Netgear GS728TXS GS728TXS/GS752TXS Software Administration Manual - Page 311

GS752TXS and GS728TXS Smart Switches 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 can 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. Sample MSTP Configuration This example shows how to create an MSTP instance from the GS752TXS/GS728TXS switch. The example network has three different GS752TXS/GS728TXS switches that serve different locations in the network. In this example, ports g1-g5 are connected to host stations, so those links are not subject to network loops. Ports g6-g8 are connected across switches 1, 2, and 3. Ports g1-g5 Connected to Hosts Ports g1-g5 Connected to Hosts Ports g6-g8 Connected to Switch 2 and 3 Switch 1 Root Bridge Switch 2 Ports g6-g8 Connected to Switch 1 and 2 Ports g1-g5 Connected to Hosts Switch 3 Perform the following procedures on each switch to configure MSTP: 1. Use the VLAN Configuration screen to create VLANs 300 and 500 (see Basic VLAN Configuration on page 103). 2. Use the VLAN Membership screen to include ports g1-g8 as tagged (T) or untagged (U) members of VLAN 300 and VLAN 500 (see VLAN Membership Configuration on page 104). 3. From the STP Configuration screen, enable the Spanning Tree State option (see STP Configuration on page 118). 311