01-19-2010 11:23 AM - edited 03-06-2019 09:21 AM
Hello!
Jan 19 20:57:46 MSK: %SIBYTE-DFC3-4-SB_EXCESS_COLL: Excessive collisions on mac 1 (count: 263)
Jan 19 20:57:46 MSK: %SIBYTE-DFC8-4-SB_EXCESS_COLL: Excessive collisions on mac 1 (count: 268)
Jan 19 20:57:46 MSK: %SIBYTE-DFC7-4-SB_EXCESS_COLL: Excessive collisions on mac 1 (count: 255)
Cisco 7609 with RSP720. Unforutantely I was unable to find this type of message on cisco.com. Does anybody know what does this exaclty mean?
P.S. All I gat is the only link http://www.cisco.com/en/US/products/hw/modules/ps2033/products_tech_note09186a008009446d.shtml#topic5
Thanks.
Peter.
01-19-2010 12:00 PM
Hi Peter,
Here is the explanation of the messages.
%SIBYTE-DFC4-4-SB_EXCESS_COLL: Excessive collisions on mac 1 (count: 1)
These messages basically mean that excessive collisions have occurred on the MAC
interface.
A small number of excessive collisions is not a problem at all. It is the nature of
bus-based Ethernet. The reason you saw the message message maybe because you have configured
the "service internal" on your switch. If you change the configuration (no service
internal), he will not see the error message at all.
With service internal mode off, the system will only print out such message whenever the
excessive collision reaches a certain fixed threshold. In this case, the appearance of
this message may indicate a real collision case.
With the service internal mode on, the system will print out such message whenever there
is one instance of excessive collision. It may be caused by some hardware noise. The
occasional appearance of this message with service internal mode on is a normal behavior.
I hope this information could help you.
Itzcoatl Espinosa
04-18-2011 10:39 PM
hi
thx for the explantion. But what kind of interface is mac 1 on a 6509 with SUP720?
Regards
Artur
04-19-2011 02:15 AM
Could it be a device slot no.?
04-19-2011 02:25 AM
Hi
yes would make sense... I've got 2 messages:
1711390: Feb 21 11:04:21 GMT: %SIBYTE-DFC2-4-SB_EXCESS_COLL: Excessive collisions on mac 1 (count: 8311)
1711391: Feb 21 11:04:52 GMT: %SIBYTE-DFC1-4-SB_EXCESS_COLL: Excessive collisions on mac 1 (count: 9189)
04-19-2011 03:38 AM
Artur,
Good question...
Well, I was told that if there're not too much collisions on counters - it's OK. Otherwise - you have to do something.
04-21-2011 07:40 AM
in the end i openend a TAC case:
it a collision on the out-of-band-ethernet management bus (EOBC) for the line cards only. it is not critical. you can disable it with command no service internal.
Regards
Artur
07-13-2019 07:02 AM
Hi - can any one help i am having the same error message- what is it
EXCESS_COLL: Excessive collisions on mac 1 (count: 3701)
07-13-2019 07:03 AM
what is the cause of this
121127: Jul 12 19:31:35.236 UTC: %SIBYTE-DFC1-4-SB_EXCESS_COLL: Excessive collisions on mac 1 (count: 4510)
121128: Jul 12 19:31:35.356 UTC: %SIBYTE-DFC2-4-SB_EXCESS_COLL: Excessive collisions on mac 1 (count: 4059)
121129: Jul 12 19:31:35.360 UTC: %SIBYTE-DFC8-4-SB_EXCESS_COLL: Excessive collisions on mac 1 (count: 3298)
121130: Jul 12 19:31:35.520 UTC: %SIBYTE-DFC4-4-SB_EXCESS_COLL: Excessive collisions on mac 1 (count: 1397338)
121131: Jul 12 19:31:35.628 UTC: %SIBYTE-DFC3-4-SB_EXCESS_COLL: Excessive collisions on mac 1 (count: 1396399)
121132: Jul 12 19:31:35.276 UTC: %SIBYTE-DFC7-4-SB_EXCESS_COLL: Excessive collisions on mac 1 (count: 3701)
07-13-2019 08:09 AM
It seems to me that a previous post was pretty clear about the cause of this and about what to do to resolve it
it a collision on the out-of-band-ethernet management bus (EOBC) for the line cards only. it is not critical. you can disable it with command no service internal.
What causes this error - it is a collision on the management bus and so does not impact user traffic.
Is it an important error - no it is not important.
How to resolve it - configure no service internal
HTH
Rick
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