The trunk is I guess between the 2950 and the core switch right?
The portfast configuration you did on the ports leading to the hub are enough to get a temporary loop. However, BPDUs should flow through the hub and it should not last forever.
I don't know what you mean by "I have enabled bpdu... globally". If this is bpdufilter, then you might consider removing it (even if we put some safeguard into global bpdufilter configuration that, I think, should prevent a permanent loop in your scenario).
If you want to be notified about such a case, you can enable bpduguard, that will complain about receiving a BPDU on a user port.
So, are you saying the hub is connected to more than one port of the switch?
Or, are you saying that the hub has ports connected to itself (either directly or indirectly via other hubs)? Connecting a hub or hubs in a 'loop' is an incorrect configuration, as you now no doubt know.
Is this configuration something you are intentionally doing, or something your network users are doing?
As far as I know, there isn't any way for a switch to differentiate between a frame emitted from a workstation that's directly connected, and from a frame that has passed through a hub (setting aside the possibility that a directly connected workstation will likely be full-duplex).
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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