ZyXEL NetAtlas User Guide - Page 304
Loop Guard
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Chapter 20 Advanced Configuration Table 154 Advanced Configuration > Static MAC Forward > New EPON Static MAC Forward LABEL DESCRIPTION Logical Link Select the number of the logical link on the ONU. Index MAC Enter the MAC address in valid MAC address format, that is, six hexadecimal character pairs. Static MAC addresses do not age out. OK Click OK to save the settings. Close Click Close to exit the screen. All unsaved settings will be lost. 20.6 Loop Guard Loop guard allows you to configure the OLT to shut down a port if it detects that packets sent out on that port loop back to the OLT. While you can use Spanning Tree Protocol (STP) to prevent loops in the core of your network. STP cannot prevent loops that occur on the edge of your network. Figure 190 Loop Guard vs STP STP Loop Guard Note: The loop guard feature can not be enabled on the ports that have Spanning Tree Protocol (RSTP, MRSTP or MSTP) enabled. 304 NetAtlas EPON Manager User's Guide