I was playing around with MST this evening and I had 2 switches joined in a MST region, and I had another switch (stand alone RSTP) connected to just one of those two switches using two connections (non-etherchannel). I was looking at different ways to influence root port selection on the RSTP stand alone switch. I noticed that when applying either of the following commands on the MST boundary switchports, they both had the same effect. My question is, is there a preference of using one command over the other in this situation, as the end result seemed to be the same in influencing root port selection on the stand alone RSTP switch.
spanning-tree mst 0 port-priority 0
spanning-tree port-priority 0
Sample output from RSTP switch root port:
SW3#sh spanning-tree int fa0/20 d
Port 20 (FastEthernet0/20) of VLAN0001 is root forwarding
Designated root has priority 0, address 001c.57ba.e880
Designated bridge has priority 0, address 001c.57ba.e880
Designated port id is 0.22, designated path cost 0
Link type is point-to-point by default, Peer is STP
Thanks in advance.