Lantronix
SM12XPA Web User Guide
33848 Rev. A
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Domain
Configure CFM Domain parameters on this page. Ethernet Connectivity Fault Management (CFM per IEEE
802.1ag) is an end-to-end Ethernet OAM that can cross multiple domains to monitor the health of the entire
service instance.
Figure 13-2: CFM Domain Configuration
Parameter descriptions
:
Delete
: Check to delete the entry. It will be deleted during the next save.
Domain
: Name of the Domain. The value is a single word which begins with an alphabetic letter A-Z or a-z with
a length of 1-15 letters.
Format
: Select the MD name format.
None
: Select to mimic ITU-T Y.1731 MEG IDs (contains only the MEG ID).
String
: Select to mimic 802.1ag format (contains both MD and MA names).
Name
: The contents of this parameter depend on the value of the format member. If format is None then
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. If format is String, then the Name must contain a string 1 - 43 characters long.
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.
