11-04-2005 02:12 AM - edited 03-03-2019 12:40 AM
I have a Catalyst 2950, IOS version 12.1(20)EA1a, with the following log messages:
SCHAN ERROR INTR: unit=1 SRC=6 DST=5
OPCODE=20 ERRCODE=5
SCHAN ERROR INTR: unit=1 SRC=6 DST=5
OPCODE=20 ERRCODE=5
SCHAN ERROR INTR: unit=1 SRC=6 DST=5
OPCODE=20 ERRCODE=5
SCHAN ERROR INTR: unit=1 SRC=6 DST=5
OPCODE=20 ERRCODE=5
As a result, the c2950 became unreachable and I had to reload it.
I can't find any information on cisco.com. Is it an hardware problem?
Does the 2950 need to be replaced?
Thanks
Stefano
Solved! Go to Solution.
11-04-2005 03:03 AM
Hi Stefano,
Yhere are the details you could be hitting the following bug:
CSCdv83336 Bug Details
Under certain level of traffic load, the switch will start logging the
following messages on the console:
SCHAN ERROR INTR: SRC=6 DST=5 OPCODE=20 ERRCODE=5
and after a few seconds, the switch will stop passing any traffic. In some
cases, the switch seemed still forwarding broadcast and multicast traffic,
which will cause STP problem if the switch has redundant link and is not
supposed to be the root for the VLAN, as both port will go forwarding.
The same error message has been identified in CSCdu87836.
An assessment of the impact
Unit stops passing any traffic.
WORKAROUND
Several units were returned by CISCO. The units were re-screened to the
latest test program, and failed the SDRAM memory test.
Customer should RMA unit back to Cisco.
HTH
Ankur
11-04-2005 02:57 AM
HI Stefano,
Its a bug and you have to replace your hardware.
I will try to find the bug inf for you.
Regards,
Ankur
11-04-2005 03:03 AM
Hi Stefano,
Yhere are the details you could be hitting the following bug:
CSCdv83336 Bug Details
Under certain level of traffic load, the switch will start logging the
following messages on the console:
SCHAN ERROR INTR: SRC=6 DST=5 OPCODE=20 ERRCODE=5
and after a few seconds, the switch will stop passing any traffic. In some
cases, the switch seemed still forwarding broadcast and multicast traffic,
which will cause STP problem if the switch has redundant link and is not
supposed to be the root for the VLAN, as both port will go forwarding.
The same error message has been identified in CSCdu87836.
An assessment of the impact
Unit stops passing any traffic.
WORKAROUND
Several units were returned by CISCO. The units were re-screened to the
latest test program, and failed the SDRAM memory test.
Customer should RMA unit back to Cisco.
HTH
Ankur
11-04-2005 03:08 AM
Thanks a lot!
Stefano
11-04-2005 03:26 AM
Hi Ankur,
in our network there are hundreds of c2950.
Is this bug affecting particular groups of serial numbers?
Thanks
Stefano
11-04-2005 03:39 AM
HI Stefano,
This is a bug and there is no feild notice for the same so I do not think that there is group of serial numbers which are affected but yes on any switch if you get this error you can open a TAC and get it replaced from Cisco.
HTH
Ankur
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