It Should be A.
Bridge Priority must be in increments of 4096.
Allowed values are:
0 4096 8192 12288 16384 20480 24576 28672
32768 36864 40960 45056 49152 53248 57344 61440
A priority of 30000 is invalid.
While this is true, I wouldn't suggest trying to read into it so deeply. The priority is invalid because the 4 highest bits of the BPDU Bridge Priority field are reserved for the priority number, while the remaining 12 are reserved for VLANs, meaning the minimum value by which a priority bit can be set or changed is 4096.
The configurations in the question aren't just invalid, they're impossible. A network in this state could not exist - it's physically impossible - and therefore no answer could be correct.
So it's obvious we just need to take it at face value, and realize they're just trying to ensure we understand the rules of STP root bridge selection, i.e. Bridge Priority > MAC Address.
" When the switch is in PVST+ mode without MAC address reduction enabled, you can enter a bridge priority value between 0-65,535. The VLAN bridge ID priority becomes that value.
When the switch is in PVST+ mode with MAC address reduction enabled, you can enter one of 16 bridge priority values: 0, 4096, 8192, 12,288, 16,384, 20,480, 24,576, 28,672, 32,768, 36,864, 40,960, 45,056, 49,152, 53,248, 57,344, or 61,440. "
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4000/8-2glx/configuration/guide/spantree.html
Since no mode is specified in the quesion, 30000 seems valid.
Agreed but... I assume they meant say that the invalid priorities are valid (Not sure ) I am thinking we should use the valid priorities numbers ...........
Just accept whatever specified in the question. Don't dig into it. The question says the priority is set to 30000 even if it can't be. Lower priority gets first.
so the priority is looked at first right... so its between S3 and S2.
then the lower MAC is chosen which is S3 cz all Cs rather than Bs.
What im i missing?
LOWEST PRISORITY IS THE SAME 30000 BETWEEN 2 ROUTERS, SO IT WILL CHOOSE THE LOWEST MAC ADDR. WHICH IS B
upvoted 3 times
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