Im aware this port cost of '3019' is some default setting and maybe increase but where does it come from or how is it calculated?
Im aware of out of the box switch is set to default Bridge id of: 32768
Im aware adding the command - spanning-tree vlan 1,20,21 priority 4096 to be set on a master and backup as '8192'
or the alternative method is:
spanning-tree vlan 1-4094 root primary
spanning-tree vlan 1-4094 root secondary
Although i have NOT got a clue as to why there are 2 lots of commands, as they must be for a 'SPECIFIC' scenario but NO ONE KNOWs as the words Ive read only make reference to the both but never specifically say what the diference is, or is it down to a specific IOS being used as to what commands are excepted.
Just would like to know this 'USELESS' piece of information!!