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Fibre Channel (SAN)

Posts: 0

Invalid Transmisssion words and CRC errors on ISL links

2 ISL ports that connect 2 McData 64 port directors are generating‘invalid transmission words" and CRC errors. In a 24 hour period the error count for 'Invalid Transmission Words" is on average 30 per day, w/ a high 60.The CRC errors average about 10 per 24 hour period. The errors only show up on one switch. The ports are on different ASICs. There is no trunking of ports on the switch. There seems to be no host impact that I am aware of. I do not have a fibre channel analyzer. I would be interested to know if there is a rule of thumb about "acceptable' number of these errors. My assumption is the root cause is high utilization on the ports. Any comments appreciated.

External Moderator
Posts: 5,594
Registered: ‎02-23-2004

Re: Invalid Transmisssion words and CRC errors on ISL links

Hi BRK6971,replace the SFP, probable but not sure one of this is defective and you get the CRC Error.


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