STP and RSTP

Spanning Tree Protocol (STP),
Rapid Spanning Tree Protocol (RSTP),
Multiple Spanning Tree Protocol (MSTP), and
VLAN Spanning Tree Protocol (VSTP)

https://www.juniper.net/documentation/en_US/junos/topics/reference/command-summary/show-stp-interface-command.html

OLD:

https://www.juniper.net/documentation/en_US/junos/topics/reference/command-summary/show-spanning-tree-interface-spanning-trees-ex-series.html

OLD:

https://www.juniper.net/documentation/en_US/junos12.3/topics/concept/mx-series-rstp-port-states-roles.html