User manual

HAPTER

| Configuring the Switch

Configuring the Spanning Tree Algorithm

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WEB INTERFACE

To configure global settings for STA:

1. Click Configuration, Spanning Tree, Bridge Settings.

2. Modify the required attributes.

3. Click Save.

Figure 48: STA Bridge Configuration

CONFIGURING

MULTIPLE SPANNING

TREES

Use the MSTI Mapping page to add VLAN groups to an MSTP instance

(MSTI), or to designate the name and revision of the VLAN-to-MSTI

mapping used on this switch.

PATH

Basic/Advanced Configuration, Spanning Tree, MSTI Mapping

COMMAND USAGE

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 Common Internal Spanning Tree

(CIST, or MST Instance 0) that connects all bridges and LANs within the

MST region. This switch supports up to 7 instances. You should try to group

VLANs which cover the same general area of your network. However,

remember that you must configure all bridges that exist within the same

MSTI Region 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 CIST.