Understanding drop events on 6500

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Jul 20th, 2009
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We have a 6500 running CatOS.

The sh counters command under some ports on WS-X6148A-GE-TX module, show the rxHCDropEvents increasing constantly. I get any or poor information about this counter on Cisco.com. Could be this counter related to any exhausted ASIC on this group of ports? Could be any hardware problem? I put the sh counters output on the output interpreter without any good help.

Any help will be welcomed.

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pidoshi Mon, 07/20/2009 - 22:25
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What's the CatOS version and how does the rxTotalDrop counter on those ports look like..is that counter incrementing ?


thanks

Pinku

carl.arce Tue, 07/21/2009 - 09:05
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Hi Pinku, the CatOS version is:

WS-C6509-E Software, Version NmpSW: 8.4(5)

Copyright (c) 1995-2005 by Cisco Systems

NMP S/W compiled on Aug 3 2005, 13:13:36


System Bootstrap Version: 12.2

System Boot Image File is 'bootdisk:cat6000-sup32pfc3k9.8-4-5.bin'

System Configuration register is 0x2102


About the rxTotalDrop counter, I can't get it in the sh counters command nor in the sh tech. Maybe the CatOs version is the issue.


Here is the sh counters ouuput:

sh counters 8/16

64 bit counters

0 rxHCTotalPkts = 429016835

1 txHCTotalPkts = 492790446

2 rxHCUnicastPkts = 428274060

3 txHCUnicastPkts = 492788898

4 rxHCMulticastPkts = 735804

5 txHCMulticastPkts = 1271

6 rxHCBroadcastPkts = 6971

7 txHCBroadcastPkts = 277

8 rxHCOctets = 111749119327

9 txHCOctets = 484957525384

10 rxTxHCPkts64Octets = 230497

11 rxTxHCPkts65to127Octets = 420656748

12 rxTxHCPkts128to255Octets = 79824373

13 rxTxHCPkts256to511Octets = 36579941

14 rxTxHCpkts512to1023Octets = 50438749

15 rxTxHCpkts1024to1518Octets = 334076968

16 txHCTrunkFrames = 492789167

17 rxHCTrunkFrames = 429016834

18 rxHCDropEvents = 190754

32 bit counters

0 rxCRCAlignErrors = 0

1 rxUndersizedPkts = 0

2 rxOversizedPkts = 0

3 rxFragmentPkts = 0

4 rxJabbers = 0

5 txCollisions = 0

6 ifInErrors = 0

7 ifOutErrors = 0

8 ifInDiscards = 0

9 ifInUnknownProtos = 0

10 ifOutDiscards = 0

11 txDelayExceededDiscards = 0

12 txCRC = 0

13 linkChange = 0

14 wrongEncapFrames = 0

0 dot3StatsAlignmentErrors = 0

1 dot3StatsFCSErrors = 0

2 dot3StatsSingleColFrames = 0

3 dot3StatsMultiColFrames = 0

4 dot3StatsSQETestErrors = 0

5 dot3StatsDeferredTransmisions = 0

6 dot3StatsLateCollisions = 0

7 dot3StatsExcessiveCollisions = 0

8 dot3StatsInternalMacTransmitErrors = 0

9 dot3StatsCarrierSenseErrors = 0

10 dot3StatsFrameTooLongs = 0

11 dot3StatsInternalMacReceiveErrors = 0

12 dot3StatsSymbolErrors = 0

0 txPause = 0

1 rxPause = 0

Last-Time-Cleared


Any help to clarify this strange rxHCDropEvents increasing counter?




pidoshi Tue, 07/21/2009 - 09:31
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This seems to be cosmetic bug..rxHCDropevents accounts for Drops due to Broadcast supression (Storm Control feature) whereas 6148A doesn't support that feature and hence the counters ur getting seems to be inaccurate (it should be zero with this version of LC)...8.6(1) and higher should be able to address this issue.

Note :-

-You might wanna check Hw/Sw compatibility

-If this doesn't address the issue, you might wanna call TAC to get further assistance at the ASIC level..


cheers

Pinku

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