Designated Root Port points you in the direction of the Root Bridge. In this case, look upstream to what's connected to your interface 3/1-2 (looks like an EtherChannel uplink to me).
Designated Root Cost can also give you an idea how far you are from the Root Bridge. It is the sum of all the Path Costs between the switch in your example, and the Root Bridge. Assuming that they're all Cisco switches, a Root Cost of 12 could be telling you that you are 3 Gigabit Ethernet hops away from the Root Bridge. (GigE Path Cost default is 4.)
Work your way from that switch back toward the Root Bridge; the Designated Root Cost should diminish as you go.
When you get to the switch whose Bridge ID MAC ADDR matches the Designated Root, you will have found yourself the Root Bridge.
Not knowing what switches or routers you're using, it's possible that you may have some sort of bridging functionality enabled on a module within a chassis. But following the path to the Root Bridge in this way will get you closer to it.
Your attention is called to the fact that the firms and numbers listed may not always be obvious in product implementation. Some manufacturers subcontract component manufacture and others include registered firms' OUIs in their products.
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.