ZyXEL NetAtlas User Guide - Page 181

Chapter 14 Switch Configuration 14.5.4 Configuring an MST Instance To create a new MST instance, click New... in the Switch Configuration > STP: MSTP screen. Click Modify... to change the settings of the MST instance. The New MST Instance or Modify MST Instance screen displays. Figure 118 Switch Configuration > STP: MSTP > New The following table describes the labels in this screen. Table 88 Switch Configuration > STP: MSTP > New LABEL DESCRIPTION MST Instance Select the number you want to use to identify this MST instance on the device. Bridge Priority Select the priority of the device for the specific spanning tree instance. The lower the number, the more likely the device will be chosen as the root bridge within the spanning tree instance. Enable VLAN This field displays which VLAN(s) are mapped to this MST instance. Set... Click Set.. to open a screen where you can configure the range of VLAN(s) to be mapped to the MST instance. Port This field displays the Ethernet port number. Enable Select this check box to add this port to the MST instance. Priority Configure the priority for each port here. Path Cost OK Cancel Priority decides which port should be disabled when more than one port forms a loop in a switch. Ports with a higher priority numeric value are disabled first. The allowed range is between 0 and 255 and the default value is 128. Path cost is the cost of transmitting a frame on to a LAN through that port. It is recommended to assign this value according to the speed of the bridge. The slower the media, the higher the cost. Click OK to save the changes and close this screen. Click Cancel to close this screen. All unsaved changes will be lost. NetAtlas EPON Manager User's Guide 181