i have one fa port of a cat2924XL connected to another fa port of a cat2950. Both ports are configured for 100Mbps/full and 802.1Q trunking. They are connected via 2 patton vdsl modems (2 wire line) that are 802.1Q compatible(the manual says so!!).
2950 at one end shows no input or output errors.
2924 at the other end has many input errors, crc, frame and mainly many runts!!
Every 20 seconds or so i get LINK-4 error interface fa 0/8 is experiencing errors at the console
When i disabled dot1Q and put both ports not in trunk but in access mode, there were none runts errors but only very few crc (1 crc error per 2 seconds for 4Mbps traffic.
The LINK-4 error message, existed but more rare.
I tried 10Mb/half or 10Mb/full but the sane things were happening.
The modems must have some kind of ethernet settings on it I would check the setup info for the modems and try changing that end . If not able to be changed it may only accept autonegotiate which is maybe what you should try on both ends . If it only accepts auto then hardcoding the switchport will cause problems .
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