You can specify the maintenance domain name format as plain ASCII character string, domain name service (DNS) format, MAC address plus a two-octet identifier in the range from 0 through 65,535, or none. If none is specified, the maintenance domain name is not used. The default name format is ASCII character string
To configure the maintenance domain name format, include the name-format (character-string | none | dns | mac+2octet) statement at the [edit protocols oam ethernet connectivity-fault-management maintenance-domain domain-name] hierarchy level.