Lantronix SISPM1040-xxxx-L3 Web User Guide
33856 Rev. A https://www.lantronix.com/ 288
CFM > Domain
Configure CFM Domain parameters on this page.
Delete: Check to delete the entry. It will be deleted during the next save.
Domain: Name of Domain. Value is a single word which begins with an alphabetic letter A-Z or a-z with a length
of 1-15 characters.
Format: Select the MD name format. To mimic Y.1731 MEG IDs, use type None.
None: If format is None: Name is not used but will be set to all-zeros behind the scenes. This format is
typically used by Y.1731-kind-of-PDUs.
String: If format is String, the Name must contain a string 1-43 characters long.
Name: The contents of this parameter depend on the value of the format member.
Level: MD/MEG level of this domain. Valid values are 0 - 7.
About leak prevention: Leak prevention is about discarding OAM PDUs with MEG levels lower than the MEP they
hit when the OAM PDUs are ingressing the port on which the MEP resides, and to discard OAM PDUs with MEG
levels at or lower than the MEP's when the OAM PDUs are ingressing other ports.
There are two categories of architectures, when it comes to leak-prevention: Those that use Shared MEG level
and those that use Independent MEG level:
Shared MEG level: On Shared MEG level architectures, Port Down MEPs always perform level filtering no matter
which VLAN ID (VID) OAM PDUs get classified to, unless the same port has a VLAN MEP on the VID in question.
So if you have a Port MEP in VID X and a VLAN MEP in VID Y, an OAM frame arriving on the port and gets
classified to VID X or VID Z will be handled/level-filtered by the Port MEP, whereas an OAM frame ingressing the
port in VID Y will be handled by the VLAN MEP. Likewise, if the switch has a Port MEP on VID X on Port X and
an OAM frame ingresses on VID Y on Port Y, it is subject to level filtering before egressing Port X, unless Port X
also has a VLAN MEP on VID Y, in which case the VLAN MEP will take care of level-filtering the OAM PDU.
On Shared MEG level architectures, all Port MEPs must have the same MEG level and any VLAN MEP must
have a MEG level higher than the Port MEPs' MEG level.
Independent MEG level: On Independent MEG level architectures, Port Down MEPs never perform level filtering
on frames not classified to the MEP's VID. So if you have a Port MEP on VID X and a VLAN MEP on VID Y and
an OAM frame ingresses any port on VID Z, it is not subject to handling/level-filtering by either of the two MEPs.
This switch exhibits Independent MEG level.
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