If a standard switch receives a pre-standard bpdu, it automatically start sending pre-standard bpdus itself. Of course, the other possibility would be that your standard switch is configured on the interface to send pre-standard bpdus.
PS: initially, we wanted to always auto-detect pre-standard switches. But in some cases, the auto-detection fails. That's why we had to add the interface command.
yes I agree, what I do not understand is why this new switch is doing it. it is a 3750 with new IOS. I am using a similar switch and IOS in my metro ring and it is acting fine. The receiving switch (which was already configured) was also sending and receving STD BPDU before the insertion of the new 3750 in the ring. The configuration of the swiches is consistent. so I dont understand why pre-STD BPDU are sent or received at all.
does this happen when an old switch model is used, older IOS and as u mentionned specifically configured interface ? what triggers PRE-STD BPDU's.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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