Foundry NetIron M2404C and M2404F Metro Access Switches
Network Administration Tools (Rev. 03)
Intermediate 802.3ah EFM OAM
© 2008 Foundry Networks, Inc.
Page 56 of 155
Figure 10: Managing Customer Switches (passive) using the EFM 802.3ah Standard
The next configuration illustrates management and monitoring (testing) of a virtual link and virtual
pseudo-wire between two CE devices:
Figure 11: Using 802.3ah over Virtual Ethernet Links
EFM- OAM Protocol Functionality
The functionality of the OAM-EFM can be summarized under the following categories:
•
Discovery:
Discovers is the mechanism to detect the presence of an OAM sublayer on the
remote device. During the discovery process, information about OAM entities, capabilities and
configuration are exchanged
•
Link monitoring:
This process is used to detect link faults and to provide information about the
number of frame errors and coding symbol errors.
•
Remote fault detection:
Provides a mechanism for an OAM entity to convey error conditions to
its peer via a flag in the OAMPDUs.
•
Remote loopback:
This mechanism is used to troubleshoot networks and to isolate problem
segments in a large network by sending test segments.
•
MIB variable retrieval:
It is used to get information from a management information base.
•
Organizing specific enhancements:
Provide vendor-specific enhancements to the protocol.