Netgear GS418TPP User Manual - Page 442

ProSAFE 8-Port or 16-Port Gigabit Smart Managed Switch Model GS418TPP, GS510TLP, and GS510TPP To support multiple spanning trees, configure an MSTP bridge with an unambiguous assignment of VLAN IDs (VIDs) to spanning trees. For such a configuration, ensure the following: 1. The allocation of VIDs to FIDs is unambiguous. 2. Each FID that is supported by the bridge is allocated to exactly one spanning tree instance. The combination of VID to FID and then FID to MSTI allocation defines a mapping of VIDs to spanning tree instances, represented by the MST Configuration Table. With this allocation we ensure that every VLAN is assigned to one and only one MSTI. The CIST is also an instance of spanning tree with an MSTID of 0. VIDs might be not be allocated to an instance, but every VLAN must be allocated to one of the other instances of spanning tree. The portion of the active topology of the network that connects any two bridges in the same MST region traverses only MST bridges and LANs in that region, and never bridges of any kind outside the region. In other words, connectivity within the region is independent of external connectivity. MSTP Example Configuration This example shows how to create an MSTP instance from the switch. The example network includes three different switches that serve different locations in the network. In this example, ports 1/0/1-1/0/5 are connected to host stations, so those links are not subject to network loops. Ports 1/0/6-1/0/8 are connected across switches 1, 2, and 3. Figure 2. MSTP sample configuration Configuration Examples 442