Runts error on 6500 Switch running in CAT OS

[thiyagarajankalaiselvan]

Hi All,

On Cisco 6500 Cat OS switch, below 2 log messages are getting recorded very often.

Error message 1:%SYS-3-PORT_IN_ERRORS:Port 9/39 detected 4729 input error(s) in last 30 minutes

Error message 2: %SYS-3-PORT_RUNTS:Port 9/39 detected 4442 runt(s) in last 30 minutes

Can anybody help me to reduce/stop these error messages?

Does it cause any packet loss?

Regards,

Thiyagarajan

[Giuseppe Larosa]

Hello Thiyagarajan,

what is connected on port 9/39?

the errored frames are discarded. The impact depends on how many valid frames are received in the same 30 minutes

runt errors are frames that are too small (less then 64 bytes) this can mean the NIC of connected device is faulty.

runts

Number of packets that are discarded because they are smaller  than the minimum packet size of the medium.

http://www.cisco.com/en/US/docs/ios/interface/command/reference/ir_s4.html#wp1020803

see also

http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a008015bfd6.shtml

Hope to help

Giuseppe

[Ganesh Hariharan]

Hi All,
On Cisco 6500 Cat OS switch, below 2 log messages are getting recorded very often.
Error message 1:%SYS-3-PORT_IN_ERRORS:Port 9/39 detected 4729 input error(s) in last 30 minutes
Error message 2: %SYS-3-PORT_RUNTS:Port 9/39 detected 4442 runt(s) in last 30 minutes
Can anybody help me to reduce/stop these error messages?
Does it cause any packet loss?
Regards,
Thiyagarajan

Hi Thiyagarajan,

As per the message it can be poosible that a port error has been detected on the port.These error messages are used to track the interface errors
using the port counter error detection. To turn off this feature, issue the 'set errordetection portcounters disable' command.

But recommended Action is these error indicates a bad cabling/patch panels, or bad NICs in some cases. Use the show mac and/or show port commands to identify the incrementing error counter. Check the duplex settings, MTU and/or cabling between these ports and their destination devices.

and check out the below link for troubleshoot the errors on ports

http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a008015bfd6.shtml

Hope to Help !!

Ganesh.H

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[vvasisth]

Runts, FCS, Alignment errors are all related to layer 1.  These errors are commonly caused by duplex mismatch and sometimes caused by  
bad hardware (NIC, cable or port) or the connected device sent out frames which is less than 64 bytes and/or with bad CRC.

Check the configuration, if the port is set to 100/Full.  For the first step, can you please configure this port to auto/auto and then check  
the port again ("show port " and "show config") to see if the  port comes up with half duplex or full duplex?  This result will let  
us know if the port and the device connected to it are both set up correctly.

Here is a reference URL...

http://www.cisco.com/warp/customer/473/53.shtml