Configuring Multiple Spanning Trees - Edge-Core ECS3510-26P Management Manual

26-port fast ethernet layer 2 switch

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| Spanning Tree Algorithm

Configuring Multiple Spanning Trees

Use the Spanning Tree > MSTP (Configure Global) page to create an MSTP

instance, or to add VLAN groups to an MSTP instance.

"Spanning Tree Commands" on page 795

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

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 33 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

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:

Set the spanning tree type to MSTP

Enter the spanning tree priority for the selected MST instance on the

Spanning Tree > MSTP (Configure Global - Add) page.

Add the VLANs that will share this MSTI on the Spanning Tree > MSTP

(Configure Global - Add Member) page.

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.

These parameters are displayed:

MST ID – Instance identifier to configure. (Range: 0-4094)

VLAN ID – VLAN to assign to this MST instance. (Range: 1-4093)

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)

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