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PANNING
T
REE
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LGORITHM
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ONFIGURATION
3-135
By default all VLANs are assigned to the Internal Spanning Tree
(MST Instance 0) that connects all bridges and LANs within the MST
region. This switch supports up to 65 instances. You should try to group
VLANs which cover the same general area of your network. However,
remember that you must configure all bridges within the same MSTI
Region (page 3-125) 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 3-122).
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)