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(page 3-164) with the same set of instances, and the same instance (on each
bridge) with the same set of VLANs. Also, note that RSTP treats each
MSTI region as a single node, connecting all regions to the Common
Spanning Tree.
To use multiple spanning trees:
1. Set the spanning tree type to MSTP (STA Configuration, page 3-161).
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: 1-4093)
The other global attributes are described under “Displaying Global Settings,”
page 3-157. The attributes displayed by the CLI for individual interfaces are
described under “Displaying Interface Settings,” page 3-166