07-21-2010 02:45 AM
I have 2 x 4G FC DWDM Circuits connected to the ports from same ASIC truncked.. connected b/w 2 DC's sharing resources b/w DC's.
Seeing lot n incresing CRC and Invalid_words errors on the E_Ports (inter connected b/w DC's) where DWDM link is connected.
Actions taken :
replace of FC cables on all places,
replaced SFP on the Switch end
checked DWDM link -looks fine
Hardware compatibility b/w SAN switch and MUX
any other options to stop these CRC errors and Invalid_words on port end.
07-21-2010 07:39 AM
CRC errors can traverse through the fabric and even propagate through the DWDM across the DC's. So a port generating CRC errors in one DC can cause errors to be observed on ports across all ISL's in the other.
You will have to look at incrementing counters on all switches, clear stats and keep looking for the culprit port.
Since this is a lot of effort take switches in batches and observe stats on the ISL. Excerpts from a recent post of mine might help.