Installation manual

3-171
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Web – Click Spanning Tree, STA, Port Configuration or Trunk Configuration. Modify the
required attributes, then click Apply.
Figure 3-95 Configuring Spanning Tree per Port
CLI – This example sets STA attributes for port 7.
Configuring Multiple Spanning Trees
MSTP generates a unique spanning tree for each instance. This provides multiple
pathways across the network, thereby balancing the traffic load, preventing wide-scale
disruption when a bridge node in a single instance fails, and allowing for faster
convergence of a new topology for the failed instance.
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 9
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 3-133) 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.
Note:
Multiple spanning trees must be configured through the command line interface for the
current software release (see page 4-216).
To use multiple spanning trees:
1. Set the spanning tree type to MSTP (STA Configuration, page 3-130).
2. Enter the spanning tree priority for an MST instance (MSTP VLAN Configuration).
3. Add the VLANs that will share this MSTI (MSTP VLAN Configuration).
Console(config)#interface ethernet 1/7 4-186
Console(config-if)#no spanning-tree port-bpdu-flooding 4-231
Console(config-if)#spanning-tree port-priority 0 4-229
Console(config-if)#spanning-tree cost 50 4-227
Console(config-if)#spanning-tree link-type auto 4-231
Console(config-if)#no spanning-tree edge-port 4-229
Console(config-if)#