MSTP backwards compatible with RSTP. MSTP instance 0 (CIST) = RSTP.

STPG (ERS)

spanning-tree stp 1 priority 1000 (primary root bridge)
OR
spanning-tree stp 1 priority 2000 (backup root bridge)

Interface Ethernet ALL
spanning-tree port 1 learning normal
spanning-tree port 2-48 learning fast
Exit