ge0/1 on the 3550 seems to be receiving two kinds of bpdus.
-Some MST bpdus from region, with better information (root port).
-Some RSTP bpdus, probably tagged (probably coming from a switch running Rapid-PVST).
What is exactly g0/1? What is it connected to? Is is a shared segment (or it is connected to an emulated LAN with different peers?). You usually expect a single peer from a point-to-point link.
Another possibility is that this port is connected to a third party bridge that floods PVST+ bpdus. In that case, the bpdus that are causing this flapping you see in the debug may be caused by some remote devices sending PVST+ bpdus (again, probably some Rapid-PVST devices) across the L2 network handled by the third party boxes.
Thank you Francois. I have found the reason of the arisen problem. It's remote-span vlan 706 on 3560GS2 for monitoring some ports. This vlan was allowed between 3560GS2 and 3550. I blocked it, but I want monitoring ports traffic and my server wouldn't connect to 3560GS2. I shall search for the decision of this problem. Thanks once again Francois, good luck:)
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.