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| Sun Ethernet Fabric Operating System ### STP Administration Guide

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## Restart the Protocol Migration Process

SEFOS MSTP detects the spanning tree version on a LAN and sends out the equivalent BPDU. If this switch receives a legacy IEEE 802.1D configuration BPDU (a BPDU with the protocol version set to 0), MSTP sends only IEEE 802.1D BPDUs on that port.

SEFOS MSTP supports the force version feature, where a switch supporting MSTP is forced to behave as STP or RSTP. However, the switch does not automatically revert to the MSTP mode if it does not receive IEEE 802.1D BPDUs, because the switch cannot determine whether the legacy switch has been removed from the link unless the legacy switch is the designated switch.

- Type one of these commands.

  - To restart the protocol migration process on the switch, type.

        SEFOS# clear spanning-tree detected-protocols

    This command forces renegotiation with neighboring switches.

  - To restart the protocol migration process on a specific interface, type.

        SEFOS# clear spanning-tree detected-protocols interface interface-id

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