Fibre Channel (SAN)

New Member
Posts: 1
Registered: ‎08-06-2015

What does this error mean (N8 No_Sync FC Disabled (Port Throttled))



I have brocade DS6510B and from switchshow, I can see an error in one of the ports.

xx xx 012400 id N8 No_Sync FC Disabled (Port Throttled)

admin> portshow xx
portIndex: xx
portName: portxx
portHealth: No Fabric Watch License
Authentication: None
portDisableReason: Port Throttled
portCFlags: 0x0
LocalSwcFlags: 0x0
portType: 24.0
POD Port: Port is licensed
portState: 2 Offline
Protocol: FC
portPhys: 5 No_Sync portScn: 2 Offline
port generation number: 18
state transition count: 9
portId: 012400
portIfId: 43020023
portWwn: xx:xx:xx:xx:xx:xx:xx:xx
portWwn of device(s) connected:
Distance: normal
portSpeed: N8Gbps
FEC: Inactive
Credit Recovery: Inactive
LE domain: 0
Peer beacon: Off
FC Fastwrite: OFF
Interrupts: 0 Link_failure: 3 Frjt: 0
Unknown: 0 Loss_of_sync: 0 Fbsy: 0
Lli: 3532 Loss_of_sig: 4
Proc_rqrd: 357 Protocol_err: 0
Timed_out: 0 Invalid_word: 1964204
Rx_flushed: 0 Invalid_crc: 0
Tx_unavail: 0 Delim_err: 0
Free_buffer: 0 Address_err: 0
Overrun: 0 Lr_in: 4
Suspended: 0 Lr_out: 4
Parity_err: 0 Ols_in: 4
2_parity_err: 0 Ols_out: 4
CMI_bus_err: 0
Port part of other ADs: No


This started to fail when we replaced the fiber cable with a new one. Disabling/enabling the port did not help. What's weird is even if we re-use the original fiber cable that was working, the port is still down.

By the way, the negotiated speed when it was working was N4. 



Frequent Contributor
Posts: 133
Registered: ‎02-05-2014

Re: What does this error mean (N8 No_Sync FC Disabled (Port Throttled))

Most likely disabled due to a fillword issue.


Check if the port fillword is set to either 1, 2 or 3 if it connects on 8G.


portcfgfillword <port #> 2


The problem is this:

Timed_out: 0 Invalid_word: 1964204


If you want to know more about fillwords look here:


Good luck.

Kind regards,
Erwin van Londen
Former Brocade Distinguished Architect The Fibre Channel blog

Join the Community

Get quick and easy access to valuable resource designed to help you manage your Brocade Network.