Drops protocols in router 2821

[spinning2008]

Hello, I'm Mauro, can someone help me?. I have a problem in a giga interface in , the interface has a lots of drops protocols.

[paolo bevilacqua]

That is normal, and does not cause any problem. No traffic of your own is being dropped.

[spinning2008]

Thanks  a lot Paolo I appreciate your help.

This problem could be the ios, the cdp or DTP? This router is connected to 3560 switch in both the cdp run is running. But this drops can produce slow connection???, In the 3560 we only have PC with IP phones.

This is the flash: 

PRINCIPAL_10MB#show ver

Cisco IOS Software, 2800 Software (C2800NM-ADVENTERPRISEK9-M), Version 12.4(24)T, RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2009 by Cisco Systems, Inc.

Compiled Wed 25-Feb-09 17:54 by prod_rel_team

ROM: System Bootstrap, Version 12.4(13r)T11, RELEASE SOFTWARE (fc1)

PRINCIPAL_10MB uptime is 15 weeks, 5 days, 18 hours, 26 minutes

System returned to ROM by power-on

System image file is "flash:c2800nm-adventerprisek9-mz.124-24.T.bin"

2539842 packets output, 1262223493 bytes, 0 underruns

     0 output errors, 0 collisions, 0 interface resets

     2179444 unknown protocol drops          < ======================  unknown protocol

     172959793 unknown protocol drops       < ======================

     0 babbles, 0 late collision, 0 deferred

     0 lost carrier, 0 no carrier, 0 pause output

Thanks,

Regards.

Mauro.

[paolo bevilacqua · Accepted solution]

These are actually STP packets. As mentioned above, It's normal and doesn't cause any problem.

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[spinning2008]

Paolo, How Can I prevent these STP packets?

[paolo bevilacqua]

You should not prevent them, they do not cause any problem and are part of normal switch operation.

[spinning2008]

Thanks Paolo.

Regards.

Mauro.

[paolo bevilacqua]

You're welcome, thanks for the nice rating and good luck!