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

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## Configure the Pseudo Root ID

If a port is configured as a L2GP, the configured pseudo root ID is used to generate and present the Pseudo BPDU to MSTP state machines, as if received from another bridge.

- Map VLANs to an MST instance, specify the BPDU transmit status interface, and configure the pseudo root ID of the L2GP.

      SEFOS# configure terminal
      SEFOS(config)# spanning-tree mst configuration
      SEFOS(config-mst)# instance 1 vlan 1
      SEFOS(config-if)# exit
      SEFOS(config)# interface extreme-ethernet 0/1

  Valid interfaces include physical interfaces and `port-channel` logical interfaces (`port-channel` port-channel-number).

      SEFOS(config-if)# spanning-tree pseudoRootId priority 4096 mac-address 00:01:02:03:04:01
      SEFOS(config-if)# spanning-tree mst 1 pseudoRootId priority 8192 mac-address 00:01:02:03:04:02

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