Increasing Transmit CRC Error Count on 10Gb Sun Ethernet switch Interfaces

Asset ID:	1-72-1598748.1
Update Date:	2017-12-20
Keywords:

Solution Type Problem Resolution Sure

Solution 1598748.1 : Increasing Transmit CRC Error Count on 10Gb Sun Ethernet switch Interfaces

Applies to:

Sun Network Switch - Version All Versions and later
Sun Blade 6000 10GbE Switched 24p NEM - Version Not Applicable and later
Information in this document applies to any platform.

Symptoms

Show interface outputs show the following symptom. This can be seen on other interfaces and on other switches in the fabric.

Transmission Counters
Octets                    : 3036906300
Unicast Packets           : 1060962978
Discarded Packets         : 0
Error Packets             : 210226
Bad CRC                   : 210226<<<<<<<<<<<<<<<<<<<<<<<<<<Increasing run the show interface several times to see if this value is increasing
Error Drops               : 0
Timeout Drops             : 0

Cause

The Oracle 10Gb ethernet switches are cut through switches.

cut-through switches will begin forwarding a frame out on the egress interfaces
before the full frame is received on the ingress. By the time the FCS field at the
end of the frame is received, the beginning off the frame has already been transmitted
and is on the wire. When the switch calculates the CRC and finds a mismatch it will
increase the transmit CRC counter. Some causes could include poor physical connections,
duplex/speed mismatch on the fabric or a known defect such as bug 17278618 (fixed in 1.2.2.3 or higher).

Solution

Insure that firmware version 1.2.2-3 or higher is installed on 10Gb 72p and 24p NEM using the sefos command show system-information

    opus-bur09-b SEFOS# show system info
      Hardware Version                  : 2.5.8_00209384
      Firmware Version                  : TOR-1.2.2.3<<<<<<<<<<<<<<<Insure 1.2.2.3 or higher
Check 10Gb switch fabric for poor connections, mismatched duplex and speed and anything that might cause a CRC error.

Some commands to check connection error counters may include the following:

Solaris:# kstat -p igb:# (use appropriate interface and instance for interface connected to 10gb switch)
Linux: #ethtool -s eth# (# is the interface that is connected to 10Gb switch)
Cisco: #show interface tengigabitEthernet 0/1 (0/1 is the interface connected to Oracle switch)
SEFOS: #show interface outputs

To see more detailed packet counters from SEFOS, RMON can also be used. See
docs.oracle.com.

RMON Administration Guide

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