Netgear XSM4348CS User Manual - Page 710

M4300 Intelligent Edge Series Fully Managed Stackable Switches and only one MSTI or CIST). For example, port A can be forwarding for instance 1 while discarding for instance 2. The port states changed since IEEE 802.1D specification. To support multiple spanning trees, a MSTP bridge must be configured with an unambiguous assignment of VLAN IDs (VIDs) to spanning trees. This is achieved by: 1. Ensuring that the allocation of VIDs to FIDs is unambiguous. 2. Ensuring that each FID 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 a MSTID of 0. An instance might occur that has no VIDs allocated to it, 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 on 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 710 User Manual