Hi

do find some useful info about Runts on 802.1Q port.

Runts on a 802.1Q trunk port.

A Catalyst 2900XL or 3500XL that receives a 64 or 66 byte 802.1Q encapsulated frame on a trunk port counts the frame as a runt. However, it continues to forward the frame.

This issue is commonly seen when you connect Cisco 7960 IP phones to the switch when using auxiliary (voice) VLANs.

This issue is cosmetic, and is due to an ASIC limitation.

It should not cause any degradation in the performance of the switch.

For more information, refer to Cisco bug ID CSCds32999 ( registered customers only) .

Cisco IOS Software Release 12.0(5.4)WC1 or later

About input errors ..

Input Errors

Input errors provide a count of any errors that occurred while trying to receive packets from this port. The counter includes both CRC and frame errors. However, it does not include ignored packets. This is a list of input errors:

CRC Errors: Occur when the received packets fail the CRC check.

Frame Errors: Occur when the receiving frame is not complete.

Ignored Counter: Counts the number of frames dropped on input due to resource exhaustion in the switch fabric.

Overruns Counter: Occurs when Inter-Frame Gaps (IFG) are too short. In this case, a new Ethernet frame arrives before the previous one is completely stored in shared memory.

http://www.cisco.com/en/US/products/hw/switches/ps607/products_tech_note09186a0080125913.shtml

regds