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Chapter 42 Diagnostic
VMG8825-B Series User’s Guide
304
42.5 802.3ah
Click Maintenance > Diagnostic > 803.ah to open the following screen. Use this screen to the link
monitoring protocol IEEE 802.3ah Link Layer Ethernet OAM (Operations, Administration and
Maintenance.
Link layer Ethernet OAM (Operations, Administration and Maintenance) as described in IEEE 802.3ah is a
link monitoring protocol. It utilizes OAM Protocol Data Units or OAM PDU’s to transmit link status
information between directly connected Ethernet devices. Both devices must support IEEE 802.3ah.
Because link layer Ethernet OAM operates at layer two of the OSI (Open Systems Interconnection Basic
Reference) model, neither IP or SNMP are necessary to monitor or troubleshoot network connection
problems.
Figure 191 Maintenance > Diagnostic > 802.3ah
The following table describes the labels on this screen.
Linktrace
Message (LTM) This shows the MAC address of MEPs that respond to the LTMs.
Apply Click this button to save your changes.
Send Loopback Click this button to have the selected MEP send the LBM (Loop Back Message) to a specified
remote end point.
Send Linktrace Click this button to have the selected MEP send the LTMs (Link Trace Messages) to a specified
remote end point.
Table 146 Maintenance > Diagnostic > 802.1ag (continued)
LABEL DESCRIPTION
Table 147 Maintenance > Diagnostics > 802.3ah
LABEL DESCRIPTION
IEEE 802.3ah Ethernet OAM Select Enable or Disable to activate or deactivate the Ethernet OAM on the
specified interface.
Interface Select the interface on which you want to enable the IEEE802.3ah.
OAM ID Enter a positive integer to identify this node.
Auto Event 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.