01-08-2010 12:40 AM
We have many "disc c3" errors on two ISL links.
What can be the reason for that?
frames enc crc crc too too bad enc disc link loss loss frjt fbsy
tx rx in err g_eof shrt long eof out c3 fail sync sig
0: 2.1g 2.9g 0 1 0 0 0 0 5 23k 0 1 4 0 0
1: 1.7g 2.2g 0 0 0 0 0 0 3 21k 0 1 4 0 0
01-11-2010 10:03 PM
this is the same level than we have. Did the discards came after the update?
I have seen this discards on many 4 Gbit switches. It looks like that Brocade had changed the Buffer handling on the 4 Gbits, so that ISLs are now overloaded with the same throught put as before. The only solution was to add an ISL to increase the amount of buffers, on the affected trunks, because we didn't have extended Fabric lic to add more buffers to the ISLs.
We didn't use QoS in the fabric. The Support told us to disable on the ISLs port the QoS function but this did not help.