connection assue between cisco and 3com switch,thanx!

[parazhang]

I have a 3com superstack 3300 switch,and using one fast ethernet port connect to a cisco catalyst 2950-24 switch,the cisco 2950-24 switch connect to a cisco catalyst 6506 using one fast ethernet port by 802.1Q trunking mode.PCs in diffirent VLANs connect to the 3com switch and then go to Internet through cisco 6506.
But the question is : when I ping the pc that connect to the 3com switch,many packets lost,may be the compatible problem between 3com and cisco switch or the problem of the trunk between two cisco device???

best regards,thanx!

 

[baddos]

Do a "show interface" on the interface connecting to the 3com switch and see if there is any errors reporting on that port. Also, telnet into the 3com and check out the statistics under the "ethernet" menu to see if you see any errors there. It sounds like there might be a port speed/duplex misconfiguration problem.