Chapter 39 Diagnostic
VMG3925-B10C/B30C User’s Guide
276
39.5 802.3ah
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 166 Maintenance > Diagnostic > 802.3ah
CCM Select Enable to continue sending MEP information by CCM (Connectivity Check Messages).
When CCMs are received the VMG will always process it, no matter if CCM is enabled or not.
Remote MEP ID Enter the remote Maintenance Endpoint Identifier (1~8191).
Test the connection to another Maintenance End Point (MEP)
Destination
MAC Address
Enter the target device’s MAC address to which the VMG performs a CFM loopback and
linktrace test.
Test Result
Loopback
Message (LBM)
This shows Pass if a Loop Back Messages (LBMs) responses are received. If LBMs do not get a
response it shows Fail.
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 124 Maintenance > Diagnostic > 802.1ag (continued)
LABEL DESCRIPTION
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