STP protocol and lowest MAC address.

sys_teck

hi guys/gals.

questions related to Network+ N10-005. To begin with, all bridges on the network share the same priority number, and so the bridge with the lowest MAC address becomes the root bridge. When it says lowest MAC address in relationship to STP, what does it mean?

Thanks

Dionex

I'm currently studying for N10-005 and if I understand your question correctly. Your STP question relates to multiple switches on the same lan using STP and root bridge election. STP chooses the root bridge base on switch priorities if the switches have the same Priority then root bridge is choose by the MAC address (Physical address) with the lowest number. Which is it's BID IDK I could be wrong but that is my understanding.

sys_teck

hi Dionex

Thank you for your reply. From my understanding lowest/highest MAC address means lowest/highest priority.

no!all!

By default cisco switches have a default priority of 32768. The BID is a combination of the MAC and priority number. The switch with the lowest BID will become the root. Does Network+ cover STP now??

sys_teck

No!all! Thank you short clear explanation

Yes it does. I think Net + has some overlap with Cisco CCENT/CCNA, that is why Net+ covers STP.

karthikheb

sys_teck wrote: »

No!all! Thank you short clear explanation

Yes it does. I think Net + has some overlap with Cisco CCENT/CCNA, that is why Net+ covers STP.

Just remember that for STP, root bridge = low ! And you should be golden !