phys-address
Pattern:
'([0-9a-fA-F]{2}(:[0-9a-fA-F]{2})*)?'
Represents media- or physical-level addresses represented as a sequence octets, each octet represented by two hexadecimal numbers. Octets are separated by colons. The canonical representation uses lowercase characters. In the value set and its semantics, this type is equivalent to the PhysAddress textual convention of the SMIv2.
Reference:
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RFC 2579: Textual Conventions for SMIv2