problem encountered between 3com 4950 to catalyst 500

5 pts.
Tags:
3Com 4950
3Com switches
Cisco 500
Cisco switches
Network connectivity
Switch configuration
Switches
I encountered a problem between the connection of 3 com (4950) to catalyst express 500. 3 com is located in the server room and act as our distribution switch, from server room it is connected to catalyst 500 using fiber optic cable (multi mode). I connect the 3 com to the sfp uplink of the catalyst 500 after 1 minute the connection will disconnected (from gree light it will become orange then it will turn off). i already configure the catalyst uplink as a switch but still i encountered this problem. So i think may be there is a conflict between 3 com and catalyst,what i did is i used extra switch so instead to connect 3com to catalyst, the connection become 3com to 3com then i connect 3com to catalyst using rj45. but still i encountered a problem, everytime the 3com distribution switch hanging the catalyst will also hanging, and when the 3 com already working still the 3 com is still hanging. so i need to restart the catalyst so that it will work. pls help me to solve this issue.tnx

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Sounds to me like spanning tree issues. I think the 3Com is probably a single spanning tree for all vlans, and the Cisco is per vlan spanning tree. The Cisco ‘sees’ it’s own bpdus, or those from another Cisco switch you have on the network which is running VLANs, and shuts the port down.

Provided the Catalyst 500 is only used for end devices, and not on linking to other switches, you can safely turn off spanning tree on the switch. Try it and see if the link stays up.

Just a guess, but I have seen sometihng similar on other switches where Cisco was connected to 3Com. It’s not really a compatibility issue, just a different way of doing the same thing. Please post back with any results.

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