3 Configuring the Switch

To use multiple spanning trees:1.Set the spanning tree type to MSTP (STA Configuration, page 3-116).

2.Enter the spanning tree priority for the selected MST instance (MSTP VLAN Configuration).

3.Add the VLANs that will share this MSTI (MSTP VLAN Configuration).Note: All VLANs are automatically added to the IST (Instance 0).

To ensure that the MSTI maintains connectivity across the network, you must configure a related set of bridges with the same MSTI settings.

Command Attributes

MST Instance – Instance identifier of this spanning tree. (Default: 0)

Priority – The priority of a spanning tree instance. (Range: 0-61440 in steps of

4096; Options: 0, 4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864,40960, 45056, 49152, 53248, 57344, 61440; Default: 32768)VLANs in MST Instance – VLANs assigned this instance.MST ID – Instance identifier to configure. (Range: 0-4094; Default: 0)VLAN ID – VLAN to assign to this selected MST instance. (Range: 1-4094)

The other global attributes are described under “Displaying Global Settings,” page 3-113.The attributes displayed by the CLI for individual interfaces are described under “Displaying Interface Settings,” page 3-120

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