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Fibre Channel (SAN)

Posts: 0

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. 



Regular Contributor
Posts: 166
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
Brocade Distinguished Architect The Fibre Channel blog

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