4.4.2 CFM-Domain Configuration

Configure CFM Domain parameters on the CFM Domain Configuration page, as shown in the following figure.

Figure 4-19. CFM Domain Configuration

The CFM Domain Configuration page has the following parameters:

  • Delete: Check to delete the entry. It is 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 length 1–15.
  • Format: Select the MD name format. To mimic Y.1731 MEG IDs, use type None.
    • None
    • String
  • Name: The contents of this parameter depend on the value of the format member.
    • None: Name is not used but is set to all-zeros behind the scenes. This format is typically used by Y.1731-kind-of-PDUs.
    • String: the name must contain a string from 1–43 characters long.
  • Level: MD/MEG level of this domain. Valid values are restricted to 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 any of the two MEPs.
      Note: This switch exhibits Shared MEG level.
  • TLV Option Select:
    • Sender Id: Default Sender ID TLV format to be used in CCMs generated by this domain (may be overridden in service).
      • None: Do not include Sender ID TLVs
      • Chassis: Enable Sender ID TLV and send Chassis ID (MAC Address)
      • Manage: Enable Sender ID TLV and send Management address (IPv4 Address)
      • Chassis Manage: Enable Sender ID TLV and send both Chassis ID (MAC Address) and Management Address (IPv4 Address)
      • Defer: Let the global configuration decide if Sender ID TLVs are included (may be overridden in service)
    • Port Status: Include or exclude Port Status TLV in CCMs generated by this Domain or let higher level determine (may be overridden in Service)
      • Disable: Do not include Port Status TLVs
      • Enable: Include Port Status TLVs
      • Defer: Let the global configuration decide if Port Status TLVs are included (may be overridden in Service)
    • Interface Status: Include or exclude Interface Status TLV in CCMs generated by this Domain or let higher level determine (may be overridden in Service)
      • Disable: Do not include Interface Status TLVs
      • Enable: Include Interface Status TLVs
      • Defer: Let the global configuration decide if Interface Status TLVs are included (may be overridden in Service)
    • Org. Specific: Exclude Organization-Specific TLV in CCMs generated by this Domain or let higher level determine (may be overridden in Service)
      • Disable: Do not include Organization-Specific TLVs
      • Defer: Let the global configuration decide if Organization-Specific TLVs are included (may be overridden in Service)