You can create maintenance domains (MDs), or domains, and assign a unique MD level at that time. Available MD levels are numbered from 0 to 7. Higher numerical values are superior MD levels in the CFM hierarchy. Each switch can have a total of eight domains, each with a unique MD level.
Simple string—Use an alphanumeric character string with a maximum of 43 characters.
Domain name server (DNS) name—Use an alphanumeric character string with a maximum of 43 characters.
MAC address plus 2-octet integer—Use a MAC address and a 2-octet integer. The display format is XX.XX.XX.XX.XX.XX.YYY, where X is the MAC address, and Y is the 2-octet integer. For example, a domain name in this format using 123 as the 16-bit unsigned integer appears as follows: 00:11:22:33:44:55.123.
NoteWhatever convention you choose, you must use that same format throughout the entire domain.
The CFM messages carry the domain name, so the name and naming format must be identical to be understood throughout the domain. You can, however, use different naming conventions on different domains on one switch (up to eight domains allowed on one switch). User-created CFM names are not case sensitive.