VPLS OAM Because VPLS instances are built from a mesh of pseudowires interconnecting
virtual switching instances, the key tools for VPLS OAM are the pseudowire
OAM tools (e.g., VCCV) and Ethernet OAM tools.
Pseudowire OAM enables providers to verify that the pseudowires that interconnect
VPLS instances are operating correctly. However, pseudowire OAM tools do not verify
that a pseudowire is connected to the correct VPLS instance or that packets destined
to a specific MAC address are forwarded correctly in the VPLS instance.
Ethernet OAM is still in its infancy. The IEEE has specified both link-layer OAM
(802.3ah) and service-layer OAM (802.1ag Connectivity Fault Management). The ITU-T
has also standardised Y.1731??”a variant of 802.1ag. The MEF is standardising an
Ethernet LMI that enables a PE to inform a CE of the available VLANs on the UNI
and to report the status of those VLANs. When troubleshooting a VPLS service, the
Ethernet OAM tools may be most useful for troubleshooting the portion outside the
service provider??™s MPLS domain (and, of course, are generally the only tools available
for troubleshooting that portion of the service).
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