D-Link DGS-1520 User Manual - Page 177

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Web UI Reference Guide Parameter Cost Priority Description After clicking the Edit button, enter the cost value here. This value must be between 1 and 200000000. After clicking the Edit button, select the priority value here. Options to choose from are 0 to 240. By default, this value is 128. A lower value has higher priority. Click the Clear Detected Protocol button to clear the detected protocol settings for the port selected. Click the Find button to locate a specific entry based on the information entered. Click the Edit button to re-configure the specific entry. Enter a page number and click the Go button to navigate to a specific page when multiple pages exist. ERPS (G.8032) Ethernet Ring Protection Switching (ERPS) (ITU-T G.8032) integrates mature Ethernet Operations, Administration, and Maintenance (OAM) functions and a simple Automatic Protection Switching (APS) protocol to provide sub-50ms protection for Ethernet traffic in a ring topology. It ensures that there are no loops formed at the Ethernet layer. One link within a ring will be blocked to avoid a Loop (RPL, Ring Protection Link). When the failure happens, protection switching blocks the failed link and unblocks the RPL. When the failure clears, protection switching blocks the RPL again and unblocks the link on which the failure is cleared. ERPS This window is used to display and configure the Ethernet Ring Protection Switching (ERPS) settings. STP and Loopback Detection (LBD) should be disabled on the ring ports before enabling ERPS. The ERPS cannot be enabled before the R-APS VLAN ring ports, RPL port, and RPL owner are configured. NOTE: Be aware that changing the ERPS version will lead to the restart of the running protocol. To view the following window, click L2 Features > ERPS (G.8032) > ERPS and select the ERPS Status tab, as shown below: Figure 5-59 ERPS Window 167