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IEEE 48-bit EUI (MAC address) logic.
Supports numerous MAC string formats including Cisco's triple hextet as well
as bare MACs containing no delimiters.
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@param addr: An IEEE EUI-48 (MAC) address in string form.
@return: C{True} if MAC address string is valid, C{False} otherwise.
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@param addr: An IEEE EUI-48 (MAC) address in string form.
@return: An unsigned integer that is equivalent to value represented
by EUI-48/MAC string address formatted according to the dialect
settings.
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@param int_val: An unsigned integer.
@param dialect: (optional) a Python class defining formatting options.
@return: An IEEE EUI-48 (MAC) address string that is equivalent to
unsigned integer formatted according to the dialect settings.
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@param int_val: the integer to be packed.
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@param packed_int: a packed string containing an unsigned integer.
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@return: An unsigned integer equivalent to value of network address
represented by packed binary string.
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