Lantronix
SM12XPA Web User Guide
33848 Rev. A
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MEP
Configure CFM MEP (Maintenance Entity Point) parameters on this page. This switch supports two types of
MEPs: Port Down-MEPs and VLAN Down-MEPs:
Port Down-MEPs
: In 802.1Q terminology, Port MEPs are located below the EISS entity (i.e., closest to
the physical port). Port MEPs are used by, for example, APS for protection purposes. Port MEPs are
created when the encompassing service has type "Port". Port MEPs may send OAM PDUs tagged or
untagged. An OAM PDU will be sent untagged only if the MEP's VLAN is set to "Inherit" (0). Any other
value will cause it to be sent tagged with the port's TPID, whether the VLAN matches the port's PVID and
that PVID is meant to be sent untagged.
VLAN Down-MEPs
: In 802.1Q terminology, VLAN MEPs are located above the EISS (Enhanced Internal
Sub-layer Service) entity. This means that tagging of OAM PDUs will follow the port's VLAN
configuration. Thus, if a VLAN MEP is created on the Port's PVID and PVID is configured to be untagged,
OAM PDUs will be transmitted untagged. VLAN MEPs are created when the encompassing service has
type "VLAN".
Down-MEP creation rules
:
There are a few rules for creating Down-MEPs:
1.
There can only be one Port MEP on the same port.
2.
There can only be one VLAN MEP on the same port and VLAN.
3.
A VLAN MEP must have a higher MD/MEG level than a Port MEP on the same port and VLAN.
These checks are performed automatically on administratively enabled MEPs when you change a particular
MEP, change the Service Type from Port to VLAN or vice versa, or change the domain's MD/MEG level.
Figure 13-4: CFM Mep Configuration
Parameter descriptions
:
Delete
: Check to delete the entry. It will be deleted during the next save.
Domain
: The name of Domain under which this MEP resides.
Service
: The name of Service under which this MEP resides.
MEPID
: The identification of this MEP. Must be an integer [1..8091]
Direction
: Set whether this MEP is an Up-MEP or a Down-MEP.
Port
: Port on which this MEP resides.
VLAN
: VLAN ID. Use the value 0 to indicate untagged traffic (implies a port MEP).