Technical Documentation




Hierarchy Level

[edit protocols mstp interface (all | interface-name)],
[edit protocols rstp interface (all | interface-name)],
[edit protocols stp interface (all | interface-name)],
[edit protocols vstp vlan vlan-id interface (all | interface-name)]

Release Information

Statement introduced in JUNOS Release 9.1 for EX Series switches.

Statement updated in JUNOS Release 9.4 for EX Series switches to add VSTP support.


Configure an interface to be a spanning tree designated port. If the bridge receives superior STP bridge protocol data units (BPDUs) on a root-protected interface, that interface transitions to a root-prevented STP state (inconsistency state) and the interface is blocked. This blocking prevents a bridge that should not be the root bridge from being elected the root bridge. When the bridge stops receiving superior STP BPDUs on the root-protected interface, interface traffic is no longer blocked.

Required Privilege Level

routing—To view this statement in the configuration.
routing-control—To add this statement to the configuration.

Published: 2009-07-28