I connected an Alcatel 4400 PBX and a Cisco Catalyst 2924 switch via Fastethernet interface. I checked the counters on this interface and I found a lot of runt frames. I knew that the Ethernet interface of Alcatel PBX is 10Mbps half-duplex therefore I changed the interface of the 2924 to 10Mbps Half-duplex. The result was the same. I changed the cable but it didn't help.
I don't know what is to be done. What can I do? Is there any solution to avoid these runt frames?
A runt frame is generally the fragments of a collision. The defintion of a runt is a frame smaller than the media's allowed min frame size which in your case is 64 bytes. This could also mean a faulty port that is just placing junk out on the wire but more likely it is the affect of collisions so hence if possible try and set interfaces to full duplex.
Also do make sure you are within the ethernet physical spec for cable distances etc.
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