168 CHAPTER 14: MSTP CONFIGURATIONn In a network containing switches with both GVRP and MSTP enabled, GVRPpackets are forwarded along the CIST. In this case, if you want to broadcastpackets of a specific VLAN through GVRP, be sure to map the VLAN to the CISTwhen configuring the MSTP VLAN mapping table (the CIST of a network isspanning tree instance 0).ConfigurationPrerequisitesThe role (root, branch, or leaf) of each switch in each spanning tree instance isdetermined.Configuring the MSTRegionRefer to “Configuring an MST Region” on page 155.Configuring the Mode aPort Recognizes andSends MSTP PacketsRefer to “Configuring the Mode a Port Recognizes and Sends MSTP Packets” onpage 158.Configuring the TimeoutTime FactorRefer to “Configuring the Timeout Time Factor” on page 162.Configuring theMaximum TransmittingSpeed on the CurrentPortRefer to “Configuring the Maximum Transmitting Speed on the Current Port” onpage 163.Configuring a Port as anEdge PortRefer to “Configuring the Current Port as an Edge Port” on page 164.Configuring the PathCost for a PortThe path cost parameter reflects the rate of the link connected to the port. For aport on an MSTP-enabled switch, the path cost may be different in differentspanning tree instances. You can enable flows of different VLANs to travel alongdifferent physical links by configuring appropriate path costs on ports, so thatVLAN-based load balancing can be implemented.Path cost of a port can be determined by the switch or through manualconfiguration.Configure the current port asan edge portOptional “Configuring the Current Portas an Edge Port”Configure the path cost for aportOptional “Configuring the Path Costfor a Port”Configure the port priority Optional “Configuring Port Priority”Specify whether the linkconnected to a port ispoint-to-point linkOptional “Specifying Whether the LinkConnected to a Port IsPoint-to-point Link”Table 121 Configure leaf nodesOperation Description Related section
