CANOGA PERKINS 9155 Network Interface Device - Manual (Page 29)

Table 6. STNP Settings Screen Options
Option Description
SNTP Enable: Enable (yes) or disable (no) synchronized time
SNTP Server IP Address: Enter the address for the server
Time Resync Interval in hours: Set how often, in hours, that the 9155 tries to synchronize its
time to the SNTP server; Range is 0 (attempt to synchronize
at 9155 bootup, only) to 24 (once daily)
Offset from GMT in hours: Set the difference, in hours, between this 9155 and
Greenwich Mean Time (GMT); Range is -12 to 12
Summertime: Enable (yes) or disable (no) Daylight Saving Time
4.6 Switch Configuration
The Switch Configuration menu offers options to set network parameters; see Figure 19 and Table 7.
SWITCH CONFIGURATION
1. Global Spanning Tree Parameters
2. Multiple Spanning Tree Parameters
3. Global Spanning Tree Report
4. Lag Configuration
5. VLAN Configuration
6. GVRP Configuration
7. Main Menu
Figure 19. Switch Configuration Menu
Table 7. Spanning Tree Parameters Options
Menu Item Description
1. Global Spanning Tree Parameters Set the network-wide parameters
2. Multiple Spanning Tree Parameters Set and view Multiple Spanning Tree instances
3. Global Spanning Tree Report View current network-wide parameters
4. Lag Configuration View the current information for the network and port
5. VLAN Configuration Set the VLAN parameters
6. GVRP Configuration Set the GVRP parameters
Ethernet bridges or switches use the Spanning Tree Protocol (STP), an algorithm that creates a logical
topology that connects all network segments and ensures only one path between any two stations.
When STP is enabled, the 9155 monitors the incoming data packets and periodically sends Bridge
Protocol Data Units (BPDU). STP monitors the incoming BPDUs to detect any loops. If the same
BPDU arrives on two ports, STP blocks one port to remove the loop. Because this tree-like structure
spans all nodes in the network, it is called Spanning Tree. Figure 20 shows a typical STP application.
9155 Network Interface Device 4-13