User manual

APS User Manual

1.2.4-2 MSTI Mapping

This section is used to map VLAN’s to MSTI’s when using the MSTP protocol. MSTP enables the

grouping and mapping of VLANs to different spanning tree instances. So, an MST Instance (MSTI) is a

particular set of VLANs that are all using the same spanning tree.

In a network where all VLANs span all links of the network, judicious choice of bridge priorities for

different MSTIs can result in different switches becoming root bridges for different MSTIs. That will

result in the different MSTIs choosing different active topologies on the network.

Multiple VLAN’s can be mapped to a single MSTI, when entering multiple VLAN ID’s, they need to be

separated using a comma. An unused MSTI should be left blank, do not enter VLAN ID’s into unused

MSTI’s.

Web Interface

To configure the MSTI Mapping’s for MSTP via the Web Interface:

1. Click Configuration, Spanning Tree and MSTI Mapping.

2. Give the configuration a name.

3. Enter the required VLAN’s into the configured MSTI(s).

4. Click the Apply button to save your changes or the Reset button to revert to previous

settings.

Fig. 38 MSTI Mappings