Netgear GS418TPP User Manual - Page 162

ProSAFE 8-Port or 16-Port Gigabit Smart Managed Switch Model GS418TPP, GS510TLP, and GS510TPP implementing a topological change. The valid range is 6-40, and the value must be less than or equal to (2 * Bridge Forward Delay) - 1 and greater than or equal to 2 * (Bridge Hello Time +1). The default value is 20. • Bridge Hello Time (secs). The bridge hello time for the Common and Internal Spanning Tree (CST), which indicates the time in seconds a root bridge must wait between configuration messages. The value is fixed at 2 seconds. The value must be less than or equal to (Bridge Max Age / 2) - 1. The default hello time value is 2. • Bridge Forward Delay (secs). The bridge forward delay time, which indicates the time in seconds a bridge must remains in a listening and learning state before forwarding packets. The value must be greater or equal to (Bridge Max Age / 2) + 1. The time range is from 4 seconds to 30 seconds. The default value is 15 seconds. • Spanning Tree Maximum Hops. The maximum number of bridge hops the information for a particular CST instance can travel before being discarded. The valid range is 6-40. The default is 20 hops. 7. Click the Apply button. The updated configuration is sent to the switch. Configuration changes take effect immediately. The following table describes the MSTP Status information that is displayed. Table 38. STP advanced CST configuration, MSTP status Field MST ID VID ID FID ID Description Table consisting of the MST instances (including the CST) and the corresponding VLAN IDs associated with each of them. Table consisting of the VLAN IDs and the corresponding FID associated with each of them. Table consisting of the FIDs and the corresponding VLAN IDs associated with each of them. Configure CST Port Settings You can configure a common spanning tree (CST) and internal spanning tree on a specific port on the switch. A port can become diagnostically disabled (D-Disable) when DOT1S experiences a severe error condition. The most common cause is when the DOT1S software experiences BPDU flooding. The flooding criteria are such that DOT1S receives more than 15 BPDUs in a 3-second interval. The other causes for DOT1S D-Disable are extremely rare.  To configure CST port settings: 1. Connect your computer to the same network as the switch. You can use a WiFi or wired connection to connect your computer to the network, or connect directly to a switch that is off-network using an Ethernet cable. Configure Switching 162