proto
============================================================
 213   10   21   67d540   id    N32   No_Sync     FC  Disabled

portshow 213
portDisableReason: None
portCFlags: 0x0
portFlags: 0x4021     PRESENT U_PORT DISABLED LED
LocalSwcFlags: 0x0
portType:  26.0
portState: 2    Offline  
Protocol: FC
portPhys:  5    No_Sync      portScn:   2    Offline   

sfpshow:
RX Power:    -9.0    dBm (125.7uW)
TX Power:    -40.0   dBm (0.1   uW) 

  • Port down, disabled, throttled and in No_Sync

Example:

switchshow:
Index Slot Port Address Media  Speed        State    Proto
============================================================
 383   12   47   67f7c0   id    N32   No_Sync     FC  Disabled (Port Throttled)

portshow 383
portDisableReason: None
portCFlags: 0x1
portFlags: 0x41     PRESENT U_PORT
LocalSwcFlags: 0x0
portType:  26.0
portState: 2    Offline  
Protocol: FC
portPhys:  5    No_Sync      portScn:   2    Offline   

sfpshow:
RX Power:    -3.1    dBm (494.9uW) 
TX Power:    -40.0   dBm (0.1   uW) 

  • This may require further analysis (supportshow / supportsave)

Additional Information

 

NetApp provides no representations or warranties regarding the accuracy or reliability or serviceability of any information or recommendations provided in this publication or with respect to any results that may be obtained by the use of the information or observance of any recommendations provided herein. The information in this document is distributed AS IS and the use of this information or the implementation of any recommendations or techniques herein is a customer's responsibility and depends on the customer's ability to evaluate and integrate them into the customer's operational environment. This document and the information contained herein may be used solely in connection with the NetApp products discussed in this document.