IS-IS - CLNS ADDRESSING

CLNS addressing structure, how a NET addresses is built for integrated ISIS and the two most common ways to structure a NET address (using loopbacks and mac)

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Fields:
AFI (0-1 byte): determines the authority that assigned the address (49 = private addressing). If the area field is only 1 byte, the AFI field won't be used, resulting on a NET address of 8 bytes
Area (1-2 bytes): identifies the area that the system belongs to. If 2 bytes are used, we need to use the AFI field. 
System ID (6 bytes): identifies an OSI device.
NSEL (1 byte): always 0, indicates that the address is for the use of the device. 

Example:
49.0001.0000.0c12.3456.00

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