Fibre Channel (SAN)

Reply
Occasional Contributor
Posts: 9
Registered: ‎10-11-2005

disc c3 errors on ISL

Hello,

We have many "disc c3" errors on two ISL links.

What can be the reason for that?

stfgre12:admin> porterrshow
        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

Thanks!

brgds

Mario

Occasional Contributor
Posts: 11
Registered: ‎07-12-2005

Re: disc c3 errors on ISL

Which FOS Code are you running? I have seen this after an update from 5.x to 6.x.

I have added an ISL and everthing was fine.

Occasional Contributor
Posts: 9
Registered: ‎10-11-2005

Re: disc c3 errors on ISL

Hi,

We use FOS v6.2.0e on our switches.

Thanks!

Mario

Occasional Contributor
Posts: 11
Registered: ‎07-12-2005

Re: disc c3 errors on ISL

Hi Mario,

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.

Regards,

Andreas

Join the Community

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