ZyXEL VMG4927-B50A User Guide - Page 277
OAM Ping
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Chapter 37 Diagnostic Table 133 Maintenance > Diagnostics > 802.3ah LABEL DESCRIPTION OAM ID Auto Event Features Enter a positive integer to identify this node. Select Enable for the VMG to detect link status and send a notification when an error (such as errors in symbol, frames, or seconds) is detected. Otherwise, click Disable and you will not be notified. Select Variable Retrieval so the VMG can respond to requests for information, such as requests for Ethernet counters and statistics, about link events. Select Link Events so the VMG can interpret link events, such as link fault and dying asp.Link events are set in event notification PDUs (Protocol Data Units), and indicate when the number of errors in a certain given interval (time, number of frames, number of symbols, or number of errored frame seconds) exceeds a specified threshold. Organizations may create organization-specific link event TLVs as well. Select Remote Loopback so the VMG can accept loopback control PDUs to convert VMG into loopback mode. Apply Select Active Mode so the VMG initiates OAM discovery, send information PDUs; and may send event notification PDUs, variable request/response PDUs, or loopback control PDUs. Click this button to save your changes. 37.6 OAM Ping Click Maintenance > Diagnostic > OAM Ping to open the screen shown next. Use this screen to perform an OAM (Operation, Administration and Maintenance) F4 or F5 loopback test on a PVC. The VMG sends an OAM F4 or F5 packet to the DSLAM or ATM switch and then returns it to the VMG. The test result then displays in the text box. ATM sets up virtual circuits over which end systems communicate. The terminology for virtual circuits is as follows: • Virtual Channel (VC) • Virtual Path (VP) • Virtual Circuits Logical connections between ATM devices A bundle of virtual channels A series of virtual paths between circuit end points Figure 173 Virtual Circuit Topology Think of a virtual path as a cable that contains a bundle of wires. The cable connects two points and wires within the cable provide individual circuits between the two points. In an ATM cell header, a VPI (Virtual Path Identifier) identifies a link formed by a virtual path; a VCI (Virtual Channel Identifier) identifies a channel within a virtual path. A series of virtual paths make up a virtual circuit. VMG4927-B50A / VMG9827-B50A User's Guide 277